What is the process of defining a TypeScript AWS Lambda handler for Lambda Function URLs?

Question

What is the process of defining a TypeScript AWS Lambda handler for Lambda Function URLs?

The npm package @types/aws-lambda provides TypeScript declarations for different ways Lambda functions can be triggered. For instance, when triggering the Lambda function through API Gateway, you can use the following code snippet:

import { APIGatewayProxyHandler } from "aws-lambda";

export const handler: APIGatewayProxyHandler = async (
  event,
  context,
  callback
) => {
   ...
}

Using this code snippet ensures that event, context, and callback have the correct types.

Can you provide the equivalent code if the handler is triggered via Lambda Function URLs?

typescript aws-lambda

Answer 1

Answer №1

Since November 2023, a new type called LambdaFunctionURLHandler has been introduced in the @types/aws-lambda npm package. You can find the source on Github.

To enable type checking in TypeScript, you can use the following:

import { LambdaFunctionURLHandler } from 'aws-lambda';
export const handler: LambdaFunctionURLHandler = async (event) => {
  // handler code
}

In JavaScript, you can specify the type of the handler using JSDoc like this:

/** @type import('aws-lambda').LambdaFunctionURLHandler */
export const handler = async (event) => {
  // handler code
}

This is particularly useful if you are working on JS code in a code editor that supports type annotations, and if you are uploading Lambda code directly to AWS without transpiling.

Answer 2

Since November 2023, a new type called LambdaFunctionURLHandler has been introduced in the @types/aws-lambda npm package. You can find the source on Github.

To enable type checking in TypeScript, you can use the following:

import { LambdaFunctionURLHandler } from 'aws-lambda';
export const handler: LambdaFunctionURLHandler = async (event) => {
  // handler code
}

In JavaScript, you can specify the type of the handler using JSDoc like this:

/** @type import('aws-lambda').LambdaFunctionURLHandler */
export const handler = async (event) => {
  // handler code
}

This is particularly useful if you are working on JS code in a code editor that supports type annotations, and if you are uploading Lambda code directly to AWS without transpiling.

Answer 3

Answer №2

In summary, the Lambda function URL event type aligns with the API Gateway event type.
Referencing the AWS Lambda developer guide

When your function URL is accessed by a client, Lambda converts the request into an event object before passing it to your function. The response from your function is then converted back to an HTTP response which Lambda sends to the client via the function URL.
Both the request and response event formats adhere to the same schema as the Amazon API Gateway payload format version 2.0.

Answer 4

In summary, the Lambda function URL event type aligns with the API Gateway event type.
Referencing the AWS Lambda developer guide

When your function URL is accessed by a client, Lambda converts the request into an event object before passing it to your function. The response from your function is then converted back to an HTTP response which Lambda sends to the client via the function URL.
Both the request and response event formats adhere to the same schema as the Amazon API Gateway payload format version 2.0.

What is the process of defining a TypeScript AWS Lambda handler for Lambda Function URLs?

Answer №1

Answer №2

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