Outdated experiment

Use Bun's official custom AWS Lambda runtime layer

This repository is an outdated experiment superceded by https://github.com/oven-sh/bun/tree/main/packages/bun-lambda.

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Original readme

This is a hacky attempt to get Bun to run on AWS Lambda. Don't know yet if it will be officially supported in the future. I'm just trying things.

./lambda.ts has the code necessary to respond to incoming requests in an AWS Lambda instance.

./function.js runs the user's code. It is expected that the user's code export default a fetch function like so:

export default {
  fetch(req) {
    return new Response("my response");
  },
};

In releases, you'll find a fully static build of Bun for Linux x64. This works around gnu libc incompatibilities with Lambda, but it statically links glibc which is a big no-no for several reasons (DNS resolution may not work, for example). That's what makes this, at the very best, a proof of concept and not something that should be used in production.

To deploy, zip up this folder along with the special bun binary and upload it to Lambda.

aws lambda create-function \
            --zip-file fileb://deployment.zip --handler function.handler --runtime provided \
            --role $MY_ARN_ROLE \
            --function-name $MY_FUNCTION_NAME