Building Lambda functions with TypeScript

You can use the Node.js runtime to run TypeScript code in Amazon Lambda. Because Node.js doesn't run TypeScript code natively, you must first transpile your TypeScript code into JavaScript. Then, use the JavaScript files to deploy your function code to Lambda. Your code runs in an environment that includes the Amazon SDK for JavaScript, with credentials from an Amazon Identity and Access Management (IAM) role that you manage.

Lambda supports the following Node.js runtimes.

Setting up a TypeScript development environment

Use a local integrated development environment (IDE), text editor, or Amazon Cloud9 to write your TypeScript function code. You can’t create TypeScript code on the Lambda console.

To transpile your TypeScript code, set up a compiler such as esbuild or Microsoft's TypeScript compiler (tsc) , which is bundled with the TypeScript distribution. You can use the Amazon Serverless Application Model (Amazon SAM) or the Amazon Cloud Development Kit (Amazon CDK) to simplify building and deploying TypeScript code. Both tools use esbuild to transpile TypeScript code into JavaScript.

When using esbuild, consider the following:

 {
  "compilerOptions": {
    "target": "es2020",
    "strict": true,
    "preserveConstEnums": true,
    "noEmit": true,
    "sourceMap": false,
    "module":"commonjs",
    "moduleResolution":"node",
    "esModuleInterop": true, 
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true, 
    "isolatedModules": true, 
  },
  "exclude": ["node_modules", "**/*.test.ts"]
}