Did you know that Netlify Functions are just using AWS Lambdas behind the scenes?

This means you can use the same type definitions available for aws-lambda for your Netlify functions too. Install the aws-lamda types by running the following.

npm install @types/aws-lambda --save-dev

You only need to import the APIGatewayProxyEvent, APIGatewayProxyCallback types like so.

import { APIGatewayProxyEvent, APIGatewayProxyCallback } from "aws-lambda";

export const handler = async function (
  event: APIGatewayProxyEvent,
  context: any,
  callback: APIGatewayProxyCallback
) {
  // Do some stuff here 
};

Note, there are no type declarations available for context as this includes properties and methods specific to Netlify such as Netlify Identity .

However, having auto completion for event alone makes this hugely useful!

I'm putting together some TypeScript Netlify Functions examples over at this repo. Feel free to give it a star if you find it helpful.