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Bundle Lambdas in parallel for CDK nodejs typescript
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| import { build } from "esbuild"; | |
| import * as glob from "glob"; | |
| import * as path from "path"; | |
| import { promises as fs } from "fs"; // Use the promises API of fs | |
| const handlersDir = "{PATH_TO_LAMBDA_FOLDER}"; | |
| export async function bundleLambdas() { | |
| const start = performance.now(); | |
| await clearDist(); | |
| const entryFiles = ( | |
| await Promise.all( | |
| glob.sync(`${handlersDir}/**/*.ts`, { dot: true }).map(async (file) => { | |
| return (await hasHandlerFunction(file)) ? file : null; | |
| }), | |
| ) | |
| ).filter(Boolean); // This will filter out null values, leaving only files with exports.handler | |
| const buildTasks = entryFiles.map((file: any) => { | |
| const relativePath = path.relative(handlersDir, file); | |
| const directoryName = path.dirname(relativePath); | |
| const fileNameWithoutExtension = path.basename(file, ".ts"); | |
| return build({ | |
| entryPoints: [file], | |
| bundle: true, | |
| outdir: `./dist/${directoryName}/${fileNameWithoutExtension}`, | |
| platform: "node", | |
| external: ["@aws-sdk/*"], | |
| }); | |
| }); | |
| // Run all builds in parallel | |
| await Promise.all(buildTasks) | |
| .then(() => { | |
| const end = performance.now(); | |
| const duration = (end - start) / 1000; | |
| console.error(`\n✨ Lambda Bundle time: ${duration.toFixed(2)}s\n`); | |
| }) | |
| .catch((err) => { | |
| console.error("Build error:", err); | |
| process.exit(1); | |
| }); | |
| } | |
| async function clearDist() { | |
| try { | |
| await fs.rm("./dist", { recursive: true }); | |
| } catch (err) { | |
| console.error("Error clearing dist folder:"); | |
| } | |
| try { | |
| await fs.mkdir("./dist", { recursive: true }); | |
| } catch { | |
| console.error("Error creating dist folder:"); | |
| } | |
| } | |
| async function hasHandlerFunction(file: any) { | |
| const content = await fs.readFile(file, "utf-8"); | |
| return content.includes("exports.handler"); | |
| } | |
| bundleLambdas(); |
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| // bundle lambdas before running cdk root file | |
| { | |
| "app": "npx ts-node bin/bundleLambdas.ts && npx ts-node --prefer-ts-exts bin/cdk-main.ts", | |
| //... | |
| } |
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| // use fromAsset to grab prebuilt lambda | |
| const lambdaFunction = new lambda.Function(this, ${id}`, { | |
| code: lambda.Code.fromAsset(`dist/${id}`), | |
| handler: `${id.split("/").pop()}.handler`, | |
| runtime: lambda.Runtime.NODEJS_18_X | |
| } |
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