diff --git a/packages/@aws-cdk/assert/lib/expect.ts b/packages/@aws-cdk/assert/lib/expect.ts
index 9fca81ff8e2f3..d59d1b6f02ccc 100644
--- a/packages/@aws-cdk/assert/lib/expect.ts
+++ b/packages/@aws-cdk/assert/lib/expect.ts
@@ -1,9 +1,12 @@
 import cdk = require('@aws-cdk/cdk');
-import { ConstructNode, ConstructOrder } from '@aws-cdk/cdk';
+import { ConstructNode, ConstructOrder, FileSystemStore } from '@aws-cdk/cdk';
 import api = require('@aws-cdk/cx-api');
 import { StackInspector } from './inspector';
 import { SynthUtils } from './synth-utils';
 
+import fs = require('fs');
+import os = require('os');
+
 export function expect(stack: api.SynthesizedStack | cdk.Stack, skipValidation = false): StackInspector {
   // Can't use 'instanceof' here, that breaks if we have multiple copies
   // of this library.
@@ -11,17 +14,19 @@ export function expect(stack: api.SynthesizedStack | cdk.Stack, skipValidation =
 
   if (cdk.Stack.isStack(stack)) {
     const session = SynthUtils.synthesize(stack, {
+      store: new FileSystemStore({
+        path: fs.mkdtempSync(os.tmpdir())
+      }),
       skipValidation
     });
 
     sstack = {
       name: stack.name,
       template: SynthUtils.templateForStackName(session, stack.name),
-      metadata: collectStackMetadata(stack.node),
-      environment: {
-        name: 'test',
-        account: 'test',
-        region: 'test'
+      artifact: {
+        metadata: collectStackMetadata(stack.node),
+        type: api.ArtifactType.AwsCloudFormationStack,
+        environment: 'aws://test/test'
       }
     };
   } else {
diff --git a/packages/@aws-cdk/assert/lib/inspector.ts b/packages/@aws-cdk/assert/lib/inspector.ts
index d5e3315bc80ed..2cede22c2d66e 100644
--- a/packages/@aws-cdk/assert/lib/inspector.ts
+++ b/packages/@aws-cdk/assert/lib/inspector.ts
@@ -54,9 +54,12 @@ export class StackPathInspector extends Inspector {
     // The names of paths in metadata in tests are very ill-defined. Try with the full path first,
     // then try with the stack name preprended for backwards compat with most tests that happen to give
     // their stack an ID that's the same as the stack name.
-    const md = this.stack.metadata[this.path] || this.stack.metadata[`/${this.stack.name}${this.path}`];
+    if (this.stack.artifact.metadata === undefined) {
+      return undefined;
+    }
+    const md = this.stack.artifact.metadata[this.path] || this.stack.artifact.metadata[`/${this.stack.name}${this.path}`];
     if (md === undefined) { return undefined; }
-    const resourceMd = md.find(entry => entry.type === 'aws:cdk:logicalId');
+    const resourceMd = md.find((entry: any) => entry.type === 'aws:cdk:logicalId');
     if (resourceMd === undefined) { return undefined; }
     const logicalId = resourceMd.data;
     return this.stack.template.Resources[logicalId];
diff --git a/packages/@aws-cdk/assert/lib/synth-utils.ts b/packages/@aws-cdk/assert/lib/synth-utils.ts
index 2d3e1d237dfff..c85e6fc1b48c5 100644
--- a/packages/@aws-cdk/assert/lib/synth-utils.ts
+++ b/packages/@aws-cdk/assert/lib/synth-utils.ts
@@ -1,13 +1,13 @@
 import { ISynthesisSession, Stack, SynthesisOptions, Synthesizer } from '@aws-cdk/cdk';
 
 export class SynthUtils {
-  public static toCloudFormation(stack: Stack, options: SynthesisOptions = { }): any {
+  public static toCloudFormation(stack: Stack, options: SynthesisOptions): any {
     const session = this.synthesize(stack, options);
     return this.templateForStackName(session, stack.name);
   }
 
   public static templateForStackName(session: ISynthesisSession, stackName: string): any {
-    return session.store.readJson(session.getArtifact(stackName).properties!.templateFile);
+    return session.assembly.readJson(session.getArtifact(stackName).properties!.templateFile);
   }
 
   public static synthesize(stack: Stack, options: SynthesisOptions): ISynthesisSession {
diff --git a/packages/@aws-cdk/assert/test/test.assertions.ts b/packages/@aws-cdk/assert/test/test.assertions.ts
index c59a96114e6e0..960927bf66080 100644
--- a/packages/@aws-cdk/assert/test/test.assertions.ts
+++ b/packages/@aws-cdk/assert/test/test.assertions.ts
@@ -42,7 +42,12 @@ passingExample('expect <synthStack> to match (exactly) <template>', () => {
   });
   const expected = {
     Resources: {
-      TestResource: { Type: resourceType }
+      TestResource: {
+        Type: resourceType,
+        Metadata: {
+          "aws:cdk:path": "TestStack/TestResource"
+        }
+      }
     }
   };
   expect(synthStack).to(matchTemplate(expected, MatchStyle.EXACT));
@@ -66,8 +71,19 @@ passingExample('expect <synthStack> to be a superset of <template>', () => {
   });
   const expected = {
     Resources: {
-      TestResourceA: { Type: 'Test::Resource' },
-      TestResourceB: { Type: 'Test::Resource', Properties: { Foo: 'Bar' } }
+      TestResourceA: {
+        Type: 'Test::Resource',
+        Metadata: {
+          "aws:cdk:path": "TestStack/TestResourceA"
+        }
+      },
+      TestResourceB: {
+        Type: 'Test::Resource',
+        Metadata: {
+          "aws:cdk:path": "TestStack/TestResourceB"
+        },
+        Properties: { Foo: 'Bar' }
+      }
     }
   };
   expect(synthStack).to(matchTemplate(expected, MatchStyle.SUPERSET));
@@ -206,10 +222,21 @@ function failingExample(title: string, cb: (test: Test) => void) {
 }
 
 function synthesizedStack(fn: (stack: cdk.Stack) => void): cx.SynthesizedStack {
-  const app = new cdk.App();
+  const app = new cdk.App({
+    context: {
+      [cx.PATH_METADATA_ENABLE_CONTEXT]: 'true'
+    }
+  });
   const stack = new cdk.Stack(app, 'TestStack');
   fn(stack);
-  return app.synthesizeStack(stack.name);
+  const session = app.run();
+  const artifact: cx.Artifact = session.manifest.artifacts![stack.name];
+  const template = session.assembly.readJson(artifact.properties!.templateFile);
+  return {
+    name: 'TestStack',
+    artifact,
+    template
+  };
 }
 
 interface TestResourceProps extends cdk.CfnResourceProps {
diff --git a/packages/@aws-cdk/assert/test/test.have-resource.ts b/packages/@aws-cdk/assert/test/test.have-resource.ts
index 888a8a3147b3d..e252bf22c67fb 100644
--- a/packages/@aws-cdk/assert/test/test.have-resource.ts
+++ b/packages/@aws-cdk/assert/test/test.have-resource.ts
@@ -1,3 +1,4 @@
+import { ArtifactType, SynthesizedStack } from '@aws-cdk/cx-api';
 import { Test } from 'nodeunit';
 import { expect, haveResource } from '../lib/index';
 
@@ -89,15 +90,14 @@ export = {
   },
 };
 
-function mkStack(template: any) {
+function mkStack(template: any): SynthesizedStack {
   return {
     name: 'test',
     template,
-    metadata: {},
-    environment: {
-      name: 'test',
-      account: 'test',
-      region: 'test'
+    artifact: {
+      type: ArtifactType.AwsCloudFormationStack,
+      metadata: {},
+      environment: 'aws://test/test'
     }
   };
 }
diff --git a/packages/@aws-cdk/assets/lib/artifact.ts b/packages/@aws-cdk/assets/lib/artifact.ts
new file mode 100644
index 0000000000000..5a9a353172536
--- /dev/null
+++ b/packages/@aws-cdk/assets/lib/artifact.ts
@@ -0,0 +1,218 @@
+import cdk = require('@aws-cdk/cdk');
+import cxapi = require('@aws-cdk/cx-api');
+import fs = require('fs');
+import path = require('path');
+import { AssetPackaging, GenericAssetProps } from './asset';
+import { copyDirectory } from './fs-copy';
+import { fingerprint } from './fs-fingerprint';
+
+export interface AssetArtifactProps extends GenericAssetProps {
+  fingerprint: string;
+}
+
+/**
+ * This is an internal construct (only available within this module) which represents a unique
+ * asset within the app.
+ *
+ * To get an instance, use `AssetArtifact.forAsset`. It will calculate the fingerprint
+ * of the asset based on content hash and look up if there is already an artifact with this
+ * fingerprint in the app.
+ */
+export class AssetArtifact extends cdk.Construct implements cdk.ISynthesizable {
+
+  /**
+   * @returns gets or creates a singletone asset artifact for a specific asset
+   */
+  public static forAsset(scope: cdk.Construct, props: GenericAssetProps): AssetArtifact {
+    const extra = {
+      packaging: props.packaging,
+      extra: props.extra,
+    };
+
+    const sourcePath = path.resolve(props.path);
+    validateAssetOnDisk(sourcePath, props.packaging);
+
+    // calculate content hash, which is what we use as the app-level ID of this asset
+    const fp = fingerprint(props.path, {
+      exclude: props.exclude,
+      follow: props.follow,
+      extra: JSON.stringify(extra)
+    });
+
+    const root = scope.node.root;
+
+    const id = `asset_${fp}`;
+    const artifact = root.node.tryFindChild(id) as AssetArtifact || new AssetArtifact(root, id, {
+      fingerprint: fp,
+      path: sourcePath,
+      ...props
+    });
+
+    return artifact;
+  }
+
+  /**
+   * The unique fingerprint of this asset, based MD5 hash of the content and the
+   * directory structure.
+   */
+  public readonly fingerprint: string;
+
+  private readonly artifactId: string;
+  private readonly environments = new Set<string>();
+
+  private constructor(scope: cdk.Construct, id: string, private readonly props: AssetArtifactProps) {
+    super(scope, id);
+
+    this.fingerprint = props.fingerprint;
+    this.artifactId = id; // based on the fingerprint
+  }
+
+  /**
+   * Creates (or reuses) the set of bucket/key parameters that will be used to wire assets
+   * into a specific stack. Called by the `Asset` class to "subscribe" the asset to the stack.
+   *
+   * @param stack
+   */
+  public wireToStack(stack: cdk.Stack): AssetArtifactParameters {
+    const bucketParamId = `asset-${this.fingerprint}-S3Bucket`;
+    const keyParamId = `asset-${this.fingerprint}-S3Key`;
+    const hashParamId = `asset-${this.fingerprint}-S3ContentHash`;
+
+    // if we already have a parameters wired for this asset, just return them (assuming they all exist)
+    if (stack.node.tryFindChild(keyParamId)) {
+      return {
+        bucket: stack.node.findChild(bucketParamId) as cdk.Parameter,
+        key: stack.node.findChild(keyParamId) as cdk.Parameter,
+        sha256: stack.node.findChild(hashParamId) as cdk.Parameter
+      };
+    }
+
+    // okay, "register" this asset with the stack. this includes adding a bunch of parameters
+    // and a metadata entry that tells the toolkit how to build the asset.
+
+    const bucketParam = new cdk.Parameter(stack, bucketParamId, {
+      type: 'String',
+      description: `S3 bucket for asset ${this.fingerprint} from ${this.props.path}`,
+    });
+
+    const keyParam = new cdk.Parameter(stack, keyParamId, {
+      type: 'String',
+      description: `S3 key for asset ${this.fingerprint} from ${this.props.path}`
+    });
+
+    const contentHashParam = new cdk.Parameter(stack, hashParamId, {
+      type: 'String',
+      description: 'SHA-256 hash of the asset as it was uploaded to S3'
+    });
+
+    stack.setParameterValue(bucketParam, `\${${this.artifactId}}.s3bucket`);
+    stack.setParameterValue(keyParam, `\${${this.artifactId}}.s3key`);
+    stack.setParameterValue(contentHashParam, `\${${this.artifactId}}.sha256`);
+
+    this.environments.add(stack.environment);
+
+    return {
+      bucket: bucketParam,
+      key: keyParam,
+      sha256: contentHashParam
+    };
+  }
+
+  public synthesize(session: cdk.ISynthesisSession) {
+
+    switch (this.props.packaging) {
+      case AssetPackaging.File:
+        this.synthesizeFile(session);
+        return;
+
+      case AssetPackaging.ZipDirectory:
+        this.synthesizeZipDirectory(session);
+        return;
+    }
+
+  }
+
+  private synthesizeFile(session: cdk.ISynthesisSession) {
+    const ext = path.extname(this.props.path);
+    const fileName = `${this.fingerprint}${ext}`;
+
+    const stagingFile = path.join(this.fingerprint, path.basename(this.props.path));
+
+    fs.mkdirSync(path.join(session.staging.path, this.fingerprint));
+    fs.copyFileSync(this.props.path, path.join(session.staging.path, stagingFile));
+
+    session.addBuildStep(this.artifactId, {
+      type: 'CopyFileTask',
+      parameters: {
+        src: `staging/${stagingFile}`,
+        dest: `assembly/${fileName}` // relative to outdir
+      }
+    });
+
+    for (const env of this.environments) {
+      session.addArtifact(this.artifactId, {
+        type: cxapi.ArtifactType.AwsS3Object,
+        environment: env,
+        properties: {
+          file: fileName // relative to assembly
+        }
+      });
+    }
+  }
+
+  private synthesizeZipDirectory(session: cdk.ISynthesisSession) {
+    const fileName = `${this.fingerprint}.zip`;
+
+    // copy source contents to a staging directory
+    const stagingDir = this.fingerprint;
+    fs.mkdirSync(path.join(session.staging.path, stagingDir));
+    copyDirectory(this.props.path, path.join(session.staging.path, stagingDir));
+
+    session.addBuildStep(this.artifactId, {
+      type: 'ZipDirectoryTask',
+      parameters: {
+        src: `staging/${stagingDir}`,
+        dest: `assembly/${fileName}`, // relative to outdir
+      }
+    });
+
+    for (const env of this.environments) {
+      session.addArtifact(this.artifactId, {
+        type: cxapi.ArtifactType.AwsS3Object,
+        environment: env,
+        properties: {
+          file: fileName // relative to assembly/
+        }
+      });
+    }
+  }
+}
+
+export interface AssetArtifactParameters {
+  bucket: cdk.Parameter;
+  key: cdk.Parameter;
+  sha256: cdk.Parameter;
+}
+
+function validateAssetOnDisk(assetPath: string, packaging: AssetPackaging) {
+  if (!fs.existsSync(assetPath)) {
+    throw new Error(`Cannot find asset at ${assetPath}`);
+  }
+
+  switch (packaging) {
+    case AssetPackaging.ZipDirectory:
+      if (!fs.statSync(assetPath).isDirectory()) {
+        throw new Error(`${assetPath} is expected to be a directory when asset packaging is 'zip'`);
+      }
+      break;
+
+    case AssetPackaging.File:
+      if (!fs.statSync(assetPath).isFile()) {
+        throw new Error(`${assetPath} is expected to be a regular file when asset packaging is 'file'`);
+      }
+      break;
+
+    default:
+      throw new Error(`Unsupported asset packaging format: ${packaging}`);
+  }
+}
diff --git a/packages/@aws-cdk/assets/lib/asset.ts b/packages/@aws-cdk/assets/lib/asset.ts
index d985af72954b7..0e63d09499383 100644
--- a/packages/@aws-cdk/assets/lib/asset.ts
+++ b/packages/@aws-cdk/assets/lib/asset.ts
@@ -2,8 +2,8 @@ import iam = require('@aws-cdk/aws-iam');
 import s3 = require('@aws-cdk/aws-s3');
 import cdk = require('@aws-cdk/cdk');
 import cxapi = require('@aws-cdk/cx-api');
-import fs = require('fs');
-import path = require('path');
+import { AssetArtifact } from './artifact';
+import { FollowMode } from './follow-mode';
 
 /**
  * Defines the way an asset is packaged before it is uploaded to S3.
@@ -32,6 +32,26 @@ export interface GenericAssetProps {
    */
   readonly packaging: AssetPackaging;
 
+  /**
+   * How to treat symlinks in the asset directory (only applicable if this is a directory)
+   * @default External only follows symlinks that are external to the source directory
+   */
+  follow?: FollowMode;
+
+  /**
+   * Glob patterns to exclude from the copy.
+   * Only applicable for directories.
+   */
+  exclude?: string[];
+
+  /**
+   * An extra string to include in the asset's fingerprint. This can be used to
+   * incorporate things like build commands and settings into the asset hash so
+   * that it will be invalidated based on those as well as on the content
+   * itself.
+   */
+  extra?: string;
+
   /**
    * A list of principals that should be able to read this asset from S3.
    * You can use `asset.grantRead(principal)` to grant read permissions later.
@@ -40,8 +60,13 @@ export interface GenericAssetProps {
 }
 
 /**
- * An asset represents a local file or directory, which is automatically uploaded to S3
- * and then can be referenced within a CDK application.
+ * An asset represents a local file or directory, which is automatically
+ * uploaded to S3 and then can be referenced within a CDK application.
+ *
+ * Assets are deduplicated at the CDK app level based on their content hash
+ * (fingerprint). This means that two `Asset` objects that refer to the same
+ * asset (with the same copy options) will materialize in synthesis as a single
+ * artifact.
  */
 export class Asset extends cdk.Construct {
   /**
@@ -55,15 +80,15 @@ export class Asset extends cdk.Construct {
   public readonly s3ObjectKey: string;
 
   /**
-   * Attribute which represents the S3 URL of this asset.
-   * @example https://s3.us-west-1.amazonaws.com/bucket/key
+   * Deploy-time attribute with the SHA-256 hash of the asset as it is uploaded to S3.
    */
-  public readonly s3Url: string;
+  public readonly contentSha256: string;
 
   /**
-   * Resolved full-path location of this asset.
+   * Attribute which represents the S3 URL of this asset.
+   * @example https://s3.us-west-1.amazonaws.com/bucket/key
    */
-  public readonly assetPath: string;
+  public readonly s3Url: string;
 
   /**
    * The S3 bucket in which this asset resides.
@@ -76,64 +101,43 @@ export class Asset extends cdk.Construct {
    */
   public readonly isZipArchive: boolean;
 
+  /**
+   * The fingerprint (content hash) of this asset.
+   */
+  public readonly fingerprint: string;
+
   /**
    * The S3 prefix where all different versions of this asset are stored
    */
   private readonly s3Prefix: string;
 
+  /**
+   * Path of source
+   */
+  private readonly sourcePath: string;
+
   constructor(scope: cdk.Construct, id: string, props: GenericAssetProps) {
     super(scope, id);
 
-    // resolve full path
-    this.assetPath = path.resolve(props.path);
+    this.sourcePath = props.path;
+
+    const artifact = AssetArtifact.forAsset(this, props);
+    const params = artifact.wireToStack(this.node.stack);
 
     // sets isZipArchive based on the type of packaging and file extension
     const allowedExtensions: string[] = ['.jar', '.zip'];
     this.isZipArchive = props.packaging === AssetPackaging.ZipDirectory
       ? true
-      : allowedExtensions.some(ext => this.assetPath.toLowerCase().endsWith(ext));
-
-    validateAssetOnDisk(this.assetPath, props.packaging);
+      : allowedExtensions.some(ext => props.path.toLowerCase().endsWith(ext));
 
-    // add parameters for s3 bucket and s3 key. those will be set by
-    // the toolkit or by CI/CD when the stack is deployed and will include
-    // the name of the bucket and the S3 key where the code lives.
-
-    const bucketParam = new cdk.CfnParameter(this, 'S3Bucket', {
-      type: 'String',
-      description: `S3 bucket for asset "${this.node.path}"`,
-    });
-
-    const keyParam = new cdk.CfnParameter(this, 'S3VersionKey', {
-      type: 'String',
-      description: `S3 key for asset version "${this.node.path}"`
-    });
-
-    this.s3BucketName = bucketParam.stringValue;
-    this.s3Prefix = cdk.Fn.select(0, cdk.Fn.split(cxapi.ASSET_PREFIX_SEPARATOR, keyParam.stringValue)).toString();
-    const s3Filename = cdk.Fn.select(1, cdk.Fn.split(cxapi.ASSET_PREFIX_SEPARATOR, keyParam.stringValue)).toString();
+    this.fingerprint = artifact.fingerprint;
+    this.s3BucketName = params.bucket.stringValue;
+    this.s3Prefix = cdk.Fn.select(0, cdk.Fn.split(cxapi.ASSET_PREFIX_SEPARATOR, params.key.stringValue)).toString();
+    const s3Filename = cdk.Fn.select(1, cdk.Fn.split(cxapi.ASSET_PREFIX_SEPARATOR, params.key.stringValue)).toString();
     this.s3ObjectKey = `${this.s3Prefix}${s3Filename}`;
-
-    this.bucket = s3.Bucket.import(this, 'AssetBucket', {
-      bucketName: this.s3BucketName
-    });
-
-    // form the s3 URL of the object key
+    this.bucket = s3.Bucket.import(this, 'AssetBucket', { bucketName: this.s3BucketName });
     this.s3Url = this.bucket.urlForObject(this.s3ObjectKey);
-
-    // attach metadata to the lambda function which includes information
-    // for tooling to be able to package and upload a directory to the
-    // s3 bucket and plug in the bucket name and key in the correct
-    // parameters.
-    const asset: cxapi.FileAssetMetadataEntry = {
-      path: this.assetPath,
-      id: this.node.uniqueId,
-      packaging: props.packaging,
-      s3BucketParameter: bucketParam.logicalId,
-      s3KeyParameter: keyParam.logicalId,
-    };
-
-    this.node.addMetadata(cxapi.ASSET_METADATA, asset);
+    this.contentSha256 = params.sha256.stringValue;
 
     for (const reader of (props.readers || [])) {
       this.grantRead(reader);
@@ -164,7 +168,7 @@ export class Asset extends cdk.Construct {
     // tell tools such as SAM CLI that the "Code" property of this resource
     // points to a local path in order to enable local invocation of this function.
     resource.options.metadata = resource.options.metadata || { };
-    resource.options.metadata[cxapi.ASSET_RESOURCE_METADATA_PATH_KEY] = this.assetPath;
+    resource.options.metadata[cxapi.ASSET_RESOURCE_METADATA_PATH_KEY] = this.sourcePath;
     resource.options.metadata[cxapi.ASSET_RESOURCE_METADATA_PROPERTY_KEY] = resourceProperty;
   }
 
