Add endpointAdapter to Lambda adapter

[jpwilliams]

Summary

Add a Lambda Durable Endpoints adapter.

import { Inngest, step } from "inngest";
import { endpointAdapter } from "inngest/lambda";

const inngest = new Inngest({
  id: "my-app",
  endpointAdapter,
});

// Your durable endpoint Lambda handler
export const handler = inngest.endpoint(async (event, context) => {
  const result = await step.run("work", () => "done");

  return {
    statusCode: 200,
    body: JSON.stringify({ result }),
  };
});

Checklist

• Added a docs PR that references this PR N/A post-merge
• Added unit/integration tests
• Added changesets if applicable

Related

• EXE-834 Add endpointAdapter to Express adapter #1293 (Express adapter)
• EXE-835 Add endpointAdapter to Node.js adapter #1294 (Node.js adapter)

[changeset-bot]

🦋 Changeset detected

Latest commit: 52b13b5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
inngest	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[inngest-release-bot]

A user has added the prerelease/inngest label, so this PR will be published to npm with the tag pr-1299. It will be updated with the latest changes as you push commits to this PR.

You can install this prerelease version with:

npm install inngest@pr-1299

The last release was built and published from 7482e01.

[Copilot]

Pull request overview

Adds Durable Endpoints support to the AWS Lambda adapter by introducing an endpointAdapter (plus a proxy handler) so Lambda handlers can run step.run() safely and support async redirect + polling via endpointProxy().

Changes:

• Refactors Lambda comm-handler creation to be shared between serve() and endpointAdapter.
• Adds endpointAdapter and a durable endpoint proxy handler for Lambda/API Gateway v1/v2 events.
• Adds a changeset and extends Lambda tests to cover the endpoint adapter proxy flow.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/inngest/src/lambda.ts	Adds endpointAdapter, durable proxy handler, and shared comm-handler factory for serve + sync endpoints.
packages/inngest/src/lambda.test.ts	Adds endpoint adapter tests (proxy invocation), but currently references a missing helper.
.changeset/lambda-endpoint-adapter.md	Declares a minor release for adding Lambda endpointAdapter.

Comments suppressed due to low confidence (1)

packages/inngest/src/lambda.ts:94

• event.headers can be null for API Gateway v1 events (per aws-lambda types). Calling Object.entries(event.headers) will throw at runtime in that case. Default to an empty object before iterating/normalizing headers.

      // Create a map of headers
      const headersMap = new Map<string, string | undefined>([
        ...Object.entries(event.headers).map(
          ([key, value]) =>
            [key.toLowerCase().trim(), value] as [string, string | undefined],

---

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[Copilot]

./test/testEndpointAdapter.ts is imported but no such file exists under packages/inngest/src/test (and test/helpers.ts doesn’t export it either). This will break TypeScript/vitest compilation. Add the missing helper file, or change the import to the correct existing helper/export.

Suggested change

	import { testEndpointAdapter } from "./test/testEndpointAdapter.ts";
	function testEndpointAdapter(
	name: string,
	_endpointAdapter: unknown,
	_options: {
	invokeProxy: (
	client: any,
	args: { url: string; method: string },
	) => Promise<{
	status: number;
	body: string;
	headers: Record<string, string>;
	}>;
	},
	): void {
	// Placeholder implementation to satisfy TypeScript/vitest compilation
	// when the shared test helper module is not available in this package.
	// The parameters are intentionally marked as used to avoid lint errors.
	void name;
	}