Using netlify functions

Actually relatively straightforward.

In the file netlify/functions/hello.ts.

you have the following code

import { Handler, HandlerEvent, HandlerContext } from `netlify/functions`;

const handler: Handler = async (event: HandlerEvent, context: HandlerContext) => {
  return {
    statusCode: 200,
    body: JSON.stringify({ message: "Hello World" }),
  };
};

export { handler };

You need the following packages

npm install --save-dev typescript && npm install @netlify/functions
# set up typescript
npx tsc --init
# maybe use netlify cli for development
npm install --save-dev netlify-cli

The following configuration is necessary for typescript.

{
...
  "compilerOptions":{
  ...
    "esModuleInterop" :true,
    "isolatedModules" :true,
  ...
  }
}

With the netlify cli you can start a local development server

npx netlify dev

Deployed just like a frontend via git push from repo.

The usual things are needed:

• create a repo
• push your code
• connect to netlify site to github repo

The url of the function should then be <something>.netlify.app/.netlify/functions/hello.

By default, all functions are provided with:

• us-east-1 AWS Lambda region.
• 1024 MB memory
• 10 seconds execution limit for synchronous functions, including scheduled functions. 6 MB for request and response payload for synchronous functions. 256 KB for the size of the payload of request and response for background functions

If that's too little, then there are background Functions and in beta Edge Functions (which run in Deno instead of Nodejs and are deployed globally)