@@ -223,26 +227,3 @@ export class ZipDirectoryAsset extends Asset {
     super(scope, id, { packaging: AssetPackaging.ZipDirectory, ...props });
   }
 }
-
-function validateAssetOnDisk(assetPath: string, packaging: AssetPackaging) {
-  if (!fs.existsSync(assetPath)) {
-    throw new Error(`Cannot find asset at ${assetPath}`);
-  }
-
-  switch (packaging) {
-    case AssetPackaging.ZipDirectory:
-      if (!fs.statSync(assetPath).isDirectory()) {
-        throw new Error(`${assetPath} is expected to be a directory when asset packaging is 'zip'`);
-      }
-      break;
-
-    case AssetPackaging.File:
-      if (!fs.statSync(assetPath).isFile()) {
-        throw new Error(`${assetPath} is expected to be a regular file when asset packaging is 'file'`);
-      }
-      break;
-
-    default:
-      throw new Error(`Unsupported asset packaging format: ${packaging}`);
-  }
-}
diff --git a/packages/@aws-cdk/assets/lib/follow-mode.ts b/packages/@aws-cdk/assets/lib/follow-mode.ts
new file mode 100644
index 0000000000000..9334328982236
--- /dev/null
+++ b/packages/@aws-cdk/assets/lib/follow-mode.ts
@@ -0,0 +1,29 @@
+export enum FollowMode {
+  /**
+   * Never follow symlinks.
+   */
+  Never = 'never',
+
+  /**
+   * Materialize all symlinks, whether they are internal or external to the source directory.
+   */
+  Always = 'always',
+
+  /**
+   * Only follows symlinks that are external to the source directory.
+   */
+  External = 'external',
+
+  // ----------------- TODO::::::::::::::::::::::::::::::::::::::::::::
+  /**
+   * Forbids source from having any symlinks pointing outside of the source
+   * tree.
+   *
+   * This is the safest mode of operation as it ensures that copy operations
+   * won't materialize files from the user's file system. Internal symlinks are
+   * not followed.
+   *
+   * If the copy operation runs into an external symlink, it will fail.
+   */
+  BlockExternal = 'internal-only',
+}
diff --git a/packages/@aws-cdk/assets/lib/fs-copy.ts b/packages/@aws-cdk/assets/lib/fs-copy.ts
new file mode 100644
index 0000000000000..2e604a4e03e26
--- /dev/null
+++ b/packages/@aws-cdk/assets/lib/fs-copy.ts
@@ -0,0 +1,89 @@
+import fs = require('fs');
+import minimatch = require('minimatch');
+import path = require('path');
+import { FollowMode } from './follow-mode';
+
+export interface CopyOptions {
+  /**
+   * @default External only follows symlinks that are external to the source directory
+   */
+  follow?: FollowMode;
+
+  /**
+   * glob patterns to exclude from the copy.
+   */
+  exclude?: string[];
+}
+
+export function copyDirectory(srcDir: string, destDir: string, options: CopyOptions = { }, rootDir?: string) {
+  const follow = options.follow !== undefined ? options.follow : FollowMode.External;
+  const exclude = options.exclude || [];
+
+  rootDir = rootDir || srcDir;
+
+  if (!fs.statSync(srcDir).isDirectory()) {
+    throw new Error(`${srcDir} is not a directory`);
+  }
+
+  const files = fs.readdirSync(srcDir);
+  for (const file of files) {
+    const sourceFilePath = path.join(srcDir, file);
+
+    if (shouldExclude(path.relative(rootDir, sourceFilePath))) {
+      continue;
+    }
+
+    const destFilePath = path.join(destDir, file);
+
+    let stat: fs.Stats | undefined = follow === FollowMode.Always
+      ? fs.statSync(sourceFilePath)
+      : fs.lstatSync(sourceFilePath);
+
+    if (stat && stat.isSymbolicLink()) {
+      const target = fs.readlinkSync(sourceFilePath);
+
+      // determine if this is an external link (i.e. the target's absolute path
+      // is outside of the root directory).
+      const targetPath = path.normalize(path.resolve(srcDir, target));
+      const rootPath = path.normalize(rootDir);
+      const external = !targetPath.startsWith(rootPath);
+
+      if (follow === FollowMode.External && external) {
+        stat = fs.statSync(sourceFilePath);
+      } else {
+        fs.symlinkSync(target, destFilePath);
+        stat = undefined;
+      }
+    }
+
+    if (stat && stat.isDirectory()) {
+      fs.mkdirSync(destFilePath);
+      copyDirectory(sourceFilePath, destFilePath, options, rootDir);
+      stat = undefined;
+    }
+
+    if (stat && stat.isFile()) {
+      fs.copyFileSync(sourceFilePath, destFilePath);
+      stat = undefined;
+    }
+  }
+
+  function shouldExclude(filePath: string): boolean {
+    let excludeOutput = false;
+
+    for (const pattern of exclude) {
+      const negate = pattern.startsWith('!');
+      const match = minimatch(filePath, pattern, { matchBase: true, flipNegate: true });
+
+      if (!negate && match) {
+        excludeOutput = true;
+      }
+
+      if (negate && match) {
+        excludeOutput = false;
+      }
+    }
+
+    return excludeOutput;
+  }
+}
diff --git a/packages/@aws-cdk/assets/lib/fs-fingerprint.ts b/packages/@aws-cdk/assets/lib/fs-fingerprint.ts
new file mode 100644
index 0000000000000..06cdb6a0ed2aa
--- /dev/null
+++ b/packages/@aws-cdk/assets/lib/fs-fingerprint.ts
@@ -0,0 +1,86 @@
+import crypto = require('crypto');
+import fs = require('fs');
+import path = require('path');
+import { FollowMode } from './follow-mode';
+
+const BUFFER_SIZE = 8 * 1024;
+
+export interface FingerprintOptions {
+  /**
+   * Extra information to encode into the fingerprint (e.g. build instructions
+   * and other inputs)
+   */
+  extra?: string;
+
+  /**
+   * List of exclude patterns (see `CopyOptions`)
+   * @default include all files
+   */
+  exclude?: string[];
+
+  /**
+   * What to do when we encounter symlinks.
+   * @default External only follows symlinks that are external to the source
+   * directory
+   */
+  follow?: FollowMode;
+}
+
+/**
+ * Produces fingerprint based on the contents of a single file or an entire directory tree.
+ *
+ * The fingerprint will also include:
+ * 1. An extra string if defined in `options.extra`.
+ * 2. The set of exclude patterns, if defined in `options.exclude`
+ * 3. The symlink follow mode value.
+ *
+ * @param fileOrDirectory The directory or file to fingerprint
+ * @param options Fingerprinting options
+ */
+export function fingerprint(fileOrDirectory: string, options: FingerprintOptions = { }) {
+  const follow = options.follow !== undefined ? options.follow : FollowMode.External;
+  const hash = crypto.createHash('md5');
+  addToHash(fileOrDirectory);
+
+  hash.update(`==follow==${follow}==\n\n`);
+
+  if (options.extra) {
+    hash.update(`==extra==${options.extra}==\n\n`);
+  }
+
+  for (const ex of options.exclude || []) {
+    hash.update(`==exclude==${ex}==\n\n`);
+  }
+
+  return hash.digest('hex');
+
+  function addToHash(pathToAdd: string) {
+    hash.update('==\n');
+    const relativePath = path.relative(fileOrDirectory, pathToAdd);
+    hash.update(relativePath + '\n');
+    hash.update('~~~~~~~~~~~~~~~~~~\n');
+    const stat = fs.statSync(pathToAdd);
+
+    if (stat.isSymbolicLink()) {
+      const target = fs.readlinkSync(pathToAdd);
+      hash.update(target);
+    } else if (stat.isDirectory()) {
+      for (const file of fs.readdirSync(pathToAdd)) {
+        addToHash(path.join(pathToAdd, file));
+      }
+    } else {
+      const file = fs.openSync(pathToAdd, 'r');
+      const buffer = Buffer.alloc(BUFFER_SIZE);
+
+      try {
+        let bytesRead;
+        do {
+          bytesRead = fs.readSync(file, buffer, 0, BUFFER_SIZE, null);
+          hash.update(buffer.slice(0, bytesRead));
+        } while (bytesRead === BUFFER_SIZE);
+      } finally {
+        fs.closeSync(file);
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/lib/index.ts b/packages/@aws-cdk/assets/lib/index.ts
index ea2719dd83bd3..211c5e6126213 100644
--- a/packages/@aws-cdk/assets/lib/index.ts
+++ b/packages/@aws-cdk/assets/lib/index.ts
@@ -1 +1,2 @@
 export * from './asset';
+export * from './follow-mode';
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/package-lock.json b/packages/@aws-cdk/assets/package-lock.json
new file mode 100644
index 0000000000000..5baf04f3aeeda
--- /dev/null
+++ b/packages/@aws-cdk/assets/package-lock.json
@@ -0,0 +1,4839 @@
+{
+  "name": "@aws-cdk/assets",
+  "version": "0.25.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.0.0"
+      }
+    },
+    "@babel/core": {
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.3.4.tgz",
+      "integrity": "sha512-jRsuseXBo9pN197KnDwhhaaBzyZr2oIcLHHTt2oDdQrej5Qp57dCCJafWx5ivU8/alEYDpssYqv1MUqcxwQlrA==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/generator": "^7.3.4",
+        "@babel/helpers": "^7.2.0",
+        "@babel/parser": "^7.3.4",
+        "@babel/template": "^7.2.2",
+        "@babel/traverse": "^7.3.4",
+        "@babel/types": "^7.3.4",
+        "convert-source-map": "^1.1.0",
+        "debug": "^4.1.0",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.11",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/generator": {
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.3.4.tgz",
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+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.11",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
+      }
+    },
+    "@babel/helper-function-name": {
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+      "dev": true
+    },
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+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
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+      "dev": true
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+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
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+    "verror": {
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+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
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+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
+    "w3c-hr-time": {
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+      "integrity": "sha1-gqwr/2PZUOqeMYmlimViX+3xkEU=",
+      "dev": true,
+      "requires": {
+        "browser-process-hrtime": "^0.1.2"
+      }
+    },
+    "walker": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.7.tgz",
+      "integrity": "sha1-L3+bj9ENZ3JisYqITijRlhjgKPs=",
+      "dev": true,
+      "requires": {
+        "makeerror": "1.0.x"
+      }
+    },
+    "watch": {
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+      "resolved": "https://registry.npmjs.org/watch/-/watch-0.18.0.tgz",
+      "integrity": "sha1-KAlUdsbffJDJYxOJkMClQj60uYY=",
+      "dev": true,
+      "requires": {
+        "exec-sh": "^0.2.0",
+        "minimist": "^1.2.0"
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+        "minimist": {
+          "version": "1.2.0",
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+          "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+          "dev": true
+        }
+      }
+    },
+    "webidl-conversions": {
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+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
+      "integrity": "sha512-YQ+BmxuTgd6UXZW3+ICGfyqRyHXVlD5GtQr5+qjiNW7bF0cqrzX500HVXPBOvgXb5YnzDd+h0zqyv61KUD7+Sg==",
+      "dev": true
+    },
+    "whatwg-encoding": {
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+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.24"
+      }
+    },
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g==",
+      "dev": true
+    },
+    "whatwg-url": {
+      "version": "6.5.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-6.5.0.tgz",
+      "integrity": "sha512-rhRZRqx/TLJQWUpQ6bmrt2UV4f0HCQ463yQuONJqC6fO2VoEb1pTYddbe59SkYq87aoM5A3bdhMZiUiVws+fzQ==",
+      "dev": true,
+      "requires": {
+        "lodash.sortby": "^4.7.0",
+        "tr46": "^1.0.1",
+        "webidl-conversions": "^4.0.2"
+      }
+    },
+    "which": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "dev": true,
+      "requires": {
+        "isexe": "^2.0.0"
+      }
+    },
+    "which-module": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz",
+      "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
+      "dev": true
+    },
+    "wordwrap": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
+      "integrity": "sha1-o9XabNXAvAAI03I0u68b7WMFkQc=",
+      "dev": true
+    },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true,
+          "requires": {
+            "number-is-nan": "^1.0.0"
+          }
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+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true,
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
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+    "wrappy": {
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+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "write-file-atomic": {
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+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
+      "integrity": "sha512-TGHFeZEZMnv+gBFRfjAcxL5bPHrsGKtnb4qsFAws7/vlh+QfwAaySIw4AXP9ZskTTh5GWu3FLuJhsWVdiJPGvg==",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
+    "ws": {
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+      "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
+      "integrity": "sha512-jaHFD6PFv6UgoIVda6qZllptQsMlDEJkTQcybzzXDYM1XO9Y8em691FGMPmM46WGyLU4z9KMgQN+qrux/nhlHA==",
+      "dev": true,
+      "requires": {
+        "async-limiter": "~1.0.0"
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+    "xml-name-validator": {
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+      "dev": true
+    },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
+    "yargs": {
+      "version": "12.0.5",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
+      "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
+      "dev": true,
+      "requires": {
+        "cliui": "^4.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^3.0.0",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^2.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^3.2.1 || ^4.0.0",
+        "yargs-parser": "^11.1.1"
+      }
+    },
+    "yargs-parser": {
+      "version": "11.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+      "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    }
+  }
+}
diff --git a/packages/@aws-cdk/assets/package.json b/packages/@aws-cdk/assets/package.json
index d2d012b51d7a9..57b726b2fb1e1 100644
--- a/packages/@aws-cdk/assets/package.json
+++ b/packages/@aws-cdk/assets/package.json
@@ -35,7 +35,7 @@
     "build": "cdk-build",
     "watch": "cdk-watch",
     "lint": "cdk-lint",
-    "test": "cdk-test",
+    "test": "jest",
     "integ": "cdk-integ",
     "pkglint": "pkglint -f",
     "package": "cdk-package",
@@ -55,16 +55,23 @@
   "license": "Apache-2.0",
   "devDependencies": {
     "@aws-cdk/assert": "^0.28.0",
+    "@types/jest": "^24.0.9",
+    "@types/minimatch": "^3.0.3",
     "aws-cdk": "^0.28.0",
     "cdk-build-tools": "^0.28.0",
     "cdk-integ-tools": "^0.28.0",
+    "jest": "^24.1.0",
     "pkglint": "^0.28.0"
   },
+  "bundledDependencies": [
+    "minimatch"
+  ],
   "dependencies": {
     "@aws-cdk/aws-iam": "^0.28.0",
     "@aws-cdk/aws-s3": "^0.28.0",
     "@aws-cdk/cdk": "^0.28.0",
-    "@aws-cdk/cx-api": "^0.28.0"
+    "@aws-cdk/cx-api": "^0.28.0",
+    "minimatch": "^3.0.4"
   },
   "homepage": "https://github.com/awslabs/aws-cdk",
   "peerDependencies": {
@@ -75,4 +82,4 @@
   "engines": {
     "node": ">= 8.10.0"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/@aws-cdk/assets/test/__snapshots__/assets.test.js.snap b/packages/@aws-cdk/assets/test/__snapshots__/assets.test.js.snap
new file mode 100644
index 0000000000000..a30458d5e496e
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/__snapshots__/assets.test.js.snap
@@ -0,0 +1,226 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`file assets 1`] = `
+Object {
+  "assembly": Object {
+    "manifest.json": Object {
+      "artifacts": Object {
+        "asset_4be9b497d3aade053d066e81efc93fbd": Object {
+          "environment": "aws://unknown-account/unknown-region",
+          "properties": Object {
+            "file": "4be9b497d3aade053d066e81efc93fbd.txt",
+          },
+          "type": "aws:s3:object",
+        },
+        "stack1": Object {
+          "environment": "aws://unknown-account/unknown-region",
+          "properties": Object {
+            "parameters": Object {
+              "asset4be9b497d3aade053d066e81efc93fbdS3Bucket": "\${asset_4be9b497d3aade053d066e81efc93fbd}.s3bucket",
+              "asset4be9b497d3aade053d066e81efc93fbdS3ContentHash": "\${asset_4be9b497d3aade053d066e81efc93fbd}.sha256",
+              "asset4be9b497d3aade053d066e81efc93fbdS3Key": "\${asset_4be9b497d3aade053d066e81efc93fbd}.s3key",
+            },
+            "templateFile": "stack1.template.json",
+          },
+          "type": "aws:cloudformation:stack",
+        },
+      },
+      "version": "0.19.0",
+    },
+    "stack1.template.json": Object {
+      "Parameters": Object {
+        "asset4be9b497d3aade053d066e81efc93fbdS3Bucket": Object {
+          "Description": "S3 bucket for asset 4be9b497d3aade053d066e81efc93fbd from /Users/benisrae/code/cdk/aws-cdk-3/packages/@aws-cdk/assets/test/fixtures/test1/file1.txt",
+          "Type": "String",
+        },
+        "asset4be9b497d3aade053d066e81efc93fbdS3ContentHash": Object {
+          "Description": "SHA-256 hash of the asset as it was uploaded to S3",
+          "Type": "String",
+        },
+        "asset4be9b497d3aade053d066e81efc93fbdS3Key": Object {
+          "Description": "S3 key for asset 4be9b497d3aade053d066e81efc93fbd from /Users/benisrae/code/cdk/aws-cdk-3/packages/@aws-cdk/assets/test/fixtures/test1/file1.txt",
+          "Type": "String",
+        },
+      },
+    },
+  },
+  "build.json": Object {
+    "steps": Object {
+      "asset_4be9b497d3aade053d066e81efc93fbd": Object {
+        "parameters": Object {
+          "dest": "assembly/4be9b497d3aade053d066e81efc93fbd.txt",
+          "src": "staging/4be9b497d3aade053d066e81efc93fbd/file1.txt",
+        },
+        "type": "CopyFileTask",
+      },
+    },
+  },
+  "staging": Object {
+    "4be9b497d3aade053d066e81efc93fbd": Object {
+      "file1.txt": "file1",
+    },
+  },
+}
+`;
+
+exports[`two assets with the same source will result in a single artifact 1`] = `
+Object {
+  "assembly": Object {
+    "manifest.json": Object {
+      "artifacts": Object {
+        "asset_6a2bd71840ef97020185c6357b101a70": Object {
+          "environment": "aws://unknown-account/unknown-region",
+          "properties": Object {
+            "file": "6a2bd71840ef97020185c6357b101a70.zip",
+          },
+          "type": "aws:s3:object",
+        },
+        "stack1": Object {
+          "environment": "aws://unknown-account/unknown-region",
+          "properties": Object {
+            "parameters": Object {
+              "asset6a2bd71840ef97020185c6357b101a70S3Bucket": "\${asset_6a2bd71840ef97020185c6357b101a70}.s3bucket",
+              "asset6a2bd71840ef97020185c6357b101a70S3ContentHash": "\${asset_6a2bd71840ef97020185c6357b101a70}.sha256",
+              "asset6a2bd71840ef97020185c6357b101a70S3Key": "\${asset_6a2bd71840ef97020185c6357b101a70}.s3key",
+            },
+            "templateFile": "stack1.template.json",
+          },
+          "type": "aws:cloudformation:stack",
+        },
+      },
+      "runtime": Object {
+        "libraries": Object {
+          "jsii-runtime": "node.js/v10.13.0",
+        },
+      },
+      "version": "0.19.0",
+    },
+    "stack1.template.json": Object {
+      "Parameters": Object {
+        "asset6a2bd71840ef97020185c6357b101a70S3Bucket": Object {
+          "Description": "S3 bucket for asset 6a2bd71840ef97020185c6357b101a70 from /Users/benisrae/code/cdk/aws-cdk-3/packages/@aws-cdk/assets/test/fixtures/test1",
+          "Type": "String",
+        },
+        "asset6a2bd71840ef97020185c6357b101a70S3ContentHash": Object {
+          "Description": "SHA-256 hash of the asset as it was uploaded to S3",
+          "Type": "String",
+        },
+        "asset6a2bd71840ef97020185c6357b101a70S3Key": Object {
+          "Description": "S3 key for asset 6a2bd71840ef97020185c6357b101a70 from /Users/benisrae/code/cdk/aws-cdk-3/packages/@aws-cdk/assets/test/fixtures/test1",
+          "Type": "String",
+        },
+      },
+    },
+  },
+  "build.json": Object {
+    "steps": Object {
+      "asset_6a2bd71840ef97020185c6357b101a70": Object {
+        "parameters": Object {
+          "dest": "assembly/6a2bd71840ef97020185c6357b101a70.zip",
+          "src": "staging/6a2bd71840ef97020185c6357b101a70",
+        },
+        "type": "ZipDirectoryTask",
+      },
+    },
+  },
+  "staging": Object {
+    "6a2bd71840ef97020185c6357b101a70": Object {
+      "external-link.txt": "this is a normal file",
+      "file1.txt": "file1",
+      "local-link.txt": "file1",
+      "subdir": Object {
+        "file2.txt": "file2 in subdir",
+      },
+      "subdir2": Object {
+        "empty-subdir": Object {
+          ".hidden": "hidden file",
+        },
+        "subdir3": Object {
+          "file3.txt": "file3 in subdir2/subdir3",
+        },
+      },
+    },
+  },
+}
+`;
+
+exports[`zip directory assets 1`] = `
+Object {
+  "assembly": Object {
+    "manifest.json": Object {
+      "artifacts": Object {
+        "asset_6a2bd71840ef97020185c6357b101a70": Object {
+          "environment": "aws://unknown-account/unknown-region",
+          "properties": Object {
+            "file": "6a2bd71840ef97020185c6357b101a70.zip",
+          },
+          "type": "aws:s3:object",
+        },
+        "stack1": Object {
+          "environment": "aws://unknown-account/unknown-region",
+          "properties": Object {
+            "parameters": Object {
+              "asset6a2bd71840ef97020185c6357b101a70S3Bucket": "\${asset_6a2bd71840ef97020185c6357b101a70}.s3bucket",
+              "asset6a2bd71840ef97020185c6357b101a70S3ContentHash": "\${asset_6a2bd71840ef97020185c6357b101a70}.sha256",
+              "asset6a2bd71840ef97020185c6357b101a70S3Key": "\${asset_6a2bd71840ef97020185c6357b101a70}.s3key",
+            },
+            "templateFile": "stack1.template.json",
+          },
+          "type": "aws:cloudformation:stack",
+        },
+      },
+      "runtime": Object {
+        "libraries": Object {
+          "jsii-runtime": "node.js/v10.13.0",
+        },
+      },
+      "version": "0.19.0",
+    },
+    "stack1.template.json": Object {
+      "Parameters": Object {
+        "asset6a2bd71840ef97020185c6357b101a70S3Bucket": Object {
+          "Description": "S3 bucket for asset 6a2bd71840ef97020185c6357b101a70 from /Users/benisrae/code/cdk/aws-cdk-3/packages/@aws-cdk/assets/test/fixtures/test1",
+          "Type": "String",
+        },
+        "asset6a2bd71840ef97020185c6357b101a70S3ContentHash": Object {
+          "Description": "SHA-256 hash of the asset as it was uploaded to S3",
+          "Type": "String",
+        },
+        "asset6a2bd71840ef97020185c6357b101a70S3Key": Object {
+          "Description": "S3 key for asset 6a2bd71840ef97020185c6357b101a70 from /Users/benisrae/code/cdk/aws-cdk-3/packages/@aws-cdk/assets/test/fixtures/test1",
+          "Type": "String",
+        },
+      },
+    },
+  },
+  "build.json": Object {
+    "steps": Object {
+      "asset_6a2bd71840ef97020185c6357b101a70": Object {
+        "parameters": Object {
+          "dest": "assembly/6a2bd71840ef97020185c6357b101a70.zip",
+          "src": "staging/6a2bd71840ef97020185c6357b101a70",
+        },
+        "type": "ZipDirectoryTask",
+      },
+    },
+  },
+  "staging": Object {
+    "6a2bd71840ef97020185c6357b101a70": Object {
+      "external-link.txt": "this is a normal file",
+      "file1.txt": "file1",
+      "local-link.txt": "file1",
+      "subdir": Object {
+        "file2.txt": "file2 in subdir",
+      },
+      "subdir2": Object {
+        "empty-subdir": Object {
+          ".hidden": "hidden file",
+        },
+        "subdir3": Object {
+          "file3.txt": "file3 in subdir2/subdir3",
+        },
+      },
+    },
+  },
+}
+`;
diff --git a/packages/@aws-cdk/assets/test/assets.test.ts b/packages/@aws-cdk/assets/test/assets.test.ts
new file mode 100644
index 0000000000000..3bd7035d58fe7
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/assets.test.ts
@@ -0,0 +1,69 @@
+import cdk = require('@aws-cdk/cdk');
+import cxapi = require('@aws-cdk/cx-api');
+import fs = require('fs');
+import path = require('path');
+import { FileAsset, ZipDirectoryAsset } from '../lib';
+
+const SAMPLE_ASSET_DIRECTORY = path.join(__dirname, 'fixtures', 'test1');
+
+test('file assets', () => {
+  // GIVEN
+  const app = new cdk.App({
+    context: {
+      [cxapi.DISABLE_STACK_TRACE]: 'true',
+      [cxapi.DISABLE_VERSION_REPORTING]: 'true'
+    }
+  });
+  const stack = new cdk.Stack(app, 'stack1');
+
+  // WHEN
+  new FileAsset(stack, 'my-first-modern-file-asset', {
+    path: path.join(SAMPLE_ASSET_DIRECTORY, 'file1.txt')
+  });
+
+  // THEN
+  const session = app.run();
+  expect(snapshotDirectory(session.path)).toMatchSnapshot();
+});
+
+test('zip directory assets', () => {
+  // GIVEN
+  const app = new cdk.App({ context: { [cxapi.DISABLE_STACK_TRACE]: 'true' } });
+  const stack = new cdk.Stack(app, 'stack1');
+
+  // WHEN
+  new ZipDirectoryAsset(stack, 'my-first-zip-dir-asset', {
+    path: SAMPLE_ASSET_DIRECTORY
+  });
+
+  // THEN
+  expect(snapshotDirectory(app.run().path)).toMatchSnapshot();
+});
+
+test('two assets with the same source will result in a single artifact', () => {
+  // GIVEN
+  const app = new cdk.App({ context: { [cxapi.DISABLE_STACK_TRACE]: 'true' } });
+  const stack = new cdk.Stack(app, 'stack1');
+
+  // WHEN
+  new ZipDirectoryAsset(stack, 'asset1', { path: SAMPLE_ASSET_DIRECTORY });
+  new ZipDirectoryAsset(stack, 'asset2', { path: SAMPLE_ASSET_DIRECTORY });
+
+  // THEN
+  expect(snapshotDirectory(app.run().path)).toMatchSnapshot();
+});
+
+function snapshotDirectory(dir: string) {
+  const entries: { [name: string]: any } = { };
+  for (const file of fs.readdirSync(dir)) {
+    const fp = path.join(dir, file);
+    if (fs.statSync(fp).isDirectory()) {
+      entries[file] = snapshotDirectory(fp);
+    } else if (path.extname(file) === '.json') {
+      entries[file] = JSON.parse(fs.readFileSync(fp).toString());
+    } else {
+      entries[file] = fs.readFileSync(fp).toString().trim();
+    }
+  }
+  return entries;
+}
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/fixtures/symlinks/external-dir-link b/packages/@aws-cdk/assets/test/fixtures/symlinks/external-dir-link
new file mode 120000
index 0000000000000..b9447033a4279
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/symlinks/external-dir-link
@@ -0,0 +1 @@
+../test1/subdir
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/fixtures/symlinks/external-link.txt b/packages/@aws-cdk/assets/test/fixtures/symlinks/external-link.txt
new file mode 120000
index 0000000000000..267020c936652
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/symlinks/external-link.txt
@@ -0,0 +1 @@
+../test1/subdir2/subdir3/file3.txt
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/fixtures/symlinks/indirect-external-link.txt b/packages/@aws-cdk/assets/test/fixtures/symlinks/indirect-external-link.txt
new file mode 120000
index 0000000000000..907a2a65b1515
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/symlinks/indirect-external-link.txt
@@ -0,0 +1 @@
+external-link.txt
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/fixtures/symlinks/local-dir-link b/packages/@aws-cdk/assets/test/fixtures/symlinks/local-dir-link
new file mode 120000
index 0000000000000..42101049ac31a
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/symlinks/local-dir-link
@@ -0,0 +1 @@
+normal-dir
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/fixtures/symlinks/local-link.txt b/packages/@aws-cdk/assets/test/fixtures/symlinks/local-link.txt
new file mode 120000
index 0000000000000..b3c6fdbd8bfad
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/symlinks/local-link.txt
@@ -0,0 +1 @@
+normal-file.txt
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/fixtures/symlinks/normal-dir/file-in-subdir.txt b/packages/@aws-cdk/assets/test/fixtures/symlinks/normal-dir/file-in-subdir.txt
new file mode 100644
index 0000000000000..f52de026412b3
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/symlinks/normal-dir/file-in-subdir.txt
@@ -0,0 +1 @@
+file in subdir
diff --git a/packages/@aws-cdk/assets/test/fixtures/symlinks/normal-file.txt b/packages/@aws-cdk/assets/test/fixtures/symlinks/normal-file.txt
new file mode 100644
index 0000000000000..d627587e36e77
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/symlinks/normal-file.txt
@@ -0,0 +1 @@
+this is a normal file
diff --git a/packages/@aws-cdk/assets/test/fixtures/test1/external-link.txt b/packages/@aws-cdk/assets/test/fixtures/test1/external-link.txt
new file mode 120000
index 0000000000000..c7ba61290b25a
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/test1/external-link.txt
@@ -0,0 +1 @@
+../symlinks/normal-file.txt
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/fixtures/test1/file1.txt b/packages/@aws-cdk/assets/test/fixtures/test1/file1.txt
new file mode 100644
index 0000000000000..e2129701f1a4d
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/test1/file1.txt
@@ -0,0 +1 @@
+file1
diff --git a/packages/@aws-cdk/assets/test/fixtures/test1/local-link.txt b/packages/@aws-cdk/assets/test/fixtures/test1/local-link.txt
new file mode 120000
index 0000000000000..39cd5762dce4e
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/test1/local-link.txt
@@ -0,0 +1 @@
+file1.txt
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/fixtures/test1/subdir/file2.txt b/packages/@aws-cdk/assets/test/fixtures/test1/subdir/file2.txt
new file mode 100644
index 0000000000000..97bbbd35efdff
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/test1/subdir/file2.txt
@@ -0,0 +1 @@
+file2 in subdir
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/fixtures/test1/subdir2/empty-subdir/.hidden b/packages/@aws-cdk/assets/test/fixtures/test1/subdir2/empty-subdir/.hidden
new file mode 100644
index 0000000000000..b96b7256c6541
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/test1/subdir2/empty-subdir/.hidden
@@ -0,0 +1 @@
+hidden file
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/fixtures/test1/subdir2/subdir3/file3.txt b/packages/@aws-cdk/assets/test/fixtures/test1/subdir2/subdir3/file3.txt
new file mode 100644
index 0000000000000..eae5e936a040d
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/fixtures/test1/subdir2/subdir3/file3.txt
@@ -0,0 +1 @@
+file3 in subdir2/subdir3
diff --git a/packages/@aws-cdk/assets/test/test.asset-artifact.ts b/packages/@aws-cdk/assets/test/test.asset-artifact.ts
new file mode 100644
index 0000000000000..a515fc96f14cd
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/test.asset-artifact.ts
@@ -0,0 +1,91 @@
+import cdk = require('@aws-cdk/cdk');
+// import cxapi = require('@aws-cdk/cx-api');
+import { Test } from 'nodeunit';
+import path = require('path');
+import { AssetPackaging } from '../lib';
+import { AssetArtifact } from '../lib/artifact';
+
+export = {
+  'assets are deduplicated based on their fingerprint'(test: Test) {
+    const app = new cdk.App();
+
+    const assetPath = path.join(__dirname, 'sample-asset-directory');
+
+    // note that stacks are also mapped to different environments
+    const stack1 = new cdk.Stack(app, 'stack1', { env: { account: '11111', region: 'us-east-1' } });
+    const stack2 = new cdk.Stack(app, 'stack2', { env: { account: '22222', region: 'xx-auaa-3' } });
+
+    const construct1 = new cdk.Construct(stack1, 'SubConstruct');
+
+    // define an asset within the scope of construct1 which is under stack1
+    const artifact1 = AssetArtifact.forAsset(construct1, {
+      path: assetPath,
+      packaging: AssetPackaging.ZipDirectory
+    });
+
+    // another "artifact" within the scope of stack2, but with the same path/packaging
+    const artifact2 = AssetArtifact.forAsset(stack2, {
+      path: assetPath,
+      packaging: AssetPackaging.ZipDirectory
+    });
+
+    // we expect them to be the same object
+    test.same(artifact1, artifact2);
+
+    // this effectively adds CFN parameters to both stacks that are mapped to the same asset
+    // which is defined at the app level
+    artifact1.wireToStack(stack1);
+    artifact1.wireToStack(stack2);
+
+    // synthesize!
+    app.run();
+
+    // // now let's see, each stack should have a single metadata entry for the asset
+    // const md1 = findAssetMetadata(session.manifest, 'stack1');
+    // const md2 = findAssetMetadata(session.manifest, 'stack2');
+
+    // test.equal(md1.length, 1);
+    // test.equal(md2.length, 1);
+
+    // // id and path should be the same
+    // test.deepEqual(md2[0].data.path, assetPath);
+    // test.deepEqual(md1[0].data.id, md2[0].data.id);
+    // test.deepEqual(md2[0].data.path, md2[0].data.path);
+
+    // // templates should be the same because parameters are based on the fingerprint
+    // const stack1Template = session.store.readJson('stack1.template.json');
+    // const stack2Template = session.store.readJson('stack2.template.json');
+    // test.deepEqual(stack1Template, {
+    //   Parameters: {
+    //     assetb55390fe84158c95af1195e7d42c27e0S3Bucket: {
+    //       Type: 'String',
+    //       Description: `S3 bucket for asset b55390fe84158c95af1195e7d42c27e0 from ${assetPath}`
+    //     },
+    //     assetb55390fe84158c95af1195e7d42c27e0S3Key: {
+    //       Type: 'String',
+    //       Description: `S3 key for asset b55390fe84158c95af1195e7d42c27e0 from ${assetPath}`
+    //     }
+    //   }
+    // });
+    // test.deepEqual(stack1Template, stack2Template);
+
+    // // // s3bucket and s3key param IDs should be different (different stacks)
+    // test.deepEqual(md1[0].data.s3BucketParameter, 'assetb55390fe84158c95af1195e7d42c27e0S3Bucket');
+    // test.deepEqual(md2[0].data.s3KeyParameter, 'assetb55390fe84158c95af1195e7d42c27e0S3Key');
+
+    test.done();
+  }
+};
+
+// function findAssetMetadata(manifest: cxapi.AssemblyManifest, artifactId: string) {
+//   return Array.from(findMetadata()).filter(m => m.type === cxapi.ASSET_METADATA);
+
+//   function* findMetadata() {
+//     const artifact: cxapi.Artifact = (manifest.artifacts || {})[artifactId] || {};
+//     for (const entries of Object.values(artifact.metadata || {})) {
+//       for (const md of entries) {
+//         yield md;
+//       }
+//     }
+//   }
+// }
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/test.asset.ts b/packages/@aws-cdk/assets/test/test.asset.ts
index 82147d630f893..77429d4bbb756 100644
--- a/packages/@aws-cdk/assets/test/test.asset.ts
+++ b/packages/@aws-cdk/assets/test/test.asset.ts
@@ -2,37 +2,44 @@ import { expect, haveResource, ResourcePart, SynthUtils } from '@aws-cdk/assert'
 import iam = require('@aws-cdk/aws-iam');
 import cdk = require('@aws-cdk/cdk');
 import cxapi = require('@aws-cdk/cx-api');
+import fs = require('fs');
 import { Test } from 'nodeunit';
+import os = require('os');
 import path = require('path');
 import { FileAsset, ZipDirectoryAsset } from '../lib/asset';
 
