feat(nx): add ability to ignore files from affected commands

docs/angular/fundamentals/monorepos-automation.md

@@ -341,6 +341,8 @@ The `tags` array is used to impose constraints on the dependency graph. Read mor
 
 Nx uses its advanced code analysis to construct a dependency graph of all applications and libraries. Some dependencies, however, cannot be determined statically. You can use the `implicitDependencies` array to list the dependencies that cannot be determined statically.
 
+> Note: Glob patterns in the `.gitignore` and `.nxignore` files are ignored during affected commands by default.
+
 ## Summary
 
 With Nx, you can use effective development practices pioneered at Google:

docs/shared/monorepo-affected.md

@@ -189,3 +189,10 @@ You can also specify dependencies between projects. For instance, if `admin-e2e`
   }
 }
 ```
+
+### Ignoring Additional Files from Affected Commands
+
+Nx provides two methods to exclude additional glob patterns (files and folders) from `affected:*` commands.
+
+- Glob patterns defined in your `.gitignore` file are ignored.
+- Glob patterns defined in an optional `.nxignore` file are ignored.

docs/web/fundamentals/monorepos-automation.md

@@ -342,6 +342,8 @@ The `tags` array is used to impose constraints on the dependency graph. Read mor
 
 Nx uses its advanced code analysis to construct a dependency graph of all applications and libraries. Some dependencies, however, cannot be determined statically. You can use the `implicitDependencies` array to list the dependencies that cannot be determined statically.
 
+> Note: Glob patterns in the `.gitignore` and `.nxignore` files are ignored during affected commands by default.
+
 ## Summary
 
 With Nx, you can use effective development practices pioneered at Google:

packages/workspace/src/command-line/shared.ts

@@ -43,8 +43,14 @@ function readFileIfExisting(path: string) {
   return fs.existsSync(path) ? fs.readFileSync(path, 'UTF-8').toString() : '';
 }
 
-const ig = ignore();
-ig.add(readFileIfExisting(`${appRootPath}/.gitignore`));
+function getIgnoredGlobs() {
+  const ig = ignore();
+
+  ig.add(readFileIfExisting(`${appRootPath}/.gitignore`));
+  ig.add(readFileIfExisting(`${appRootPath}/.nxignore`));
+
+  return ig;
+}
 
 export function printArgsWarning(options: YargsAffectedOptions) {
   const { files, uncommitted, untracked, base, head, all } = options;
@@ -441,16 +447,16 @@ export function getProjectRoots(projectNames: string[]): string[] {
 export function allFilesInDir(
   dirName: string
 ): { file: string; mtime: number }[] {
-  // Ignore .gitignored files
-  if (ig.ignores(path.relative(appRootPath, dirName))) {
+  const ignoredGlobs = getIgnoredGlobs();
+  if (ignoredGlobs.ignores(path.relative(appRootPath, dirName))) {
     return [];
   }
 
   let res = [];
   try {
     fs.readdirSync(dirName).forEach(c => {
       const child = path.join(dirName, c);
-      if (ig.ignores(path.relative(appRootPath, child))) {
+      if (ignoredGlobs.ignores(path.relative(appRootPath, child))) {
         return;
       }
       try {