Mastering TypeScript 3 - Third Edition

TypeScript Lambda functions

The sample Lambda function that Serverless has created for us is in a standard JavaScript file named handler.js. Let's now look at how we can use TypeScript to generate a compatible JavaScript file that can be used as a Lambda function. To start off with, let's first initialize npm within this directory as follows:

npm init  

This command will create a packages.json file within the serverless-sample directory, so that we can use it to install any node modules that we may need. We can then initialize TypeScript within this directory as per usual:

tsc --init  

This will create a tsconfig.json file, which is ready for TypeScript compilation. To use Lambda functions within TypeScript, we will need to install two packages, ...