+const SAMPLE_ASSET_DIRECTORY = path.join(__dirname, 'sample-asset-directory');
+
 export = {
   'simple use case'(test: Test)  {
     const stack = new cdk.Stack();
-    const dirPath = path.join(__dirname, 'sample-asset-directory');
-    const asset = new ZipDirectoryAsset(stack, 'MyAsset', {
-      path: dirPath
+
+    new ZipDirectoryAsset(stack, 'MyAsset', {
+      path: SAMPLE_ASSET_DIRECTORY
     });
 
     // verify that metadata contains an "aws:cdk:asset" entry with
     // the correct information
-    const entry = asset.node.metadata.find(m => m.type === 'aws:cdk:asset');
-    test.ok(entry, 'found metadata entry');
+    const entry = stack.node.metadata.find(m => m.type === 'aws:cdk:asset');
+    test.ok(entry, 'metadata entry not found');
 
     // console.error(JSON.stringify(stack.node.resolve(entry!.data)));
 
     test.deepEqual(stack.node.resolve(entry!.data), {
-      path: dirPath,
-      id: 'MyAsset',
+      path: SAMPLE_ASSET_DIRECTORY,
+      id: 'asset.b55390fe84158c95af1195e7d42c27e0',
       packaging: 'zip',
-      s3BucketParameter: 'MyAssetS3Bucket68C9B344',
-      s3KeyParameter: 'MyAssetS3VersionKey68E1A45D',
+      s3BucketParameter: 'assetb55390fe84158c95af1195e7d42c27e0S3Bucket',
+      s3KeyParameter: 'assetb55390fe84158c95af1195e7d42c27e0S3Key',
     });
 
     // verify that now the template contains parameters for this asset
-    const template = SynthUtils.toCloudFormation(stack);
-    test.equal(template.Parameters.MyAssetS3Bucket68C9B344.Type, 'String');
-    test.equal(template.Parameters.MyAssetS3VersionKey68E1A45D.Type, 'String');
+    const template = stack._toCloudFormation();
+    test.equal(template.Parameters.assetb55390fe84158c95af1195e7d42c27e0S3Bucket.Type, 'String');
+    test.equal(template.Parameters.assetb55390fe84158c95af1195e7d42c27e0S3Key.Type, 'String');
+    // const template = SynthUtils.toCloudFormation(stack);
+    // test.equal(template.Parameters.MyAssetS3Bucket68C9B344.Type, 'String');
+    // test.equal(template.Parameters.MyAssetS3VersionKey68E1A45D.Type, 'String');
 
     test.done();
   },
@@ -40,20 +47,19 @@ export = {
   'verify that the app resolves tokens in metadata'(test: Test) {
     const app = new cdk.App();
     const stack = new cdk.Stack(app, 'my-stack');
-    const dirPath = path.resolve(__dirname, 'sample-asset-directory');
 
     new ZipDirectoryAsset(stack, 'MyAsset', {
-      path: dirPath
+      path: SAMPLE_ASSET_DIRECTORY
     });
 
     const synth = app.synthesizeStack(stack.name);
 
-    test.deepEqual(synth.metadata['/my-stack/MyAsset'][0].data, {
-      path: dirPath,
-      id: "mystackMyAssetD6B1B593",
+    test.deepEqual(synth.metadata['/my-stack'][0].data, {
+      path: SAMPLE_ASSET_DIRECTORY,
+      id: "asset.b55390fe84158c95af1195e7d42c27e0",
       packaging: "zip",
-      s3BucketParameter: "MyAssetS3Bucket68C9B344",
-      s3KeyParameter: "MyAssetS3VersionKey68E1A45D"
+      s3BucketParameter: "assetb55390fe84158c95af1195e7d42c27e0S3Bucket",
+      s3KeyParameter: "assetb55390fe84158c95af1195e7d42c27e0S3Key"
     });
 
     test.done();
@@ -62,21 +68,28 @@ export = {
   '"file" assets'(test: Test) {
     const stack = new cdk.Stack();
     const filePath = path.join(__dirname, 'file-asset.txt');
-    const asset = new FileAsset(stack, 'MyAsset', { path: filePath });
-    const entry = asset.node.metadata.find(m => m.type === 'aws:cdk:asset');
+    new FileAsset(stack, 'MyAsset', { path: filePath });
+
+    const entry = stack.node.metadata.find(m => m.type === 'aws:cdk:asset');
     test.ok(entry, 'found metadata entry');
     test.deepEqual(stack.node.resolve(entry!.data), {
       path: filePath,
       packaging: 'file',
-      id: 'MyAsset',
-      s3BucketParameter: 'MyAssetS3Bucket68C9B344',
-      s3KeyParameter: 'MyAssetS3VersionKey68E1A45D',
+      id: 'asset.79b1fc4ccf3c001c3dc7aa7b45dd071f',
+      s3BucketParameter: 'asset79b1fc4ccf3c001c3dc7aa7b45dd071fS3Bucket',
+      s3KeyParameter: 'asset79b1fc4ccf3c001c3dc7aa7b45dd071fS3Key',
     });
 
     // verify that now the template contains parameters for this asset
+<<<<<<< HEAD
+    const template = stack.toCloudFormation();
+    test.equal(template.Parameters.asset79b1fc4ccf3c001c3dc7aa7b45dd071fS3Bucket.Type, 'String');
+    test.equal(template.Parameters.asset79b1fc4ccf3c001c3dc7aa7b45dd071fS3Key.Type, 'String');
+=======
     const template = SynthUtils.toCloudFormation(stack);
     test.equal(template.Parameters.MyAssetS3Bucket68C9B344.Type, 'String');
     test.equal(template.Parameters.MyAssetS3VersionKey68E1A45D.Type, 'String');
+>>>>>>> master
 
     test.done();
   },
@@ -87,7 +100,7 @@ export = {
     const group = new iam.Group(stack, 'MyGroup');
 
     const asset = new ZipDirectoryAsset(stack, 'MyAsset', {
-      path: path.join(__dirname, 'sample-asset-directory'),
+      path: SAMPLE_ASSET_DIRECTORY,
       readers: [ user ]
     });
 
