The header of the function specifies only one parameter, however the function call necessitates three

Within my Typescript code, I have a function defined as follows:

export const func: AWSLambda.APIGatewayProxyHandler = async (
  arg
): Promise<AWSLambda.APIGatewayProxyResult> => {

During a unit test, when I attempt to call this function like func(param1), I encounter an error message stating 

Expected 3 arguments, but got 1. handler.d.ts(86,5): An argument for 'context' was not provided.

I am puzzled by why it is expecting 3 arguments when the function header clearly specifies only one argument. Could this discrepancy be related to AWSLambda.APIGatewayProxyHandler or 

Promise<AWSLambda.APIGatewayProxyResult>
?

typescriptaws-lambdaaws-api-gateway

Answer №1

Here's a method I use to achieve what you're attempting. I find it interesting that your function definition isn't throwing a TS error.

import { APIGatewayProxyHandler, APIGatewayProxyResult } from 'aws-lambda'

export const handler: APIGatewayProxyHandler = async (
  event,
  context,
  callback,
): Promise<APIGatewayProxyResult> => {
  // Insert your code logic here
}

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