build: bundle the exact version of sharp from the yarn.lock into the …

…lambda-tiler bundle

packages/lambda-tiler/bundle.sh

@@ -4,8 +4,8 @@
 #
 ../../scripts/bundle.js package.json
 cd dist
+../scripts/create.deployment.package.js
 # Make the new package a commonjs module
-cat ../package.json | grep -v '"type": "module"' > package.json
 cp -r ../static .
 # @see https://sharp.pixelplumbing.com/en/stable/install/#aws-lambda
-npm install --arch=x64 --platform=linux sharp
+npm install --arch=x64 --platform=linux --production

packages/lambda-tiler/package.json

@@ -11,7 +11,7 @@
     "url": "https://linz.govt.nz",
     "organization": true
   },
-  "type": "module",
+  "type": "commonjs",
   "engines": {
     "node": "^12.20.0 || ^14.13.1 || >=16.0.0"
   },

packages/lambda-tiler/scripts/create.deployment.package.js

@@ -0,0 +1,34 @@
+#!/usr/bin/env node
+/**
+ * Create a pacakge.json for the `dist` bundle based off the parent package.json
+ *
+ * This is needed as libsharp has to be "installed" into the dist node_modules so that lambda has access to sharp
+ */
+const fs = require('fs');
+
+const parentPackage = JSON.parse(fs.readFileSync('../package.json').toString());
+
+// Find the exact version of a package in the yarn lock
+function getPackageVersion(packageName) {
+  const parentLock = fs.readFileSync('../../../yarn.lock').toString().split('\n');
+
+  for (let i = 0; i < parentLock.length; i++) {
+    if (parentLock[i].startsWith(packageName + '@')) {
+      const versionList = parentLock[i + 1].trim();
+      if (!versionList.startsWith('version ')) throw new Error('Failed to find sharp version');
+      return JSON.parse(versionList.slice('version '.length));
+    }
+  }
+}
+
+// the bundle is a commonjs module
+parentPackage.type = 'commonjs';
+parentPackage.main = 'index.js';
+parentPackage.dependencies = { sharp: getPackageVersion('sharp') };
+
+// Clean up
+delete parentPackage.types;
+delete parentPackage.devDependencies;
+
+console.log('Installing dependencies', parentPackage.dependencies);
+fs.writeFileSync('./package.json', JSON.stringify(parentPackage, null, 2));