@@ -101,12 +114,12 @@ export = {
             Action: ["s3:GetObject*", "s3:GetBucket*", "s3:List*"],
             Effect: 'Allow',
             Resource: [
-              { "Fn::Join": ["", ["arn:", {Ref: "AWS::Partition"}, ":s3:::", {Ref: "MyAssetS3Bucket68C9B344"}]] },
+              { "Fn::Join": ["", ["arn:", {Ref: "AWS::Partition"}, ":s3:::", {Ref: "assetb55390fe84158c95af1195e7d42c27e0S3Bucket"}]] },
               { "Fn::Join": ["",
                 [
-                  "arn:", {Ref: "AWS::Partition"}, ":s3:::", {Ref: "MyAssetS3Bucket68C9B344"},
+                  "arn:", {Ref: "AWS::Partition"}, ":s3:::", {Ref: "assetb55390fe84158c95af1195e7d42c27e0S3Bucket"},
                   "/",
-                  { "Fn::Select": [0, { "Fn::Split": [ "||", { Ref: "MyAssetS3VersionKey68E1A45D" }] }] },
+                  { "Fn::Select": [0, { "Fn::Split": [ "||", { Ref: "assetb55390fe84158c95af1195e7d42c27e0S3Key" }] }] },
                   "*"
                 ]
               ] }
@@ -118,6 +131,7 @@ export = {
 
     test.done();
   },
+
   'fails if directory not found'(test: Test) {
     const stack = new cdk.Stack();
     test.throws(() => new ZipDirectoryAsset(stack, 'MyDirectory', {
@@ -128,14 +142,18 @@ export = {
 
   'multiple assets under the same parent'(test: Test) {
     // GIVEN
-    const stack = new cdk.Stack();
+    const app = new cdk.App();
+    const stack = new cdk.Stack(app, 'stack');
 
     // WHEN
-    new ZipDirectoryAsset(stack, 'MyDirectory1', { path: '.' });
-    new ZipDirectoryAsset(stack, 'MyDirectory2', { path: '.' });
-
-    // THEN: no error
+    new ZipDirectoryAsset(stack, 'MyDirectory1', { path: SAMPLE_ASSET_DIRECTORY });
+    new ZipDirectoryAsset(stack, 'MyDirectory2', { path: SAMPLE_ASSET_DIRECTORY });
 
+    // THEN
+    const output = app.run();
+    const s = (output.manifest.artifacts || {}).stack;
+    const assets = Object.values(s.metadata || {}).reduce((a, m) => [ ...a, ...m.filter((x: any) => x.type === cxapi.ASSET_METADATA) ], []);
+    test.deepEqual(assets.length, 1); // we have a single asset because they point to the same directory
     test.done();
   },
 
@@ -145,19 +163,19 @@ export = {
 
     // WHEN
     const nonZipAsset = new FileAsset(stack, 'NonZipAsset', {
-      path: path.join(__dirname, 'sample-asset-directory', 'sample-asset-file.txt')
+      path: path.join(SAMPLE_ASSET_DIRECTORY, 'sample-asset-file.txt')
     });
 
     const zipDirectoryAsset = new ZipDirectoryAsset(stack, 'ZipDirectoryAsset', {
-      path: path.join(__dirname, 'sample-asset-directory')
+      path: SAMPLE_ASSET_DIRECTORY
     });
 
     const zipFileAsset = new FileAsset(stack, 'ZipFileAsset', {
-      path: path.join(__dirname, 'sample-asset-directory', 'sample-zip-asset.zip')
+      path: path.join(SAMPLE_ASSET_DIRECTORY, 'sample-zip-asset.zip')
     });
 
     const jarFileAsset = new FileAsset(stack, 'JarFileAsset', {
-      path: path.join(__dirname, 'sample-asset-directory', 'sample-jar-asset.jar')
+      path: path.join(SAMPLE_ASSET_DIRECTORY, 'sample-jar-asset.jar')
     });
 
     // THEN
@@ -173,8 +191,13 @@ export = {
     const stack = new cdk.Stack();
     stack.node.setContext(cxapi.ASSET_RESOURCE_METADATA_ENABLED_CONTEXT, true);
 
+<<<<<<< HEAD
+    const location = SAMPLE_ASSET_DIRECTORY;
+    const resource = new cdk.Resource(stack, 'MyResource', { type: 'My::Resource::Type' });
+=======
     const location = path.join(__dirname, 'sample-asset-directory');
     const resource = new cdk.CfnResource(stack, 'MyResource', { type: 'My::Resource::Type' });
+>>>>>>> master
     const asset = new ZipDirectoryAsset(stack, 'MyAsset', { path: location });
 
     // WHEN
@@ -194,8 +217,13 @@ export = {
     // GIVEN
     const stack = new cdk.Stack();
 
+<<<<<<< HEAD
+    const location = SAMPLE_ASSET_DIRECTORY;
+    const resource = new cdk.Resource(stack, 'MyResource', { type: 'My::Resource::Type' });
+=======
     const location = path.join(__dirname, 'sample-asset-directory');
     const resource = new cdk.CfnResource(stack, 'MyResource', { type: 'My::Resource::Type' });
+>>>>>>> master
     const asset = new ZipDirectoryAsset(stack, 'MyAsset', { path: location });
 
     // WHEN
@@ -210,5 +238,44 @@ export = {
     }, ResourcePart.CompleteDefinition));
 
