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Passing a JS/TS lambda handler by reference instead of src path #1068

@maciejgoscinski

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@maciejgoscinski

Hello!

At the moment, the only way to connect a lambda handler function to an APIGw route (or Function construct) is to pass it as a string path:
src/blabla/certainLambdasFile.handlerFunction. This is consistent with how CloudFormation refers to the handler method, but otherwise pretty gimmicky as something to be written "by hand".

When working in an all-typescript project, possibly a monorepo, it would be super handy to pass the handler by reference:

import { handlerFunction} from 'src/blabla/certainLambdasFile';

// ...
'GET /myLambda' : handlerFunction
// ..

There's been a discussion on Slack explaining it's rather difficult from the architecture standpoint.

Perhaps it would be possible to bypass the architectural problems, by "cheating" at build-time, swapping the references with their paths?

Also, is a "freely dangling" exported function the only way to export a handler? Would a class method, or the following syntax be possible anyhow?

export function MyLambdas() {
   function handler() { }

   return { handler }
}

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