     test.done();
-  }
+  },
+
+  'if the asset directory looks like a temporary directory, copy the asset to CDK_OUTDIR so it will be available after the program ends'(test: Test) {
+    const outdir = path.join(fs.mkdtempSync(path.join(os.tmpdir(), 'cdk.out')));
+
+    const app = new cdk.App({ outdir });
+    const stack = new cdk.Stack(app, 'mystack');
+
+    const assetPath = path.join(fs.mkdtempSync(path.join(os.tmpdir(), 'asset')), 'asset.txt');
+    fs.writeFileSync(assetPath, 'hello, my asset');
+
+    new FileAsset(stack, 'ExternousAsset', {
+      path: assetPath
+    });
+
+    const session = app.run();
+
+    const assets = findAssets(session.manifest);
+
+    test.deepEqual(assets.length, 1);
+    test.deepEqual(assets[0].data.path, 'foo');
+
+    test.done();
+  },
 };
+
+function findAssets(manifest: cxapi.AssemblyManifest): cxapi.MetadataEntry[] {
+  return Array.from(gen());
+
+  function* gen() {
+    for (const artifact of Object.values(manifest.artifacts || {})) {
+      for (const cmd of Object.values(artifact.metadata || {})) {
+        for (const md of cmd) {
+          if (md.type === cxapi.ASSET_METADATA) {
+            yield md;
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/packages/@aws-cdk/assets/test/test.fs-copy.ts b/packages/@aws-cdk/assets/test/test.fs-copy.ts
new file mode 100644
index 0000000000000..57d57fa37e050
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/test.fs-copy.ts
@@ -0,0 +1,146 @@
+import fs = require('fs');
+import { Test } from 'nodeunit';
+import os = require('os');
+import path = require('path');
+import { FollowMode } from '../lib';
+import { copyDirectory } from '../lib/fs-copy';
+
+export = {
+  'Default: copies all files and subdirectories, with default follow mode is "External"'(test: Test) {
+    // GIVEN
+    const outdir = fs.mkdtempSync(path.join(os.tmpdir(), 'copy-tests'));
+
+    // WHEN
+    copyDirectory(path.join(__dirname, 'test.fs.fixtures', 'test1'), outdir);
+
+    // THEN
+    test.deepEqual(tree(outdir), [
+      'external-link.txt',
+      'file1.txt',
+      'local-link.txt => file1.txt',
+      'subdir (D)',
+      '    file2.txt',
+      'subdir2 (D)',
+      '    empty-subdir (D)',
+      '        .hidden',
+      '    subdir3 (D)',
+      '        file3.txt'
+    ]);
+    test.done();
+  },
+
+  'Always: follow all symlinks'(test: Test) {
+    // GIVEN
+    const outdir = fs.mkdtempSync(path.join(os.tmpdir(), 'copy-tests'));
+
+    // WHEN
+    copyDirectory(path.join(__dirname, 'test.fs.fixtures', 'symlinks'), outdir, {
+      follow: FollowMode.Always
+    });
+
+    // THEN
+    test.deepEqual(tree(outdir), [
+      'external-dir-link (D)',
+      '    file2.txt',
+      'external-link.txt',
+      'indirect-external-link.txt',
+      'local-dir-link (D)',
+      '    file-in-subdir.txt',
+      'local-link.txt',
+      'normal-dir (D)',
+      '    file-in-subdir.txt',
+      'normal-file.txt'
+    ]);
+    test.done();
+  },
+
+  'Never: do not follow all symlinks'(test: Test) {
+    // GIVEN
+    const outdir = fs.mkdtempSync(path.join(os.tmpdir(), 'copy-tests'));
+
+    // WHEN
+    copyDirectory(path.join(__dirname, 'test.fs.fixtures', 'symlinks'), outdir, {
+      follow: FollowMode.Never
+    });
+
+    // THEN
+    test.deepEqual(tree(outdir), [
+      'external-dir-link => ../test1/subdir',
+      'external-link.txt => ../test1/subdir2/subdir3/file3.txt',
+      'indirect-external-link.txt => external-link.txt',
+      'local-dir-link => normal-dir',
+      'local-link.txt => normal-file.txt',
+      'normal-dir (D)',
+      '    file-in-subdir.txt',
+      'normal-file.txt'
+    ]);
+    test.done();
+  },
+
+  'External: follow only external symlinks'(test: Test) {
+    // GIVEN
+    const outdir = fs.mkdtempSync(path.join(os.tmpdir(), 'copy-tests'));
+
+    // WHEN
+    copyDirectory(path.join(__dirname, 'test.fs.fixtures', 'symlinks'), outdir, {
+      follow: FollowMode.External
+    });
+
+    // THEN
+    test.deepEqual(tree(outdir), [
+      'external-dir-link (D)',
+      '    file2.txt',
+      'external-link.txt',
+      'indirect-external-link.txt => external-link.txt',
+      'local-dir-link => normal-dir',
+      'local-link.txt => normal-file.txt',
+      'normal-dir (D)',
+      '    file-in-subdir.txt',
+      'normal-file.txt'
+    ]);
+
+    test.done();
+  },
+
+  'exclude'(test: Test) {
+    // GIVEN
+    const outdir = fs.mkdtempSync(path.join(os.tmpdir(), 'copy-tests'));
+
+    // WHEN
+    copyDirectory(path.join(__dirname, 'test.fs.fixtures', 'test1'), outdir, {
+      exclude: [
+        '*',
+        '!subdir2',
+        '!subdir2/**/*',
+        '.*'
+      ]
+    });
+
+    // THEN
+    test.deepEqual(tree(outdir), [
+      'subdir2 (D)',
+      '    empty-subdir (D)',
+      '    subdir3 (D)',
+      '        file3.txt'
+    ]);
+    test.done();
+  },
+};
+
+function tree(dir: string, depth = ''): string[] {
+  const lines = [];
+  for (const file of fs.readdirSync(dir).sort()) {
+    const filePath = path.join(dir, file);
+    const stat = fs.lstatSync(filePath);
+    if (stat.isSymbolicLink()) {
+      const linkDest = fs.readlinkSync(filePath);
+      lines.push(depth + file + ' => ' + linkDest);
+    } else if (stat.isDirectory()) {
+      lines.push(depth + file + ' (D)');
+      lines.push(...tree(filePath, depth + '    '));
+    } else {
+      lines.push(depth + file);
+    }
+  }
+  return lines;
+}
\ No newline at end of file
diff --git a/packages/@aws-cdk/assets/test/test.fs-fingerprint.ts b/packages/@aws-cdk/assets/test/test.fs-fingerprint.ts
new file mode 100644
index 0000000000000..24febda18af46
--- /dev/null
+++ b/packages/@aws-cdk/assets/test/test.fs-fingerprint.ts
@@ -0,0 +1,108 @@
+import fs = require('fs');
+import { Test } from 'nodeunit';
+import os = require('os');
+import path = require('path');
+import { copyDirectory } from '../lib/fs-copy';
+import { fingerprint } from '../lib/fs-fingerprint';
+
+export = {
+  'single file'(test: Test) {
+    // GIVEN
+    const workdir = fs.mkdtempSync(path.join(os.tmpdir(), 'hash-tests'));
+    const content = 'Hello, world!';
+    const input1 = path.join(workdir, 'input1.txt');
+    const input2 = path.join(workdir, 'input2.txt');
+    const input3 = path.join(workdir, 'input3.txt');
+    fs.writeFileSync(input1, content);
+    fs.writeFileSync(input2, content);
+    fs.writeFileSync(input3, content + '.'); // add one character, hash should be different
+
+    // WHEN
+    const hash1 = fingerprint(input1);
+    const hash2 = fingerprint(input2);
+    const hash3 = fingerprint(input3);
+
+    // THEN
+    test.deepEqual(hash1, hash2);
+    test.notDeepEqual(hash3, hash1);
+    test.done();
+  },
+
+  'empty file'(test: Test) {
+    // GIVEN
+    const workdir = fs.mkdtempSync(path.join(os.tmpdir(), 'hash-tests'));
+    const input1 = path.join(workdir, 'empty');
+    const input2 = path.join(workdir, 'empty');
+    fs.writeFileSync(input1, '');
+    fs.writeFileSync(input2, '');
+
+    // WHEN
+    const hash1 = fingerprint(input1);
+    const hash2 = fingerprint(input2);
+
+    // THEN
+    test.deepEqual(hash1, hash2);
+    test.done();
+  },
+
+  'directory'(test: Test) {
+    // GIVEN
+    const srcdir = path.join(__dirname, 'test.fs.fixtures', 'symlinks');
+    const outdir = fs.mkdtempSync(path.join(os.tmpdir(), 'copy-tests'));
+    copyDirectory(srcdir, outdir);
+
+    // WHEN
+    const hashSrc = fingerprint(srcdir);
+    const hashCopy = fingerprint(outdir);
+
+    // THEN
+    test.deepEqual(hashSrc, hashCopy);
+    test.done();
+  },
+
+  'directory, rename files (fingerprint should change)'(test: Test) {
+    // GIVEN
+    const srcdir = path.join(__dirname, 'test.fs.fixtures', 'symlinks');
+    const cpydir = fs.mkdtempSync(path.join(os.tmpdir(), 'fingerprint-tests'));
+    copyDirectory(srcdir, cpydir);
+
+    // be careful not to break a symlink
+    fs.renameSync(path.join(cpydir, 'normal-dir', 'file-in-subdir.txt'), path.join(cpydir, 'move-me.txt'));
+
+    // WHEN
+    const hashSrc = fingerprint(srcdir);
+    const hashCopy = fingerprint(cpydir);
+
+    // THEN
+    test.notDeepEqual(hashSrc, hashCopy);
+    test.done();
+  },
+
+  'external symlink content changes (fingerprint should change)'(test: Test) {
+    // GIVEN
+    const dir1 = fs.mkdtempSync(path.join(os.tmpdir(), 'fingerprint-tests'));
+    const dir2 = fs.mkdtempSync(path.join(os.tmpdir(), 'fingerprint-tests'));
+    const target = path.join(dir1, 'boom.txt');
+    const content = 'boom';
+    fs.writeFileSync(target, content);
+    fs.symlinkSync(target, path.join(dir2, 'link-to-boom.txt'));
+
+    // now dir2 contains a symlink to a file in dir1
+
+    // WHEN
+    const original = fingerprint(dir2);
+
+    // now change the contents of the target
+    fs.writeFileSync(target, 'changning you!');
+    const afterChange = fingerprint(dir2);
+
+    // revert the content to original and expect hash to be reverted
+    fs.writeFileSync(target, content);
+    const afterRevert = fingerprint(dir2);
+
+    // THEN
+    test.notDeepEqual(original, afterChange);
+    test.deepEqual(afterRevert, original);
+    test.done();
+  }
+};
diff --git a/packages/@aws-cdk/cdk-build/.gitignore b/packages/@aws-cdk/cdk-build/.gitignore
new file mode 100644
index 0000000000000..6d61368bb8512
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/.gitignore
@@ -0,0 +1,14 @@
+*.js
+*.d.ts
+tsconfig.json
+tslint.json
+*.js.map
+dist
+coverage
+.nyc_output
+.jsii
+
+.LAST_BUILD
+.nycrc
+.LAST_PACKAGE
+*.snk
\ No newline at end of file
diff --git a/packages/@aws-cdk/cdk-build/.npmignore b/packages/@aws-cdk/cdk-build/.npmignore
new file mode 100644
index 0000000000000..5e482731ecbf0
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/.npmignore
@@ -0,0 +1,19 @@
+# Don't include original .ts files when doing `npm pack`
+*.ts
+!*.d.ts
+coverage
+.nyc_output
+*.tgz
+
+dist
+.LAST_PACKAGE
+.LAST_BUILD
+!*.js
+
+# Include .jsii
+!.jsii
+
+*.snk
+
+# Work around npm@6.8.0 ignoring 'core' by default -- https://github.com/npm/npm-packlist/issues/24
+!core
diff --git a/packages/@aws-cdk/cdk-build/LICENSE b/packages/@aws-cdk/cdk-build/LICENSE
new file mode 100644
index 0000000000000..46c185646b439
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
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+      to the Licensor or its representatives, including but not limited to
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+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
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+      Work and such Derivative Works in Source or Object form.
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+   3. Grant of Patent License. Subject to the terms and conditions of
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+   4. Redistribution. You may reproduce and distribute copies of the
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+          do not modify the License. You may add Your own attribution
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+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
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+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
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+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
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+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
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+   7. Disclaimer of Warranty. Unless required by applicable law or
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+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/packages/@aws-cdk/cdk-build/NOTICE b/packages/@aws-cdk/cdk-build/NOTICE
new file mode 100644
index 0000000000000..8585168af8b7d
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/NOTICE
@@ -0,0 +1,2 @@
+AWS Cloud Development Kit (AWS CDK)
+Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
diff --git a/packages/@aws-cdk/cdk-build/README.md b/packages/@aws-cdk/cdk-build/README.md
new file mode 100644
index 0000000000000..7f32ceb721753
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/README.md
@@ -0,0 +1,92 @@
+# cdk-build
+
+A jsii library and a command-line tool which takes a CDK `build.json` file (as
+defined in cx-api) and executes all the build tasks in topological order.
+
+For example, say we have the following directory structure:
+
+```
+.
+├── build.json
+└── staging
+    └── dir1
+        └── file1.txt
+```
+
+And `build.json` looks like this:
+
+```json
+{
+  "steps": {
+    "zip_dir1": {
+      "type": "zip",
+      "parameters": {
+        "src": "staging/dir1",
+        "dest": "output/aaabbb.zip"
+      }
+    },
+    "dup_zip_result": {
+      "type": "copy",
+      "parameters": {
+        "src": "output/aaabbb.zip",
+        "dest": "output/dup.zip"
+      },
+      "depends": [ "zip_dir1" ]
+    }
+  }
+}
+```
+
+The, if we run `cdk-build` in this directory:
+
+```console
+$ cdk-build .
+zip_dir1: start build
+zip_dir1: compressing staging/dir1 to output/aaabbb.zip
+zip_dir1: end build
+dup_zip_result: start build
+dup_zip_result: copying output/aaabbb.zip to output/dup.zip
+dup_zip_result: end build
+```
+
+And it will produce the following output:
+
+```
+.
+├── build.json
+├── output
+│   ├── aaabbb.zip
+│   └── dup.zip
+└── staging
+    └── dir1
+        └── file1.txt
+```
+
+`cdk-build` assumes that if a destination file (or docker image tag) already exists,
+it can skip it. This works in tandem with how CDK identifies artifacts (based on their source fingerprint).
+
+```console
+$ cdk-build .
+zip_dir1: start build
+zip_dir1: output/aaabbb.zip already exists. skipping
+zip_dir1: end build
+dup_zip_result: start build
+dup_zip_result: output/dup.zip already exists. skipping
+dup_zip_result: end build
+```
+
+## Supported Tasks
+
+ * `copy`: copies files
+ * `zip`: zips a directory
+ * `docker`: builds a docker image
+
+## TODO
+
+- [ ] Integrate into the toolkit (required "cdk-deploy").
+- [ ] The docker build in the toolkit has an optimization for CI environments
+      where it pulls down a cached image. This really breaks the boundary of
+      this tool. Need to figure out what to do.
+- [ ] Implement `cdk-deploy`, the next guy in the chain. It should pick up an
+      `assembly` directory (with `manifest.json` and build outputs) and deploy
+      it.
diff --git a/packages/@aws-cdk/cdk-build/bin/cdk-build b/packages/@aws-cdk/cdk-build/bin/cdk-build
new file mode 100755
index 0000000000000..9cfe1d239ec1e
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/bin/cdk-build
@@ -0,0 +1,3 @@
+#!/usr/bin/env node
+// tslint:disable-next-line:no-var-requires
+require('./cdk-build.js');
diff --git a/packages/@aws-cdk/cdk-build/bin/cdk-build.ts b/packages/@aws-cdk/cdk-build/bin/cdk-build.ts
new file mode 100644
index 0000000000000..42b97d8d33639
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/bin/cdk-build.ts
@@ -0,0 +1,20 @@
+import { Build } from '../lib/build';
+
+// tslint:disable:no-console
+
+async function main() {
+  const rootdir = process.argv[2];
+  if (!rootdir || process.argv.length !== 3) {
+    console.error('Usage: cdk-build <outdir>');
+    process.exit(1);
+    return;
+  }
+
+  const build = new Build({ root: rootdir });
+  await build.build();
+}
+
+main().catch(e => {
+  console.error(e);
+  process.exit(1);
+});
diff --git a/packages/@aws-cdk/cdk-build/lib/build.ts b/packages/@aws-cdk/cdk-build/lib/build.ts
new file mode 100644
index 0000000000000..a7e36958073f2
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/lib/build.ts
@@ -0,0 +1,44 @@
+// tslint:disable:no-console
+import cxapi = require('@aws-cdk/cx-api');
+import fs = require('fs-extra');
+import path = require('path');
+import { Manifest } from './manifest';
+
+export interface BuildOptions {
+  root: string;
+}
+
+export class Build {
+  constructor(private readonly options: BuildOptions) {
+
+  }
+
+  public async build() {
+    const manifestJson = await this.readBuildManifest();
+    if (!manifestJson) {
+      return; // no-op
+    }
+
+    const manifest = new Manifest(manifestJson);
+    const session = manifest.createSession();
+
+    const restore = process.cwd();
+    process.chdir(this.options.root);
+    try {
+      await session.build();
+    } finally {
+      process.chdir(restore);
+    }
+  }
+
+  private async readBuildManifest() {
+    const manifestFile = path.join(this.options.root, cxapi.BUILD_FILE);
+
+    // no-op if build.json is not there
+    if (!await fs.pathExists(manifestFile)) {
+      return undefined;
+    }
+
+    return JSON.parse((await fs.readFile(manifestFile)).toString()) as cxapi.BuildManifest;
+  }
+}
diff --git a/packages/@aws-cdk/cdk-build/lib/index.ts b/packages/@aws-cdk/cdk-build/lib/index.ts
new file mode 100644
index 0000000000000..4125b1b18fb52
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/lib/index.ts
@@ -0,0 +1 @@
+export * from './task';
diff --git a/packages/@aws-cdk/cdk-build/lib/manifest.ts b/packages/@aws-cdk/cdk-build/lib/manifest.ts
new file mode 100644
index 0000000000000..1f8ae30b1c4d6
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/lib/manifest.ts
@@ -0,0 +1,46 @@
+import cxapi = require('@aws-cdk/cx-api');
+import { BuildSession } from './session';
+import { Task, TaskConstructor } from './task';
+
+export class Manifest {
+  constructor(private readonly manifest: cxapi.BuildManifest) {
+  }
+
+  public createSession() {
+    const manifest = this.manifest;
+    const session = new BuildSession();
+    const tasks: { [id: string]: Task } = {};
+
+    for (const [ id, step ] of Object.entries(manifest.steps)) {
+      const TaskClass = getTaskClass(step.type);
+      const task = new TaskClass(id, step.parameters);
+      tasks[id] = task;
+      session.addTask(task);
+    }
+
+    // now that we've added all tasks, let's map the dependencies
+    for (const [ id, step ] of Object.entries(manifest.steps)) {
+      for (const depid of step.depends || []) {
+        const consumer = tasks[id];
+        const dep = tasks[depid];
+
+        if (!consumer) {
+          throw new Error(`Unexpected`);
+        }
+
+        if (!dep) {
+          throw new Error(`Step ${id} defines a dependency on ${depid} which doesn't exist`);
+        }
+
+        consumer.addDependency(dep);
+      }
+    }
+
+    return session;
+  }
+}
+
+function getTaskClass(type: string): TaskConstructor {
+  const cls = require(`./tasks/${type}`).default;
+  return cls;
+}
diff --git a/packages/@aws-cdk/cdk-build/lib/session.ts b/packages/@aws-cdk/cdk-build/lib/session.ts
new file mode 100644
index 0000000000000..e572c24583fc2
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/lib/session.ts
@@ -0,0 +1,45 @@
+// tslint:disable:no-console
+import { Task } from './task';
+
+export class BuildSession {
+  private readonly tasks: { [id: string]: Task } = {};
+
+  public addTask(task: Task) {
+    if (task.id in this.tasks) {
+      throw new Error(`There is already a task ${task.id}`);
+    }
+
+    this.tasks[task.id] = task;
+  }
+
+  public async build() {
+    while (!this.completed) {
+      for (const task of this.ready) {
+        console.error(`${task.id}: start build`);
+        await task.build();
+        console.error(`${task.id}: end build`);
+      }
+    }
+  }
+
+  /**
+   * Returns all tasks that did not complete yet
+   */
+  public get pending() {
+    return Object.values(this.tasks).filter(t => !t.completed).sort((t1, t2) => t1.id.localeCompare(t2.id));
+  }
+
+  /**
+   * Returns true if the session is complete (no pending tasks)
+   */
+  public get completed() {
+    return this.pending.length === 0;
+  }
+
+  /**
+   * Returns all the tasks that are ready to be built ("!complete" && "ready")
+   */
+  public get ready() {
+    return Object.values(this.tasks).filter(t => t.ready && !t.completed).sort((t1, t2) => t1.id.localeCompare(t2.id));
+  }
+}
diff --git a/packages/@aws-cdk/cdk-build/lib/task.ts b/packages/@aws-cdk/cdk-build/lib/task.ts
new file mode 100644
index 0000000000000..d5c3d5a3d1f2d
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/lib/task.ts
@@ -0,0 +1,54 @@
+/**
+ * Represents a build task
+ */
+export abstract class Task {
+  private depends = new Array<Task>(); // IDs of tasks remining that this task still depends on
+  private _completed = false;
+
+  constructor(public readonly id: string) {
+
+  }
+
+  /**
+   * Indicates that `depedency` must be built before this task.
+   */
+  public addDependency(depedency: Task) {
+    this.depends.push(depedency);
+  }
+
+  public get completed() {
+    return this._completed;
+  }
+
+  public get waiting() {
+    return this.depends.filter(d => !d.completed);
+  }
+
+  public get ready() {
+    return this.waiting.length === 0;
+  }
+
+  public async build() {
+    if (!this.ready) {
+      throw new Error(`Can't start build, waiting for the following tasks to complete: ${this.waiting.map(t => t.id)}`);
+    }
+
+    const ret = await this.execute();
+
+    this._completed = true;
+    return ret;
+  }
+
+  /**
+   * Executes builds for the current task.
+   * @returns `true` if the build actually happened, and `false` for no-op (in case of a cached result)
+   */
+  protected abstract async execute(): Promise<boolean>;
+
+  protected debug(...args: any[]) {
+    // tslint:disable-next-line:no-console
+    console.error(this.id + ':', ...args);
+  }
+}
+
+export type TaskConstructor = new(id: string, options: { [key: string]: any }) => Task;
\ No newline at end of file
diff --git a/packages/@aws-cdk/cdk-build/lib/tasks/copy.ts b/packages/@aws-cdk/cdk-build/lib/tasks/copy.ts
new file mode 100644
index 0000000000000..773a13e58f67a
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/lib/tasks/copy.ts
@@ -0,0 +1,29 @@
+import fs = require('fs-extra');
+import path = require('path');
+import { Task } from '../task';
+
+export interface CopyTaskOptions {
+  src: string;
+  dest: string;
+}
+
+/**
+ * Copies files.
+ */
+export default class CopyTask extends Task {
+  constructor(id: string, private readonly options: CopyTaskOptions) {
+    super(id);
+  }
+
+  public async execute() {
+    if (await fs.pathExists(this.options.dest)) {
+      this.debug(`${this.options.dest} already exists. skipping`);
+      return false;
+    }
+
+    this.debug(`copying ${this.options.src} to ${this.options.dest}`);
+    await fs.mkdirs(path.dirname(this.options.dest));
+    await fs.copy(this.options.src, this.options.dest);
+    return true;
+  }
+}
diff --git a/packages/@aws-cdk/cdk-build/lib/tasks/docker.ts b/packages/@aws-cdk/cdk-build/lib/tasks/docker.ts
new file mode 100644
index 0000000000000..adf2f6d9fae03
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/lib/tasks/docker.ts
@@ -0,0 +1,66 @@
+import { Task } from '../task';
+import { shell } from '../util';
+
+export interface DockerTaskOptions {
+  /**
+   * Docker build context directory (where `Dockerfile` is).
+   */
+  dir: string;
+
+  /**
+   * The tag to use for the resulting image.
+   */
+  tag: string;
+
+  /**
+   * Docker implementation, can be used to mock the docker shell execution.
+   */
+  docker?: IDocker
+}
+
+/**
+ * Builds Docker images.
+ */
+export default class DockerTask extends Task {
+  private readonly docker: IDocker;
+
+  constructor(id: string, private readonly options: DockerTaskOptions) {
+    super(id);
+
+    this.docker = options.docker || new Docker();
+  }
+
+  public async execute() {
+    const tag = this.options.tag;
+
+    this.debug(`checking if a docker image with tag ${tag} already exists`);
+    const output = (await this.docker.exec('images', '-q', tag)).trim();
+
+    if (output.length > 0) {
+      this.debug(`docker image ${tag} already exists`);
+      return false;
+    }
+
+    this.debug(`building docker image ${this.options.tag} from ${this.options.dir}`);
+    await this.docker.exec('build', '--tag', this.options.tag, this.options.dir);
+    return true;
+  }
+}
+
+export interface IDocker {
+  exec(...args: string[]): Promise<string>;
+}
+
+class Docker implements IDocker {
+  public async exec(...args: string[]) {
+    try {
+      return await shell(['docker', ...args]);
+    } catch (e) {
+      if (e.code === 'ENOENT') {
+        // tslint:disable-next-line:max-line-length
+        throw new Error('Error building Docker image asset; you need to have Docker installed in order to be able to build image assets. Please install Docker and try again.');
+      }
+      throw e;
+    }
+  }
+}
\ No newline at end of file
diff --git a/packages/@aws-cdk/cdk-build/lib/tasks/zip.ts b/packages/@aws-cdk/cdk-build/lib/tasks/zip.ts
new file mode 100644
index 0000000000000..45fcd1cc71b80
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/lib/tasks/zip.ts
@@ -0,0 +1,62 @@
+import archiver = require('archiver');
+import crypto = require('crypto');
+import fs = require('fs-extra');
+import path = require('path');
+import { Task } from '../task';
+
+export interface ZipTaskOptions {
+  /**
+   * Source directory to archive.
+   */
+  src: string;
+
+  /**
+   * Where to put the resulting zip archive.
+   */
+  dest: string;
+}
+
+export default class ZipTask extends Task {
+  constructor(id: string, private readonly options: ZipTaskOptions) {
+    super(id);
+    return;
+  }
+
+  public async execute() {
+    if (await fs.pathExists(this.options.dest)) {
+      this.debug(`${this.options.dest} already exists. skipping`);
+      return false;
+    }
+    this.debug(`compressing ${this.options.src} to ${this.options.dest}`);
+    await fs.mkdirs(path.dirname(this.options.dest));
+    await zipDirectory(this.options.src, this.options.dest);
+    return true;
+  }
+}
+
+export function zipDirectory(directory: string, outputFile: string): Promise<void> {
+  return new Promise((ok, fail) => {
+    const output = fs.createWriteStream(outputFile);
+    const archive = archiver('zip');
+    // The below options are needed to support following symlinks when building zip files:
+    // -  nodir: This will prevent symlinks themselves from being copied into the zip.
+    // - follow: This will follow symlinks and copy the files within.
+    const globOptions = {
+      dot: true,
+      nodir: true,
+      follow: true,
+      cwd: directory
+    };
+    archive.glob('**', globOptions);
+    archive.pipe(output);
+    archive.finalize();
+
+    archive.on('warning', fail);
+    archive.on('error', fail);
+    output.once('close', () => ok());
+  });
+}
+
+export function md5hash(data: any) {
+  return crypto.createHash('sha256').update(data).digest('hex');
+}
diff --git a/packages/@aws-cdk/cdk-build/lib/util.ts b/packages/@aws-cdk/cdk-build/lib/util.ts
new file mode 100644
index 0000000000000..32798291482be
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/lib/util.ts
@@ -0,0 +1,97 @@
+import child_process = require("child_process");
+
+export interface ShellOptions extends child_process.SpawnOptions {
+  quiet?: boolean;
+}
+
+/**
+ * OS helpers
+ *
+ * Shell function which both prints to stdout and collects the output into a
+ * string.
+ */
+export async function shell(command: string[], options: ShellOptions = {}): Promise<string> {
+  const child = child_process.spawn(command[0], command.slice(1), {
+    ...options,
+    stdio: [ 'ignore', 'pipe', 'inherit' ]
+  });
+
+  return new Promise<string>((resolve, reject) => {
+    const stdout = new Array<any>();
+
+    // Both write to stdout and collect
+    if (child.stdout) {
+      child.stdout.on('data', chunk => {
+        if (!options.quiet) {
+          process.stdout.write(chunk);
+        }
+        stdout.push(chunk);
+      });
+    }
+
+    child.once('error', reject);
+
+    child.once('exit', code => {
+      if (code === 0) {
+        resolve(Buffer.concat(stdout).toString('utf-8'));
+      } else {
+        reject(new Error(`${renderCommandLine(command)} exited with error code ${code}`));
+      }
+    });
+  });
+}
+
+/**
+ * Render the given command line as a string
+ *
+ * Probably missing some cases but giving it a good effort.
+ */
+function renderCommandLine(cmd: string[]) {
+  if (process.platform !== 'win32') {
+    return doRender(cmd, hasAnyChars(' ', '\\', '!', '"', "'", '&', '$'), posixEscape);
+  } else {
+    return doRender(cmd, hasAnyChars(' ', '"', '&', '^', '%'), windowsEscape);
+  }
+}
+
+/**
+ * Render a UNIX command line
+ */
+function doRender(cmd: string[], needsEscaping: (x: string) => boolean, doEscape: (x: string) => string): string {
+  return cmd.map(x => needsEscaping(x) ? doEscape(x) : x).join(' ');
+}
+
+/**
+ * Return a predicate that checks if a string has any of the indicated chars in it
+ */
+function hasAnyChars(...chars: string[]): (x: string) => boolean {
+  return (str: string) => {
+    return chars.some(c => str.indexOf(c) !== -1);
+  };
+}
+
+/**
+ * Escape a shell argument for POSIX shells
+ *
+ * Wrapping in single quotes and escaping single quotes inside will do it for us.
+ */
+function posixEscape(x: string) {
+  // Turn ' -> '"'"'
+  x = x.replace("'", "'\"'\"'");
+  return `'${x}'`;
+}
+
+/**
+ * Escape a shell argument for cmd.exe
+ *
+ * This is how to do it right, but I'm not following everything:
+ *
+ * https://blogs.msdn.microsoft.com/twistylittlepassagesallalike/2011/04/23/everyone-quotes-command-line-arguments-the-wrong-way/
+ */
+function windowsEscape(x: string): string {
+  // First surround by double quotes, ignore the part about backslashes
+  x = `"${x}"`;
+  // Now escape all special characters
+  const shellMeta = new Set<string>(['"', '&', '^', '%']);
+  return x.split('').map(c => shellMeta.has(x) ? '^' + c : c).join('');
+}
diff --git a/packages/@aws-cdk/cdk-build/package-lock.json b/packages/@aws-cdk/cdk-build/package-lock.json
new file mode 100644
index 0000000000000..ce47594702807
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/package-lock.json
@@ -0,0 +1,5287 @@
+{
+	"name": "@aws-cdk/cdk-build",
+	"version": "0.25.0",
+	"lockfileVersion": 1,
+	"requires": true,
+	"dependencies": {
+		"@babel/code-frame": {
+			"version": "7.0.0",
+			"resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
+			"integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+			"dev": true,
+			"requires": {
+				"@babel/highlight": "^7.0.0"
+			}
+		},
+		"@babel/core": {
+			"version": "7.3.4",
+			"resolved": "https://registry.npmjs.org/@babel/core/-/core-7.3.4.tgz",
+			"integrity": "sha512-jRsuseXBo9pN197KnDwhhaaBzyZr2oIcLHHTt2oDdQrej5Qp57dCCJafWx5ivU8/alEYDpssYqv1MUqcxwQlrA==",
+			"dev": true,
+			"requires": {
+				"@babel/code-frame": "^7.0.0",
+				"@babel/generator": "^7.3.4",
+				"@babel/helpers": "^7.2.0",
+				"@babel/parser": "^7.3.4",
+				"@babel/template": "^7.2.2",
+				"@babel/traverse": "^7.3.4",
+				"@babel/types": "^7.3.4",
+				"convert-source-map": "^1.1.0",
+				"debug": "^4.1.0",
+				"json5": "^2.1.0",
+				"lodash": "^4.17.11",
+				"resolve": "^1.3.2",
+				"semver": "^5.4.1",
+				"source-map": "^0.5.0"
+			}
+		},
+		"@babel/generator": {
+			"version": "7.3.4",
+			"resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.3.4.tgz",
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+			"version": "11.1.1",
+			"resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+			"integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
+			"dev": true,
+			"requires": {
+				"camelcase": "^5.0.0",
+				"decamelize": "^1.2.0"
+			}
+		},
+		"zip-stream": {
+			"version": "2.0.1",
+			"resolved": "https://registry.npmjs.org/zip-stream/-/zip-stream-2.0.1.tgz",
+			"integrity": "sha512-c+eUhhkDpaK87G/py74wvWLtz2kzMPNCCkUApkun50ssE0oQliIQzWpTnwjB+MTKVIf2tGzIgHyqW/Y+W77ecQ==",
+			"requires": {
+				"archiver-utils": "^2.0.0",
+				"compress-commons": "^1.2.0",
+				"readable-stream": "^2.0.0"
+			}
+		}
+	}
+}
diff --git a/packages/@aws-cdk/cdk-build/package.json b/packages/@aws-cdk/cdk-build/package.json
new file mode 100644
index 0000000000000..7fe264bb71196
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/package.json
@@ -0,0 +1,82 @@
+{
+  "name": "@aws-cdk/cdk-build",
+  "version": "0.25.0",
+  "description": "CDK build system",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
+  "bin": {
+    "cdk-build": "bin/cdk-build.js"
+  },
+  "jsii": {
+    "outdir": "dist",
+    "targets": {
+      "java": {
+        "package": "software.amazon.awscdk.build",
+        "maven": {
+          "groupId": "software.amazon.awscdk",
+          "artifactId": "cdk-build"
+        }
+      },
+      "dotnet": {
+        "namespace": "Amazon.CDK.Build",
+        "packageId": "Amazon.CDK.Build",
+        "signAssembly": true,
+        "assemblyOriginatorKeyFile": "../../key.snk"
+      },
+      "sphinx": {}
+    }
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/awslabs/aws-cdk.git"
+  },
+  "scripts": {
+    "build": "cdk-build",
+    "watch": "cdk-watch",
+    "lint": "cdk-lint",
+    "test": "jest",
+    "pkglint": "pkglint -f",
+    "package": "cdk-package",
+    "awslint": "cdk-awslint"
+  },
+  "keywords": [
+    "aws",
+    "cdk",
+    "build",
+    "toolkit",
+    "jsii",
+    "cdk-core"
+  ],
+  "author": {
+    "name": "Amazon Web Services",
+    "url": "https://aws.amazon.com",
+    "organization": true
+  },
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "@types/archiver": "^2.1.2",
+    "@types/fs-extra": "^5.0.5",
+    "@types/jest": "^24.0.9",
+    "@types/unzip": "^0.1.1",
+    "cdk-build-tools": "^0.28.0",
+    "jest": "^24.1.0",
+    "pkglint": "^0.28.0",
+    "unzip": "^0.1.11"
+  },
+  "dependencies": {
+    "@aws-cdk/cx-api": "^0.28.0",
+    "archiver": "^3.0.0",
+    "fs-extra": "^7.0.1"
+  },
+  "bundledDependencies": [
+    "archiver",
+    "fs-extra"
+  ],
+  "homepage": "https://github.com/awslabs/aws-cdk",
+  "peerDependencies": {
+    "@aws-cdk/cx-api": "^0.28.0"
+  },
+  "engines": {
+    "node": ">= 8.10.0"
+  }
+}
diff --git a/packages/@aws-cdk/cdk-build/test/build.test.ts b/packages/@aws-cdk/cdk-build/test/build.test.ts
new file mode 100644
index 0000000000000..856b60c47cdd1
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/build.test.ts
@@ -0,0 +1,96 @@
+import cxapi = require('@aws-cdk/cx-api');
+import fs = require('fs-extra');
+import os = require('os');
+import path = require('path');
+import { Build } from '../lib/build';
+import { createTree, snapshotTree, decompress } from './util';
+
+test('no build.json', async () => {
+  const root = await createTree({
+    'file1.txt': { boom: 123 }
+  });
+
+  const build = new Build({ root });
+  await build.build();
+});
+
+test('a single build step', async () => {
+  // GIVEN
+  const root = await createTree({
+    'source-file.txt': 'this is the source file',
+    'build.json': {
+      steps: {
+        s1: {
+          type: 'copy',
+          parameters: {
+            src: 'source-file.txt',
+            dest: 'output/dest-file.txt'
+          }
+        }
+      }
+    } as cxapi.BuildManifest
+  });
+
+  // WHEN
+  const build = new Build({ root });
+  await build.build();
+
+  // THEN
+  expect(snapshotTree(path.join(root, 'output'))).toEqual({
+    'dest-file.txt': 'this is the source file'
+  });
+});
+
+test('multiple build steps with deps', async () => {
+  // GIVEN
+  const content = 'hello, this is source';
+  const root = await createTree({
+    'source.txt': content,
+    'build.json': {
+      steps: {
+        source_to_dest1: {
+          type: 'copy',
+          parameters: {
+            src: 'source.txt',
+            dest: 'output/dest1.txt'
+          }
+        },
+        dest1_to_dest2: {
+          type: 'copy',
+          depends: [ 'source_to_dest1' ],
+          parameters: {
+            src: 'output/dest1.txt',
+            dest: 'output/dest2.txt'
+          }
+        }
+      }
+    }
+  });
+
+  const build = new Build({ root });
+  await build.build();
+
+  expect(snapshotTree(path.join(root, 'output'))).toEqual({
+    'dest1.txt': content,
+    'dest2.txt': content
+  });
+});
+
+test('full scenario', async () => {
+  const src = path.join(__dirname, 'fixtures', 'example');
+  const root = await fs.mkdtemp(os.tmpdir());
+  await fs.copy(src, root, { recursive: true });
+
+  const build = new Build({ root });
+  await build.build();
+
+  expect(await fs.pathExists(path.join(root, 'output', 'aaabbb.zip'))).toBeTruthy();
+  expect(await fs.pathExists(path.join(root, 'output', 'dup.zip'))).toBeTruthy();
+
+  const decom = await fs.mkdtemp(os.tmpdir());
+
+  await decompress(path.join(root, 'output', 'dup.zip'), decom);
+  expect(snapshotTree(decom)).toEqual({
+    'file1.txt': 'dir1/file1.txt'
+  });
+});
\ No newline at end of file
diff --git a/packages/@aws-cdk/cdk-build/test/fixtures/dir1/file1.txt b/packages/@aws-cdk/cdk-build/test/fixtures/dir1/file1.txt
new file mode 120000
index 0000000000000..4e7feb2d8cbaf
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/fixtures/dir1/file1.txt
@@ -0,0 +1 @@
+../file1.txt
\ No newline at end of file
diff --git a/packages/@aws-cdk/cdk-build/test/fixtures/dir1/file2.txt b/packages/@aws-cdk/cdk-build/test/fixtures/dir1/file2.txt
new file mode 100644
index 0000000000000..e63748e7128af
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/fixtures/dir1/file2.txt
@@ -0,0 +1 @@
+this is file #2
diff --git a/packages/@aws-cdk/cdk-build/test/fixtures/dir1/subdir1/file3.txt b/packages/@aws-cdk/cdk-build/test/fixtures/dir1/subdir1/file3.txt
new file mode 100644
index 0000000000000..873fb8d667d05
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/fixtures/dir1/subdir1/file3.txt
@@ -0,0 +1 @@
+file3
\ No newline at end of file
diff --git a/packages/@aws-cdk/cdk-build/test/fixtures/example/build.json b/packages/@aws-cdk/cdk-build/test/fixtures/example/build.json
new file mode 100644
index 0000000000000..dfbb770ac323e
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/fixtures/example/build.json
@@ -0,0 +1,19 @@
+{
+  "steps": {
+    "zip_dir1": {
+      "type": "zip",
+      "parameters": {
+        "src": "staging/dir1",
+        "dest": "output/aaabbb.zip"
+      }
+    },
+    "dup_zip_result": {
+      "type": "copy",
+      "parameters": {
+        "src": "output/aaabbb.zip",
+        "dest": "output/dup.zip"
+      },
+      "depends": [ "zip_dir1" ]
+    }
+  }
+}
diff --git a/packages/@aws-cdk/cdk-build/test/fixtures/example/output/aaabbb.zip b/packages/@aws-cdk/cdk-build/test/fixtures/example/output/aaabbb.zip
new file mode 100644
index 0000000000000..9b6bb63271fc3
Binary files /dev/null and b/packages/@aws-cdk/cdk-build/test/fixtures/example/output/aaabbb.zip differ
diff --git a/packages/@aws-cdk/cdk-build/test/fixtures/example/output/dup.zip b/packages/@aws-cdk/cdk-build/test/fixtures/example/output/dup.zip
new file mode 100644
index 0000000000000..9b6bb63271fc3
Binary files /dev/null and b/packages/@aws-cdk/cdk-build/test/fixtures/example/output/dup.zip differ
diff --git a/packages/@aws-cdk/cdk-build/test/fixtures/example/staging/dir1/file1.txt b/packages/@aws-cdk/cdk-build/test/fixtures/example/staging/dir1/file1.txt
new file mode 100644
index 0000000000000..025c119ec25ea
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/fixtures/example/staging/dir1/file1.txt
@@ -0,0 +1 @@
+dir1/file1.txt
diff --git a/packages/@aws-cdk/cdk-build/test/fixtures/file1.txt b/packages/@aws-cdk/cdk-build/test/fixtures/file1.txt
new file mode 100644
index 0000000000000..18eab6cd4a1fb
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/fixtures/file1.txt
@@ -0,0 +1 @@
+This is a file which we will use for tests.
diff --git a/packages/@aws-cdk/cdk-build/test/manifest.test.ts b/packages/@aws-cdk/cdk-build/test/manifest.test.ts
new file mode 100644
index 0000000000000..97eb9f19cb078
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/manifest.test.ts
@@ -0,0 +1,57 @@
+import { Manifest } from '../lib/manifest';
+import CopyTask from '../lib/tasks/copy';
+import DockerTask from '../lib/tasks/docker';
+import ZipTask from '../lib/tasks/zip';
+
+test('create session from manifest', () => {
+  const manifest = new Manifest({
+    steps: {
+      copyStep: {
+        type: 'copy',
+        parameters: {
+          src: 'from',
+          dest: 'to'
+        }
+      },
+      zipStep: {
+        type: 'zip',
+        parameters: {
+          src: 'src',
+          dest: 'dest'
+        }
+      },
+      dockerStep: {
+        type: 'docker',
+        parameters: {
+          dir: 'dir',
+          tag: 'tag'
+        }
+      }
+    }
+  });
+
+  const session = manifest.createSession();
+  expect(session.pending.map(x => x.id)).toEqual([ 'copyStep', 'dockerStep', 'zipStep' ]);
+  expect(session.pending[0]).toBeInstanceOf(CopyTask);
+  expect(session.pending[1]).toBeInstanceOf(DockerTask);
+  expect(session.pending[2]).toBeInstanceOf(ZipTask);
+});
+
+test('dependencies mapped from manifest', async () => {
+  const manifest = new Manifest({
+    steps: {
+      step1: {
+        type: 'copy',
+        parameters: { src: 'from', dest: 'to' },
+        depends: [ 'step2' ]
+      },
+      step2: {
+        type: 'copy',
+        parameters: { src: 'from', dest: 'to' },
+      }
+    }
+  });
+
+  const session = manifest.createSession();
+  expect(session.ready.map(x => x.id)).toEqual([ 'step2' ]); // only step2 is ready
+});
\ No newline at end of file
diff --git a/packages/@aws-cdk/cdk-build/test/session.test.ts b/packages/@aws-cdk/cdk-build/test/session.test.ts
new file mode 100644
index 0000000000000..5167d57585491
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/session.test.ts
@@ -0,0 +1,53 @@
+import { BuildSession } from '../lib/session';
+import { SimpleTask } from './util';
+
+test('empty session', async () => {
+  const session = new BuildSession();
+  await session.build();
+});
+
+test('session with a single task', async () => {
+  const session = new BuildSession();
+  const log = new Array<string>();
+  session.addTask(new SimpleTask('t1', log));
+  await session.build();
+
+  expect(log).toEqual([ 't1' ]);
+});
+
+test('session with a bunch of non-dependent tasks', async () => {
+  // GIVEN
+  const session = new BuildSession();
+  const log = new Array<string>();
+  const t1 = new SimpleTask('t1', log);
+  const t2 = new SimpleTask('t2', log);
+  const t3 = new SimpleTask('t3', log);
+  session.addTask(t1);
+  session.addTask(t3);
+  session.addTask(t2);
+
+  // WHEN
+  await session.build();
+
+  // THEN
+  expect(log).toEqual([ 't1', 't2', 't3' ]);
+});
+
+test('session with tasks that have deps', async () => {
+  // GIVEN
+  const session = new BuildSession();
+  const log = new Array<string>();
+  const t1 = new SimpleTask('t1', log);
+  const t2 = new SimpleTask('t2', log);
+  const t3 = new SimpleTask('t3', log);
+  session.addTask(t1);
+  session.addTask(t3);
+  session.addTask(t2);
+  t2.addDependency(t1);
+
+  // WHEN
+  await session.build();
+
+  // THEN
+  expect(log).toEqual([ 't1', 't3', 't2' ]);
+});
\ No newline at end of file
diff --git a/packages/@aws-cdk/cdk-build/test/task.test.ts b/packages/@aws-cdk/cdk-build/test/task.test.ts
new file mode 100644
index 0000000000000..34f7f89a53954
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/task.test.ts
@@ -0,0 +1,47 @@
+import { SimpleTask } from './util';
+
+test('simple task with no deps', async () => {
+  // GIVEN
+  const logs = new Array<string>();
+  const task = new SimpleTask('hello', logs);
+
+  // THEN
+  expect(task.ready).toBeTruthy();
+  expect(task.waiting).toEqual([]);
+
+  // WHEN
+  await task.build();
+
+  // THEN
+  expect(task.buildCalled).toBeTruthy();
+  expect(task.completed).toBeTruthy();
+  expect(logs).toEqual([ 'hello' ]);
+});
+
+test('task with a dependency is only ready with the dep is completed', async () => {
+  // GIVEN
+  const logs = new Array<string>();
+  const consumer = new SimpleTask('hello', logs);
+  const dep = new SimpleTask('dep', logs);
+  consumer.addDependency(dep);
+
+  // THEN
+  expect(dep.ready).toBeTruthy();
+  expect(consumer.ready).toBeFalsy();
+  expect(consumer.build()).rejects.toEqual(new Error(`Can't start build, waiting for the following tasks to complete: dep`));
+  expect(consumer.waiting).toEqual([ dep ]);
+
+  // WHEN
+  await dep.build();
+
+  // THEN
+  expect(dep.completed).toBeTruthy();
+  expect(consumer.ready).toBeTruthy();
+
+  // WHEN
+  await consumer.build();
+
+  // THEN
+  expect(consumer.completed).toBeTruthy();
+  expect(logs).toEqual([ 'dep', 'hello' ]);
+});
diff --git a/packages/@aws-cdk/cdk-build/test/tasks/__snapshots__/copy.test.js.snap b/packages/@aws-cdk/cdk-build/test/tasks/__snapshots__/copy.test.js.snap
new file mode 100644
index 0000000000000..c592d55173cb7
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/tasks/__snapshots__/copy.test.js.snap
@@ -0,0 +1,8 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`the "copy" can be used to copy files 1`] = `
+"This is a file which we will use for tests.
+"
+`;
+
+exports[`the "copy" task will no-op if the destination already exists 1`] = `"hello, I exist!"`;
diff --git a/packages/@aws-cdk/cdk-build/test/tasks/__snapshots__/zip.test.js.snap b/packages/@aws-cdk/cdk-build/test/tasks/__snapshots__/zip.test.js.snap
new file mode 100644
index 0000000000000..3044e37496904
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/tasks/__snapshots__/zip.test.js.snap
@@ -0,0 +1,10 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`the "zip" task can be used to zip a directory 1`] = `"../file1.txt"`;
+
+exports[`the "zip" task can be used to zip a directory 2`] = `
+"this is file #2
+"
+`;
+
+exports[`the "zip" task can be used to zip a directory 3`] = `"file3"`;
diff --git a/packages/@aws-cdk/cdk-build/test/tasks/copy.test.ts b/packages/@aws-cdk/cdk-build/test/tasks/copy.test.ts
new file mode 100644
index 0000000000000..010a224fcd3d5
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/tasks/copy.test.ts
@@ -0,0 +1,37 @@
+import fs = require('fs-extra');
+import os = require('os');
+import path = require('path');
+import CopyTask from '../../lib/tasks/copy';
+
+test('the "copy" can be used to copy files', async () => {
+  // GIVEN
+  const src = path.join(__dirname, '..', 'fixtures', 'file1.txt');
+  const dest = path.join(await tempdir(), 'output.txt');
+
+  // WHEN
+  const task = new CopyTask('copy', { src, dest });
+  const ret = await task.execute();
+
+  // THEN
+  expect(ret).toBeTruthy();
+  expect((await fs.readFile(dest)).toString()).toMatchSnapshot();
+});
+
+test('the "copy" task will no-op if the destination already exists', async () => {
+  // GIVEN
+  const src = path.join(__dirname, '..', 'fixtures', 'file1.txt');
+  const dest = path.join(await tempdir(), 'output.txt');
+  await fs.writeFile(dest, 'hello, I exist!');
+
+  // WHEN
+  const task = new CopyTask('copy', { src, dest });
+  const ret = await task.execute();
+
+  // THEN
+  expect(ret).toBeFalsy();
+  expect((await fs.readFile(dest)).toString()).toMatchSnapshot();
+});
+
+async function tempdir() {
+  return await fs.mkdtemp(path.join(os.tmpdir(), 'copy-test'));
+}
diff --git a/packages/@aws-cdk/cdk-build/test/tasks/docker.test.ts b/packages/@aws-cdk/cdk-build/test/tasks/docker.test.ts
new file mode 100644
index 0000000000000..44d5001f4a19c
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/tasks/docker.test.ts
@@ -0,0 +1,45 @@
+import DockerTask, { IDocker } from '../../lib/tasks/docker';
+
+test('the "docker" task can be used to build a docker image', async () => {
+  const docker = new DockerMock();
+  const task = new DockerTask('docker', {
+    dir: 'source-dir',
+    tag: 'my-tag',
+    docker
+  });
+
+  expect(await task.build()).toBeTruthy();
+  expect(docker.received).toEqual('build --tag my-tag source-dir');
+});
+
+test('if the tag already exists, the build will no-op', async () => {
+  const docker = new DockerMock();
+  docker.imageExists = true;
+  const task = new DockerTask('docker', {
+    dir: 'source-dir',
+    tag: 'my-tag',
+    docker
+  });
+
+  expect(await task.build()).toBeFalsy();
+  expect(docker.received).toEqual('images -q my-tag');
+});
+
+class DockerMock implements IDocker {
+  public imageExists = false;
+  public received?: string;
+
+  public async exec(command: string, ...args: string[]) {
+    this.received = `${command} ${args.join(' ')}`;
+
+    if (command === 'images') {
+      if (this.imageExists) {
+        return 'caf27325b298\n';
+      } else {
+        return '';
+      }
+    }
+
+    return 'ok';
+  }
+}
diff --git a/packages/@aws-cdk/cdk-build/test/tasks/zip.test.ts b/packages/@aws-cdk/cdk-build/test/tasks/zip.test.ts
new file mode 100644
index 0000000000000..3ee503a5abd6f
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/tasks/zip.test.ts
@@ -0,0 +1,49 @@
+import fs = require('fs-extra');
+import os = require('os');
+import path = require('path');
+import ZipTask from '../../lib/tasks/zip';
+import { decompress } from '../util';
+
+test('the "zip" task can be used to zip a directory', async () => {
+  // GIVEN
+  const src = path.join(__dirname, '..', 'fixtures', 'dir1');
+  const dest = path.join(await tempdir(), 'output.zip');
+
+  // WHEN
+  const task = new ZipTask('zip', { src, dest });
+  const ret = await task.execute();
+
+  // THEN
+  expect(await fs.readdir(path.dirname(dest))).toEqual([ 'output.zip' ]);
+  expect(ret).toBeTruthy();
+
+  const staging = await tempdir();
+  await decompress(dest, staging);
+
+  expect(await readTextFile(path.join(staging, 'file1.txt'))).toMatchSnapshot();
+  expect(await readTextFile(path.join(staging, 'file2.txt'))).toMatchSnapshot();
+  expect(await readTextFile(path.join(staging, 'subdir1', 'file3.txt'))).toMatchSnapshot();
+});
+
+test('the "zip" task will no-op if the destination already exists', async () => {
+  // GIVEN
+  const src = path.join(__dirname, '..', 'fixtures', 'dir1');
+  const dest = path.join(await tempdir(), 'output.zip');
+  await fs.writeFile(dest, 'i exist');
+
+  // WHEN
+  const task = new ZipTask('zip', { src, dest });
+  const ret = await task.execute();
+
+  // THEN
+  expect(ret).toBeFalsy();
+  expect(await readTextFile(dest)).toEqual('i exist');
+});
+
+async function tempdir() {
+  return await fs.mkdtemp(path.join(os.tmpdir(), 'copy-test'));
+}
+
+async function readTextFile(p: string): Promise<string> {
+  return (await fs.readFile(p)).toString();
+}
\ No newline at end of file
diff --git a/packages/@aws-cdk/cdk-build/test/util.ts b/packages/@aws-cdk/cdk-build/test/util.ts
new file mode 100644
index 0000000000000..277d810b3ce56
--- /dev/null
+++ b/packages/@aws-cdk/cdk-build/test/util.ts
@@ -0,0 +1,58 @@
+import fs = require('fs-extra');
+import os = require('os');
+import path = require('path');
+import unzip = require('unzip');
+import { Task } from '../lib';
+
+export async function createTree(files: { [path: string]: any }) {
+  const root = await fs.mkdtemp(os.tmpdir());
+
+  for (const [ filePath, content ] of Object.entries(files)) {
+    const absPath = path.join(root, filePath);
+    await fs.mkdirs(path.dirname(absPath));
+
+    if (typeof(content) === 'object') {
+      await fs.writeFile(absPath, JSON.stringify(content, undefined, 2));
+    } else {
+      await fs.writeFile(absPath, content);
+    }
+  }
+
+  return root;
+}
+
+export function snapshotTree(dir: string) {
+  const entries: { [name: string]: any } = { };
+  for (const file of fs.readdirSync(dir)) {
+    const fp = path.join(dir, file);
+    if (fs.statSync(fp).isDirectory()) {
+      entries[file] = snapshotTree(fp);
+    } else if (path.extname(file) === '.json') {
+      entries[file] = JSON.parse(fs.readFileSync(fp).toString());
+    } else {
+      entries[file] = fs.readFileSync(fp).toString().trim();
+    }
+  }
+  return entries;
+}
+
+export class SimpleTask extends Task {
+  public buildCalled = false;
+  constructor(id: string, private readonly log: string[]) {
+    super(id);
+  }
+  protected async execute() {
+    this.buildCalled = true;
+    this.log.push(this.id);
+    return true;
+  }
+}
+
+export async function decompress(zip: string, destDir: string) {
+  const writable = unzip.Extract({ path: destDir });
+  fs.createReadStream(zip).pipe(writable);
+  return new Promise((ok, ko) => {
+    writable.once('close', () => ok());
+    writable.once('error', err => ko(err));
+  });
+}
diff --git a/packages/@aws-cdk/cdk/lib/app.ts b/packages/@aws-cdk/cdk/lib/app.ts
index 46c8f6493489c..5188ce4ffa9f6 100644
--- a/packages/@aws-cdk/cdk/lib/app.ts
+++ b/packages/@aws-cdk/cdk/lib/app.ts
@@ -1,26 +1,34 @@
 import cxapi = require('@aws-cdk/cx-api');
+import fs = require('fs');
+import os = require('os');
 import { Root } from './construct';
-import { FileSystemStore, InMemoryStore, ISynthesisSession, Synthesizer } from './synthesis';
+import { FileSystemStore, ISynthesisSession, Synthesizer } from './synthesis';
 
-/**
- * Custom construction properties for a CDK program
- */
 export interface AppProps {
   /**
-   * Automatically call run before the application exits
+   * App-level context key/value pairs.
    *
-   * If you set this, you don't have to call `run()` anymore.
+   * If the environment variable `CDK_CONTEXT_JSON` is set, it is parsed as a JSON object
+   * and merged with this hash to form the application's context.
+   */
+  readonly context?: { [key: string]: string };
+
+  /**
+   * Output directory for the CDK application (takes precedence on `CDK_OUTDIR`)
    *
-   * @default true if running via CDK toolkit (CDK_OUTDIR is set), false otherwise
+   * @default if the environment variable `CDK_OUTDIR` is set, it will be used
+   * as the default value. Otherwise a temporary directory will be used.
    */
-  readonly autoRun?: boolean;
+  readonly outdir?: string;
 
   /**
-   * Additional context values for the application
+   * Automatically call run before the application exits
+   *
+   * If you set this, you don't have to call `run()` anymore.
    *
-   * @default No additional context
+   * @default true if running via CDK toolkit (CDK_OUTDIR is set), false otherwise
    */
-  readonly context?: { [key: string]: string };
+  readonly autoRun?: boolean;
 }
 
 /**
@@ -30,6 +38,7 @@ export class App extends Root {
   private _session?: ISynthesisSession;
   private readonly legacyManifest: boolean;
   private readonly runtimeInformation: boolean;
+  private readonly outdir: string;
 
   /**
    * Initializes a CDK application.
@@ -42,6 +51,7 @@ export class App extends Root {
     // both are reverse logic
     this.legacyManifest = this.node.getContext(cxapi.DISABLE_LEGACY_MANIFEST_CONTEXT) ? false : true;
     this.runtimeInformation = this.node.getContext(cxapi.DISABLE_VERSION_REPORTING) ? false : true;
+    this.outdir = props.outdir || process.env[cxapi.OUTDIR_ENV] || fs.mkdtempSync(os.tmpdir());
 
     const autoRun = props.autoRun !== undefined ? props.autoRun : cxapi.OUTDIR_ENV in process.env;
 
@@ -61,13 +71,7 @@ export class App extends Root {
       return this._session;
     }
 
-    const outdir = process.env[cxapi.OUTDIR_ENV];
-    let store;
-    if (outdir) {
-      store = new FileSystemStore({ outdir });
-    } else {
-      store = new InMemoryStore();
-    }
+    const store = new FileSystemStore({ path: this.outdir });
 
     const synth = new Synthesizer();
 
@@ -80,39 +84,6 @@ export class App extends Root {
     return this._session;
   }
 
-  /**
-   * Synthesize and validate a single stack.
-   * @param stackName The name of the stack to synthesize
-   * @deprecated This method is going to be deprecated in a future version of the CDK
-   */
-  public synthesizeStack(stackName: string): cxapi.SynthesizedStack {
-    if (!this.legacyManifest) {
-      throw new Error('No legacy manifest available, return an old-style stack output');
-    }
-
-    const session = this.run();
-    const legacy: cxapi.SynthesizeResponse = session.store.readJson(cxapi.OUTFILE_NAME);
-
-    const res = legacy.stacks.find(s => s.name === stackName);
-    if (!res) {
-      throw new Error(`Stack "${stackName}" not found`);
-    }
-
-    return res;
-  }
-
-  /**
-   * Synthesizes multiple stacks
-   * @deprecated This method is going to be deprecated in a future version of the CDK
-   */
-  public synthesizeStacks(stackNames: string[]): cxapi.SynthesizedStack[] {
-    const ret: cxapi.SynthesizedStack[] = [];
-    for (const stackName of stackNames) {
-      ret.push(this.synthesizeStack(stackName));
-    }
-    return ret;
-  }
-
   private loadContext(defaults: { [key: string]: string } = { }) {
     // prime with defaults passed through constructor
     for (const [ k, v ] of Object.entries(defaults)) {
diff --git a/packages/@aws-cdk/cdk/lib/cfn-element.ts b/packages/@aws-cdk/cdk/lib/cfn-element.ts
index 2d08e69a619ea..87c0b46cff517 100644
--- a/packages/@aws-cdk/cdk/lib/cfn-element.ts
+++ b/packages/@aws-cdk/cdk/lib/cfn-element.ts
@@ -1,3 +1,4 @@
+// import cxapi = require('@aws-cdk/cx-api');
 import { Construct, IConstruct, PATH_SEP } from "./construct";
 import { Token } from './token';
 
@@ -43,6 +44,9 @@ export abstract class CfnElement extends Construct {
   constructor(scope: Construct, id: string) {
     super(scope, id);
 
+    // TODO: re-visit this condition - filtering it breaks our expect library (see inspector).
+    // if (this.node.getContext(cxapi.PATH_METADATA_ENABLE_CONTEXT)) {
+    // }
     this.node.addMetadata(LOGICAL_ID_MD, new (require("./token").Token)(() => this.logicalId), this.constructor);
 
     this._logicalId = this.node.stack.logicalIds.getLogicalId(this);
diff --git a/packages/@aws-cdk/cdk/lib/construct.ts b/packages/@aws-cdk/cdk/lib/construct.ts
index 080c97fd7b602..b38f12bb9c18c 100644
--- a/packages/@aws-cdk/cdk/lib/construct.ts
+++ b/packages/@aws-cdk/cdk/lib/construct.ts
@@ -280,7 +280,8 @@ export class ConstructNode {
     if (data == null) {
       return;
     }
-    const trace = createStackTrace(from || this.addMetadata);
+
+    const trace = this.getContext(cxapi.DISABLE_STACK_TRACE) ? [ ] : createStackTrace(from || this.addMetadata);
     this._metadata.push({ type, data, trace });
   }
 
@@ -369,6 +370,17 @@ export class ConstructNode {
     return ret;
   }
 
+  /**
+   * @returns the root construct.
+   */
+  public get root(): Construct {
+    if (!this.scope) {
+      return this.host;
+    }
+
+    return this.scope.node.root;
+  }
+
   /**
    * Throws if the `props` bag doesn't include the property `name`.
    * In the future we can add some type-checking here, maybe even auto-generate during compilation.
diff --git a/packages/@aws-cdk/cdk/lib/stack.ts b/packages/@aws-cdk/cdk/lib/stack.ts
index ed1023ffaee36..59525067b37a3 100644
--- a/packages/@aws-cdk/cdk/lib/stack.ts
+++ b/packages/@aws-cdk/cdk/lib/stack.ts
@@ -494,7 +494,7 @@ export class Stack extends Construct {
     const template = `${this.name}.template.json`;
 
     // write the CloudFormation template as a JSON file
-    session.store.writeJson(template, this._toCloudFormation());
+    session.assembly.writeJson(template, this._toCloudFormation());
 
     const deps = this.dependencies().map(s => s.name);
     const meta = this.collectMetadata();
diff --git a/packages/@aws-cdk/cdk/lib/synthesis.ts b/packages/@aws-cdk/cdk/lib/synthesis.ts
index 47d2cfdbd581e..700cfc884265e 100644
--- a/packages/@aws-cdk/cdk/lib/synthesis.ts
+++ b/packages/@aws-cdk/cdk/lib/synthesis.ts
@@ -1,6 +1,5 @@
 import cxapi = require('@aws-cdk/cx-api');
 import fs = require('fs');
-import os = require('os');
 import path = require('path');
 import { ConstructOrder, IConstruct } from './construct';
 import { collectRuntimeInformation } from './runtime-info';
@@ -12,7 +11,10 @@ export interface ISynthesizable {
 
 export interface ISynthesisSession {
   readonly store: ISessionStore;
+  readonly assembly: ISessionStore;
+  readonly staging: ISessionStore;
   readonly manifest: cxapi.AssemblyManifest;
+  readonly path: string;
   addArtifact(id: string, droplet: cxapi.Artifact): void;
   addBuildStep(id: string, step: cxapi.BuildStep): void;
   tryGetArtifact(id: string): cxapi.Artifact | undefined;
@@ -22,9 +24,8 @@ export interface ISynthesisSession {
 export interface SynthesisOptions extends ManifestOptions {
   /**
    * The file store used for this session.
-   * @default InMemoryStore
    */
-  readonly store?: ISessionStore;
+  readonly store: ISessionStore;
 
   /**
    * Whether synthesis should skip the validation phase.
@@ -34,7 +35,7 @@ export interface SynthesisOptions extends ManifestOptions {
 }
 
 export class Synthesizer {
-  public synthesize(root: IConstruct, options: SynthesisOptions = { }): ISynthesisSession {
+  public synthesize(root: IConstruct, options: SynthesisOptions): ISynthesisSession {
     const session = new SynthesisSession(options);
 
     // the three holy phases of synthesis: prepare, validate and synthesize
@@ -75,13 +76,21 @@ export class SynthesisSession implements ISynthesisSession {
   }
 
   public readonly store: ISessionStore;
+  public readonly assembly: ISessionStore;
+  public readonly staging: ISessionStore;
+  public readonly path: string;
 
   private readonly artifacts: { [id: string]: cxapi.Artifact } = { };
   private readonly buildSteps: { [id: string]: cxapi.BuildStep } = { };
   private _manifest?: cxapi.AssemblyManifest;
+  // private readonly runtimeInfo: boolean;
 
   constructor(options: SynthesisOptions) {
-    this.store = options.store || new InMemoryStore();
+    this.store = options.store;
+    // this.runtimeInfo = options.runtimeInformation !== undefined ? options.runtimeInformation : true;
+    this.assembly = this.store.substore('assembly');
+    this.staging = this.store.substore('staging');
+    this.path = this.store.path;
   }
 
   public get manifest() {
@@ -117,7 +126,6 @@ export class SynthesisSession implements ISynthesisSession {
   }
 
   public close(options: ManifestOptions = { }): cxapi.AssemblyManifest {
-    const legacyManifest = options.legacyManifest !== undefined ? options.legacyManifest : false;
     const runtimeInfo = options.runtimeInformation !== undefined ? options.runtimeInformation : true;
 
     const manifest: cxapi.AssemblyManifest = this._manifest = filterUndefined({
@@ -126,7 +134,7 @@ export class SynthesisSession implements ISynthesisSession {
       runtime: runtimeInfo ? collectRuntimeInformation() : undefined
     });
 
-    this.store.writeFile(cxapi.MANIFEST_FILE, JSON.stringify(manifest, undefined, 2));
+    this.assembly.writeFile(cxapi.MANIFEST_FILE, JSON.stringify(manifest, undefined, 2));
 
     // write build manifest if we have build steps
     if (Object.keys(this.buildSteps).length > 0) {
@@ -134,21 +142,11 @@ export class SynthesisSession implements ISynthesisSession {
         steps: this.buildSteps
       };
 
+      // how to build cdk.out, referencing files in staging/ and outputting to assembly/
       this.store.writeFile(cxapi.BUILD_FILE, JSON.stringify(buildManifest, undefined, 2));
     }
 
-    if (legacyManifest) {
-      const legacy: cxapi.SynthesizeResponse = {
-        ...manifest,
-        stacks: renderLegacyStacks(manifest, this.store)
-      };
-
-      // render the legacy manifest (cdk.out) which also contains a "stacks" attribute with all the rendered stacks.
-      this.store.writeFile(cxapi.OUTFILE_NAME, JSON.stringify(legacy, undefined, 2));
-    }
-
     this.store.lock();
-
     return manifest;
   }
 }
@@ -168,6 +166,21 @@ export interface ManifestOptions {
 }
 
 export interface ISessionStore {
+  /**
+   * The local directory where the store resides.
+   */
+  readonly path: string;
+
+  /**
+   * Creates a subdirectory named `directoryName` and returns a session store that
+   * can be used to write/read files from that store.
+   *
+   * If there is already a substore by that name, this method will throw.
+   *
+   * @param directoryName The name of the directory
+   */
+  substore(directoryName: string): ISessionStore;
+
   /**
    * Creates a directory and returns it's full path.
    * @param directoryName The name of the directory to create.
@@ -229,21 +242,36 @@ export interface FileSystemStoreOptions {
   /**
    * The output directory for synthesis artifacts
    */
-  readonly outdir: string;
+  readonly path: string;
+
+  /**
+   * The parent store (optional)
+   */
+  readonly parent?: FileSystemStore;
 }
 
 /**
  * Can be used to prepare and emit synthesis artifacts into an output directory.
  */
 export class FileSystemStore implements ISessionStore {
-  private readonly outdir: string;
+  public readonly path: string;
+  // private readonly parent?: FileSystemStore;
   private locked = false;
 
   constructor(options: FileSystemStoreOptions) {
-    this.outdir = options.outdir;
+    this.path = options.path;
+    // this.parent = options.parent;
     return;
   }
 
+  public substore(directoryName: string): ISessionStore {
+    const p = this.mkdir(directoryName);
+    return new FileSystemStore({
+      path: p,
+      parent: this
+    });
+  }
+
   public writeFile(fileName: string, data: any) {
     this.canWrite(fileName);
 
@@ -290,7 +318,7 @@ export class FileSystemStore implements ISessionStore {
   }
 
   public list(): string[] {
-    return fs.readdirSync(this.outdir).sort();
+    return fs.readdirSync(this.path).sort();
   }
 
   public lock() {
@@ -298,7 +326,7 @@ export class FileSystemStore implements ISessionStore {
   }
 
   private pathForArtifact(id: string) {
-    return path.join(this.outdir, id);
+    return path.join(this.path, id);
   }
 
   private canWrite(artifactName: string) {
@@ -310,101 +338,3 @@ export class FileSystemStore implements ISessionStore {
     }
   }
 }
-
-export class InMemoryStore implements ISessionStore {
-  private files: { [fileName: string]: any } = { };
-  private dirs: { [dirName: string]: string } = { }; // value is path to a temporary directory
-
-  private locked = false;
-
-  public writeFile(fileName: string, data: any): void {
-    this.canWrite(fileName);
-    this.files[fileName] = data;
-  }
-
-  public writeJson(fileName: string, json: any): void {
-    this.writeFile(fileName, JSON.stringify(json, undefined, 2));
-  }
-
-  public readFile(fileName: string) {
-    if (!(fileName in this.files)) {
-      throw new Error(`${fileName} not found`);
-    }
-    return this.files[fileName];
-  }
-
-  public readJson(fileName: string): any {
-    return JSON.parse(this.readFile(fileName).toString());
-  }
-
-  public exists(name: string) {
-    return name in this.files || name in this.dirs;
-  }
-
-  public mkdir(directoryName: string): string {
-    this.canWrite(directoryName);
-
-    const p = fs.mkdtempSync(path.join(os.tmpdir(), directoryName));
-    this.dirs[directoryName] = p;
-    return p;
-  }
-
-  public readdir(directoryName: string): string[] {
-    if (!this.exists(directoryName)) {
-      throw new Error(`${directoryName} not found`);
-    }
-
-    const p = this.dirs[directoryName];
-    return fs.readdirSync(p);
-  }
-
-  public list(): string[] {
-    return [ ...Object.keys(this.files), ...Object.keys(this.dirs) ].sort();
-  }
-
-  public lock() {
-    this.locked = true;
-  }
-
-  private canWrite(artifactName: string) {
-    if (this.exists(artifactName)) {
-      throw new Error(`An artifact named ${artifactName} was already written to this session`);
-    }
-    if (this.locked) {
-      throw new Error('Session has already been finalized');
-    }
-  }
-}
-
-export function renderLegacyStacks(manifest: cxapi.AssemblyManifest, store: ISessionStore) {
-  // special case for backwards compat. build a list of stacks for the manifest
-  const stacks = new Array<cxapi.SynthesizedStack>();
-  const artifacts = manifest.artifacts || { };
-
-  for (const [ id, artifact ] of Object.entries(artifacts)) {
-    if (artifact.type === cxapi.ArtifactType.AwsCloudFormationStack) {
-      const templateFile = artifact.properties && artifact.properties.templateFile;
-      if (!templateFile) {
-        throw new Error(`Invalid cloudformation artifact. Missing "template" property`);
-      }
-      const template = store.readJson(templateFile);
-
-      const match = cxapi.AWS_ENV_REGEX.exec(artifact.environment);
-      if (!match) {
-        throw new Error(`"environment" must match regex: ${cxapi.AWS_ENV_REGEX}`);
-      }
-
-      stacks.push(filterUndefined({
-        name: id,
-        environment: { name: artifact.environment.substr('aws://'.length), account: match[1], region: match[2] },
-        template,
-        metadata: artifact.metadata || {},
-        autoDeploy: artifact.autoDeploy,
-        dependsOn: artifact.dependencies && artifact.dependencies.length > 0 ? artifact.dependencies : undefined,
-        missing: artifact.missing
-      }));
-    }
-  }
-
-  return stacks;
-}
diff --git a/packages/@aws-cdk/cdk/test/test.app.ts b/packages/@aws-cdk/cdk/test/test.app.ts
index 04c8995d0932b..3424baa09d12e 100644
--- a/packages/@aws-cdk/cdk/test/test.app.ts
+++ b/packages/@aws-cdk/cdk/test/test.app.ts
@@ -1,20 +1,17 @@
 import cxapi = require('@aws-cdk/cx-api');
 import { Test } from 'nodeunit';
-import { CfnResource, Construct, Stack, StackProps } from '../lib';
+import { CfnResource, Construct, ISynthesisSession, Stack, StackProps } from '../lib';
 import { App } from '../lib/app';
 
-function withApp(context: { [key: string]: any } | undefined, block: (app: App) => void): cxapi.SynthesizeResponse {
+function withApp(context: { [key: string]: any } | undefined, block: (app: App) => void): ISynthesisSession {
   const app = new App({ context });
 
   block(app);
 
-  const session = app.run();
-
-  // return the legacy manifest
-  return session.store.readJson(cxapi.OUTFILE_NAME);
+  return app.run();
 }
 
-function synth(context?: { [key: string]: any }): cxapi.SynthesizeResponse {
+function synth(context?: { [key: string]: any }): ISynthesisSession {
   return withApp(context, app => {
     const stack1 = new Stack(app, 'stack1', { env: { account: '12345', region: 'us-east-1' } });
     new CfnResource(stack1, 's1c1', { type: 'DummyResource', properties: { Prop1: 'Prop1' } });
@@ -33,51 +30,65 @@ function synth(context?: { [key: string]: any }): cxapi.SynthesizeResponse {
   });
 }
 
-function synthStack(name: string, includeMetadata: boolean = false, context?: any): cxapi.SynthesizedStack {
-  const response = synth(context);
-  const stack = response.stacks.find(s => s.name === name);
-  if (!stack) {
+function synthStack(name: string, includeMetadata: boolean = false, context?: any): [ISynthesisSession, cxapi.Artifact] {
+  const session = synth(context);
+  const entry = Object
+    .entries(session.manifest.artifacts || {})
+    .filter(e => e[1].type === cxapi.ArtifactType.AwsCloudFormationStack)
+    .find(e => e[0] === name);
+
+  if (!entry) {
     throw new Error(`Stack ${name} not found`);
   }
+  const stack = entry[1] as cxapi.Artifact;
 
   if (!includeMetadata) {
     delete (stack as any).metadata;
   }
 
-  return stack;
+  return [session, stack];
 }
 
 export = {
   'synthesizes all stacks and returns synthesis result'(test: Test) {
-    const response = synth();
+    const session = synth();
 
     // clean up metadata so assertion will be sane
-    response.stacks.forEach(s => delete (s as any).metadata);
-    delete (response as any).runtime;
-    delete (response as any).artifacts;
+    Object.values(session.manifest.artifacts!).forEach(a => delete (a as any).metadata);
+    delete (session.manifest as any).runtime;
 
-    test.deepEqual(response, {
+    test.deepEqual(session.manifest, {
       version: '0.19.0',
-      stacks:
-      [ { name: 'stack1',
-          environment:
-           { name: '12345/us-east-1',
-             account: '12345',
-             region: 'us-east-1' },
-          template:
-           { Resources:
-              { s1c1: { Type: 'DummyResource', Properties: { Prop1: 'Prop1' } },
-                s1c2: { Type: 'DummyResource', Properties: { Foo: 123 } } } } },
-        { name: 'stack2',
-          environment:
-           { name: 'unknown-account/unknown-region',
-             account: 'unknown-account',
-             region: 'unknown-region' },
-          template:
-           { Resources:
-              { s2c1: { Type: 'DummyResource', Properties: { Prog2: 'Prog2' } },
-                s1c2r1D1791C01: { Type: 'ResourceType1' },
-                s1c2r25F685FFF: { Type: 'ResourceType2' } } } } ] });
+      artifacts: {
+        stack1: {
+          type: cxapi.ArtifactType.AwsCloudFormationStack,
+          environment: 'aws://12345/us-east-1',
+          properties: {
+            templateFile: 'stack1.template.json'
+          }
+        },
+        stack2: {
+          type: cxapi.ArtifactType.AwsCloudFormationStack,
+          environment: 'aws://unknown-account/unknown-region',
+          properties: {
+            templateFile: 'stack2.template.json'
+          }
+        }
+      }
+    });
+    test.deepEqual(session.assembly.readJson('stack1.template.json'), {
+      Resources: {
+        s1c1: { Type: 'DummyResource', Properties: { Prop1: 'Prop1' } },
+        s1c2: { Type: 'DummyResource', Properties: { Foo: 123 } }
+      }
+    });
+    test.deepEqual(session.assembly.readJson('stack2.template.json'), {
+      Resources: {
+        s2c1: { Type: 'DummyResource', Properties: { Prog2: 'Prog2' } },
+        s1c2r1D1791C01: { Type: 'ResourceType1' },
+        s1c2r25F685FFF: { Type: 'ResourceType2' }
+      }
+    });
     test.done();
   },
 
@@ -86,17 +97,21 @@ export = {
     const stack = new Stack(prog, 'MyStack');
     new CfnResource(stack, 'MyResource', { type: 'MyResourceType' });
 
-    test.throws(() => prog.synthesizeStacks(['foo']), /foo/);
+    const session = prog.run();
+    const templateFile = session.getArtifact('MyStack').properties!.templateFile;
+    const template = session.assembly.readJson(templateFile);
 
-    test.deepEqual(prog.synthesizeStack('MyStack').template,
-      { Resources: { MyResource: { Type: 'MyResourceType' } } });
+    test.deepEqual(template, {
+      Resources: {
+        MyResource: { Type: 'MyResourceType' }
+      }
+    });
     test.done();
   },
 
   'synth(name) also collects metadata from all constructs in the stack'(test: Test) {
-    const stack = synthStack('stack1', true);
-
-    const output = stack.metadata;
+    const [, stack] = synthStack('stack1', true);
+    const output = stack.metadata || {};
     stripStackTraces(output);
 
     test.ok(output['/'], 'app-level metadata is included under "."');
@@ -112,8 +127,8 @@ export = {
     test.equal(output['/stack1/s1c2'].length, 2, 'two entries');
     test.equal(output['/stack1/s1c2'][0].data, 'warning1');
 
-    const stack2 = synthStack('stack2', true);
-    const output2 = stack2.metadata;
+    const [, stack2] = synthStack('stack2', true);
+    const output2 = stack2.metadata || {};
 
     test.ok(output2['/stack2/s1c2']);
     test.equal(output2['/stack2/s1c2'][0].type, 'meta');
@@ -134,24 +149,24 @@ export = {
   },
 
   'context from the command line can be used when creating the stack'(test: Test) {
-    const output = synthStack('stack2', false, { ctx1: 'HELLO' });
+    const [session, ] = synthStack('stack2', false, { ctx1: 'HELLO' });
 
-    test.deepEqual(output.template, {
+    test.deepEqual(session.assembly.readJson('stack2.template.json'), {
       Resources: {
         s2c1: {
-        Type: "DummyResource",
-        Properties: {
-          Prog2: "Prog2"
-        }
+          Type: "DummyResource",
+          Properties: {
+            Prog2: "Prog2"
+          }
         },
         s1c2r1D1791C01: {
-        Type: "ResourceType1"
+          Type: "ResourceType1"
         },
         s1c2r25F685FFF: {
-        Type: "ResourceType2",
-        Properties: {
-          FromContext: "HELLO"
-        }
+          Type: "ResourceType2",
+          Properties: {
+            FromContext: "HELLO"
+          }
         }
       }
     });
@@ -190,10 +205,7 @@ export = {
     new Child(parent, 'C1');
     new Child(parent, 'C2');
 
-    test.throws(() => {
-      app.synthesizeStacks(['Parent']);
-    }, /Validation failed with the following errors/);
-
+    test.throws(() => app.run(), /Validation failed with the following errors/);
     test.done();
   },
 
@@ -223,11 +235,11 @@ export = {
       }
     }
 
-    const response = withApp(undefined, app => {
+    const session = withApp(undefined, app => {
       new MyStack(app, 'MyStack');
     });
 
-    test.deepEqual(response.stacks[0].missing, {
+    test.deepEqual((session.manifest.artifacts!.MyStack as any).missing, {
       "missing-context-key": {
         provider: 'fake',
         props: {
@@ -252,22 +264,22 @@ export = {
     const context: any = {};
     context[cxapi.DISABLE_VERSION_REPORTING] = true;
 
-    const response = withApp(context, app => {
+    const session = withApp(context, app => {
       const stack = new Stack(app, 'stack1');
       new CfnResource(stack, 'MyResource', { type: 'Resource::Type' });
     });
 
-    test.equals(response.runtime, undefined);
+    test.equals(session.manifest.runtime, undefined);
     test.done();
   },
 
   'runtime library versions'(test: Test) {
-    const response = withApp({}, app => {
+    const session = withApp({}, app => {
       const stack = new Stack(app, 'stack1');
       new CfnResource(stack, 'MyResource', { type: 'Resource::Type' });
     });
 
-    const libs = (response.runtime && response.runtime.libraries) || { };
+    const libs = (session.manifest.runtime && session.manifest.runtime.libraries) || { };
 
     const version = require('../package.json').version;
     test.deepEqual(libs['@aws-cdk/cdk'], version);
@@ -279,12 +291,12 @@ export = {
   'jsii-runtime version loaded from JSII_AGENT'(test: Test) {
     process.env.JSII_AGENT = 'Java/1.2.3.4';
 
-    const response = withApp({}, app => {
+    const session = withApp({}, app => {
       const stack = new Stack(app, 'stack1');
       new CfnResource(stack, 'MyResource', { type: 'Resource::Type' });
     });
 
-    const libs = (response.runtime && response.runtime.libraries) || { };
+    const libs = (session.manifest.runtime && session.manifest.runtime.libraries) || { };
     test.deepEqual(libs['jsii-runtime'], `Java/1.2.3.4`);
 
     delete process.env.JSII_AGENT;
@@ -292,12 +304,12 @@ export = {
   },
 
   'version reporting includes only @aws-cdk, aws-cdk and jsii libraries'(test: Test) {
-    const response = withApp({}, app => {
+    const session = withApp({}, app => {
       const stack = new Stack(app, 'stack1');
       new CfnResource(stack, 'MyResource', { type: 'Resource::Type' });
     });
 
-    const libs = (response.runtime && response.runtime.libraries) || { };
+    const libs = (session.manifest.runtime && session.manifest.runtime.libraries) || { };
 
     const version = require('../package.json').version;
     test.deepEqual(libs, {
@@ -311,7 +323,7 @@ export = {
 
   'deep stack is shown and synthesized properly'(test: Test) {
     // WHEN
-    const response = withApp(undefined, (app) => {
+    const session = withApp(undefined, (app) => {
       const topStack = new Stack(app, 'Stack');
       const topResource = new CfnResource(topStack, 'Res', { type: 'CDK::TopStack::Resource' });
 
@@ -320,16 +332,11 @@ export = {
     });
 
     // THEN
-    test.deepEqual(response.stacks.map(s => ({ name: s.name, template: s.template })), [
-      {
-        name: 'StackResStack7E4AFA86',
-        template: { Resources: { Res: { Type: 'CDK::BottomStack::Resource' } } },
-      },
-      {
-        name: 'Stack',
-        template: { Resources: { Res: { Type: 'CDK::TopStack::Resource' } } },
-      }
-    ]);
+    test.deepEqual(session.manifest.artifacts!.StackResStack7E4AFA86, {
+      type: cxapi.ArtifactType.AwsCloudFormationStack,
+      environment: 'aws://unknown-account/unknown-region',
+      properties: { templateFile: 'StackResStack7E4AFA86.template.json' }
+    });
 
     test.done();
   },
diff --git a/packages/@aws-cdk/cdk/test/test.context.ts b/packages/@aws-cdk/cdk/test/test.context.ts
index 20ccfd16a6ea5..06f501e04a272 100644
--- a/packages/@aws-cdk/cdk/test/test.context.ts
+++ b/packages/@aws-cdk/cdk/test/test.context.ts
@@ -101,10 +101,15 @@ export = {
     test.deepEqual(new AvailabilityZoneProvider(stack).availabilityZones, [ 'dummy1a', 'dummy1b', 'dummy1c' ]);
     test.deepEqual(new SSMParameterProvider(child, {parameterName: 'foo'}).parameterValue(), 'dummy');
 
-    const output = app.synthesizeStack(stack.name);
+    const session = app.run();
+    const output = session.getArtifact('test-stack');
 
-    const azError: MetadataEntry | undefined = output.metadata['/test-stack'].find(x => x.type === cxapi.ERROR_METADATA_KEY);
-    const ssmError: MetadataEntry | undefined = output.metadata['/test-stack/ChildConstruct'].find(x => x.type === cxapi.ERROR_METADATA_KEY);
+    if (!output.metadata) {
+      throw new Error('no metadata');
+    }
+
+    const azError: MetadataEntry | undefined = output.metadata['/test-stack'].find((x: any) => x.type === cxapi.ERROR_METADATA_KEY);
+    const ssmError: MetadataEntry | undefined = output.metadata['/test-stack/ChildConstruct'].find((x: any) => x.type === cxapi.ERROR_METADATA_KEY);
 
     test.ok(azError && (azError.data as string).includes('Cannot determine scope for context provider availability-zones'));
     test.ok(ssmError && (ssmError.data as string).includes('Cannot determine scope for context provider ssm'));
diff --git a/packages/@aws-cdk/cdk/test/test.synthesis.ts b/packages/@aws-cdk/cdk/test/test.synthesis.ts
index c360054a24546..dd15d87efcdf5 100644
--- a/packages/@aws-cdk/cdk/test/test.synthesis.ts
+++ b/packages/@aws-cdk/cdk/test/test.synthesis.ts
@@ -4,7 +4,7 @@ import { Test } from 'nodeunit';
 import os = require('os');
 import path = require('path');
 import cdk = require('../lib');
-import { Construct, FileSystemStore, InMemoryStore, ISynthesisSession, SynthesisSession, Synthesizer } from '../lib';
+import { FileSystemStore, SynthesisSession } from '../lib';
 
 const storeTestMatrix: any = {};
 
@@ -27,8 +27,8 @@ export = {
 
     // THEN
     test.same(app.run(), session); // same session if we run() again
-    test.deepEqual(session.store.list(), [ 'manifest.json' ]);
-    test.deepEqual(session.store.readJson('manifest.json').artifacts, {});
+    test.deepEqual(session.assembly.list(), [ 'manifest.json' ]);
+    test.deepEqual(session.assembly.readJson('manifest.json').artifacts, {});
     test.done();
   },
 
@@ -41,7 +41,7 @@ export = {
     const session = app.run();
 
     // THEN
-    test.deepEqual(session.store.list(), [
+    test.deepEqual(session.assembly.list(), [
       'manifest.json',
       'one-stack.template.json'
     ]);
@@ -55,7 +55,7 @@ export = {
 
     class MyConstruct extends cdk.Construct implements cdk.ISynthesizable {
       public synthesize(s: cdk.ISynthesisSession) {
-        s.store.writeJson('foo.json', { bar: 123 });
+        s.assembly.writeJson('foo.json', { bar: 123 });
         s.addArtifact('my-random-construct', {
           type: cxapi.ArtifactType.AwsCloudFormationStack,
           environment: 'aws://12345/bar',
@@ -72,12 +72,12 @@ export = {
     const session = app.run();
 
     // THEN
-    test.deepEqual(session.store.list(), [
+    test.deepEqual(session.assembly.list(), [
       'foo.json',
       'manifest.json',
       'one-stack.template.json'
     ]);
-    test.deepEqual(session.store.readJson('foo.json'), { bar: 123 });
+    test.deepEqual(session.assembly.readJson('foo.json'), { bar: 123 });
     test.deepEqual(session.manifest, {
       version: '0.19.0',
       artifacts: {
@@ -96,80 +96,6 @@ export = {
     test.done();
   },
 
-  'backwards compatibility: cdk.out contains all synthesized stacks'(test: Test) {
-    // GIVEN
-    const app = new cdk.App();
-    const stack1 = new cdk.Stack(app, 'stack1');
-    new cdk.CfnResource(stack1, 'Resource1', { type: 'AWS::CDK::Resource' });
-    new cdk.CfnResource(stack1, 'Resource2', { type: 'AWS::CDK::Resource' });
-    const stack2 = new cdk.Stack(app, 'stack2');
-    new cdk.CfnResource(stack2, 'ResourceA', { type: 'AWS::CDK::Resource' });
-
-    // WHEN
-    const session = app.run();
-    const legacy: cxapi.SynthesizeResponse = session.store.readJson(cxapi.OUTFILE_NAME);
-
-    // THEN
-    const t1 = legacy.stacks.find(s => s.name === 'stack1')!.template;
-    const t2 = legacy.stacks.find(s => s.name === 'stack2')!.template;
-
-    test.deepEqual(t1, {
-      Resources: {
-        Resource1: { Type: 'AWS::CDK::Resource' },
-        Resource2: { Type: 'AWS::CDK::Resource' }
-      }
-    });
-    test.deepEqual(t2, {
-      Resources: {
-        ResourceA: { Type: 'AWS::CDK::Resource' }
-      }
-    });
-    test.done();
-  },
-
-  'it should be possible to synthesize without an app'(test: Test) {
-    const calls = new Array<string>();
-
-    class SynthesizeMe extends Construct {
-      constructor() {
-        super(undefined as any, 'id');
-      }
-
-      protected validate(): string[] {
-        calls.push('validate');
-        return [];
-      }
-
-      protected prepare(): void {
-        calls.push('prepare');
-      }
-
-      protected synthesize(session: ISynthesisSession) {
-        calls.push('synthesize');
-
-        session.addArtifact('art', {
-          type: cxapi.ArtifactType.AwsEcrDockerImage,
-          environment: 'aws://unknown-account/us-east-1'
-        });
-
-        session.store.writeJson('hey.json', { hello: 123 });
-      }
-    }
-
-    const root = new SynthesizeMe();
-
-    const synth = new Synthesizer();
-    const result = synth.synthesize(root);
-
-    test.deepEqual(calls, [ 'prepare', 'validate', 'synthesize' ]);
-    test.deepEqual(result.store.readJson('hey.json'), { hello: 123 });
-    test.deepEqual(result.manifest.artifacts!.art, {
-      type: 'aws:ecr:image',
-      environment: 'aws://unknown-account/us-east-1'
-    });
-    test.done();
-  },
-
   'store': storeTestMatrix
 };
 
@@ -270,7 +196,7 @@ const storeTests = {
       }
     });
 
-    session.store.writeJson(templateFile, {
+    session.assembly.writeJson(templateFile, {
       Resources: {
         MyTopic: {
           Type: 'AWS::S3::Topic'
@@ -280,7 +206,7 @@ const storeTests = {
 
     session.close();
 
-    const manifest = session.store.readJson(cxapi.MANIFEST_FILE);
+    const manifest = session.assembly.readJson(cxapi.MANIFEST_FILE);
 
     // THEN
     delete manifest.runtime; // deterministic tests
@@ -314,7 +240,7 @@ const storeTests = {
     });
 
     // verify we have a template file
-    test.deepEqual(session.store.readJson(templateFile), {
+    test.deepEqual(session.assembly.readJson(templateFile), {
       Resources: {
         MyTopic: {
           Type: 'AWS::S3::Topic'
@@ -343,7 +269,7 @@ const storeTests = {
     test.done();
   },
 
-  'addBuildStep can be used to produce build.json'(test: Test) {
+  'addBuildStep can be used to produce build.json in root of cdk.out'(test: Test) {
     // GIVEN
     const app = createModernApp();
 
@@ -363,7 +289,6 @@ const storeTests = {
 
     // THEN
     const session  = app.run();
-    test.deepEqual(session.store.list(), [ 'build.json', 'manifest.json' ]);
     test.deepEqual(session.store.readJson('build.json'), {
       steps: {
         step_id: { type: 'build-step-type', parameters: { boom: 123 } }
@@ -375,8 +300,6 @@ const storeTests = {
 
 for (const [name, fn] of Object.entries(storeTests)) {
   const outdir = fs.mkdtempSync(path.join(os.tmpdir(), 'synthesis-tests'));
-  const fsStore = new FileSystemStore({ outdir });
-  const memoryStore = new InMemoryStore();
+  const fsStore = new FileSystemStore({ path: outdir });
   storeTestMatrix[`FileSystemStore - ${name}`] = (test: Test) => fn(test, fsStore);
-  storeTestMatrix[`InMemoryStore - ${name}`] = (test: Test) => fn(test, memoryStore);
 }
diff --git a/packages/@aws-cdk/cx-api/lib/cxapi.ts b/packages/@aws-cdk/cx-api/lib/cxapi.ts
index ae76ea0ea1eac..4833dca1d027f 100644
--- a/packages/@aws-cdk/cx-api/lib/cxapi.ts
+++ b/packages/@aws-cdk/cx-api/lib/cxapi.ts
@@ -3,7 +3,6 @@
  */
 
 import { Artifact } from './artifacts';
-import { Environment } from './environment';
 
 /**
  * Bump this to the library version if and only if the CX protocol changes.
@@ -65,28 +64,13 @@ export interface AssemblyManifest {
   readonly runtime?: AppRuntime;
 }
 
-/**
- * @deprecated use `AssemblyManifest`
- */
-export interface SynthesizeResponse extends AssemblyManifest {
-  readonly stacks: SynthesizedStack[];
-}
-
 /**
  * A complete synthesized stack
  */
 export interface SynthesizedStack {
   readonly name: string;
-  readonly environment: Environment;
-  readonly missing?: { [key: string]: MissingContext };
-  readonly metadata: StackMetadata;
+  readonly artifact: Artifact;
   readonly template: any;
-  readonly autoDeploy?: boolean;
-
-  /**
-   * Other stacks this stack depends on
-   */
-  readonly dependsOn?: string[];
 }
 
 /**
@@ -157,6 +141,7 @@ export const PATH_METADATA_KEY = 'aws:cdk:path';
 
 /**
  * Enables the embedding of the "aws:cdk:path" in CloudFormation template metadata.
+ * and also logical IDs in construct metadata.
  */
 export const PATH_METADATA_ENABLE_CONTEXT = 'aws:cdk:enable-path-metadata';
 
@@ -177,3 +162,8 @@ export const OUTFILE_NAME = 'cdk.out';
  * Disable the collection and reporting of version information.
  */
 export const DISABLE_VERSION_REPORTING = 'aws:cdk:disable-version-reporting';
+
+/**
+ * Will not include stack trace information in construct metadata.
+ */
+export const DISABLE_STACK_TRACE = 'aws:cdk:disable-stack-trace';
diff --git a/packages/@aws-cdk/cx-api/lib/environment.ts b/packages/@aws-cdk/cx-api/lib/environment.ts
index 6dac39a141f27..36c919cec4ffe 100644
--- a/packages/@aws-cdk/cx-api/lib/environment.ts
+++ b/packages/@aws-cdk/cx-api/lib/environment.ts
@@ -2,9 +2,6 @@
  * Models an AWS execution environment, for use within the CDK toolkit.
  */
 export interface Environment {
-  /** The arbitrary name of this environment (user-set, or at least user-meaningful) */
-  readonly name: string;
-
   /** The 12-digit AWS account ID for the account this environment deploys into */
   readonly account: string;
 
diff --git a/tools/pkglint/lib/rules.ts b/tools/pkglint/lib/rules.ts
index 63d7502c20d00..59dae337392fe 100644
--- a/tools/pkglint/lib/rules.ts
+++ b/tools/pkglint/lib/rules.ts
@@ -4,7 +4,8 @@ import path = require('path');
 import semver = require('semver');
 import { LICENSE, NOTICE } from './licensing';
 import { PackageJson, ValidationRule } from './packagejson';
-import { deepGet, deepSet, expectDevDependency, expectJSON, fileShouldBe, fileShouldContain, findInnerPackages, monoRepoVersion } from './util';
+import { deepGet, deepSet, expectDevDependency, expectJSON, expectJSONOneOf,
+  fileShouldBe, fileShouldContain, findInnerPackages, monoRepoVersion } from './util';
 
 /**
  * Verify that the package name matches the directory name
@@ -16,8 +17,8 @@ export class PackageNameMatchesDirectoryName extends ValidationRule {
     const parts = pkg.packageRoot.split(path.sep);
 
     const expectedName = parts[parts.length - 2].startsWith('@')
-               ? parts.slice(parts.length - 2).join('/')
-               : parts[parts.length - 1];
+      ? parts.slice(parts.length - 2).join('/')
+      : parts[parts.length - 1];
 
     expectJSON(this.name, pkg, 'name', expectedName);
   }
@@ -171,7 +172,6 @@ export class JSIIJavaPackageIsRequired extends ValidationRule {
     if (!isJSII(pkg)) { return; }
 
     const moduleName = cdkModuleName(pkg.json.name);
-
     expectJSON(this.name, pkg, 'jsii.targets.java.maven.groupId', 'software.amazon.awscdk');
     expectJSON(this.name, pkg, 'jsii.targets.java.maven.artifactId', moduleName.mavenArtifactId, /-/g);
 
@@ -303,6 +303,7 @@ export class NoAtTypesInDependencies extends ValidationRule {
 function cdkModuleName(name: string) {
   const isCdkPkg = name === '@aws-cdk/cdk';
 
+  name = name.replace(/^@aws-cdk\/cdk-/, '');
   name = name.replace(/^aws-cdk-/, '');
   name = name.replace(/^@aws-cdk\//, '');
 
@@ -530,9 +531,9 @@ export class MustUseCDKTest extends ValidationRule {
     if (!shouldUseCDKBuildTools(pkg)) { return; }
     if (!hasTestDirectory(pkg)) { return; }
 
-    expectJSON(this.name, pkg, 'scripts.test', 'cdk-test');
+    expectJSONOneOf(this.name, pkg, 'scripts.test', [ 'cdk-test', 'jest' ]);
 
-    // 'cdk-test' will calculate coverage, so have the appropriate
+    // 'cdk-test' or 'jest' will calculate coverage, so have the appropriate
     // files in .gitignore.
     fileShouldContain(this.name, pkg, '.gitignore', '.nyc_output');
     fileShouldContain(this.name, pkg, '.gitignore', 'coverage');
diff --git a/tools/pkglint/lib/util.ts b/tools/pkglint/lib/util.ts
index fe96d8903a046..a8febbeb77f1b 100644
--- a/tools/pkglint/lib/util.ts
+++ b/tools/pkglint/lib/util.ts
@@ -3,16 +3,29 @@ import path = require('path');
 import { PackageJson } from "./packagejson";
 
 /**
- * Expect a particular JSON key to be a given value
+ * Expect a particular JSON key to be a given one of the allowed values.
+ * Fixable if oneOf contains a single value.
  */
-export function expectJSON(ruleName: string, pkg: PackageJson, jsonPath: string, expected: any, ignore?: RegExp, caseInsensitive: boolean = false) {
+export function expectJSONOneOf(ruleName: string, pkg: PackageJson, jsonPath: string, oneOf: any[],
+                                ignore?: RegExp, caseInsensitive: boolean = false) {
+
   const parts = jsonPath.split('.');
   const actual = deepGet(pkg.json, parts);
-  if (applyCaseInsensitive(applyIgnore(actual)) !== applyCaseInsensitive(applyIgnore(expected))) {
+
+  let found = false;
+  for (const expected of oneOf) {
+    if (applyCaseInsensitive(applyIgnore(actual)) === applyCaseInsensitive(applyIgnore(expected))) {
+      found = true;
+    }
+  }
+
+  if (!found) {
+    const fix = oneOf.length > 1 ? undefined : () => { deepSet(pkg.json, parts, oneOf[0]); };
+
     pkg.report({
       ruleName,
-      message: `${jsonPath} should be ${JSON.stringify(expected)}${ignore ? ` (ignoring ${ignore})` : ''}, is ${JSON.stringify(actual)}`,
-      fix: () => { deepSet(pkg.json, parts, expected); }
+      message: `${jsonPath} should be one of ${JSON.stringify(oneOf)}${ignore ? ` (ignoring ${ignore})` : ''}, is ${JSON.stringify(actual)}`,
+      fix
     });
   }
 
@@ -29,6 +42,10 @@ export function expectJSON(ruleName: string, pkg: PackageJson, jsonPath: string,
   }
 }
 
+export function expectJSON(ruleName: string, pkg: PackageJson, jsonPath: string, expected: any, ignore?: RegExp, caseInsensitive: boolean = false) {
+  expectJSONOneOf(ruleName, pkg, jsonPath, [ expected ], ignore, caseInsensitive);
+}
+
 /**
  * Export a package-level file to contain a given line
  */