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feat(aws): Create unified lambda layer for ESM and CJS (#17012)
This introduces a new AWS lambda layer that supports both ESM and CJS. Instead of bundling the whole SDK, we install the local NPM package and then prune all not strictly necessary files from `node_modules` by using `@vercel/nft` to keep the layer size as small as possible. closes #16876 closes #16883 closes #16886 closes #16879
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‎dev-packages/e2e-tests/test-applications/aws-lambda-layer-esm/.npmrc‎

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@sentry:registry=http://127.0.0.1:4873
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@sentry-internal:registry=http://127.0.0.1:4873

‎dev-packages/e2e-tests/test-applications/aws-lambda-layer-esm/package.json‎

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{
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"name": "aws-lambda-layer-esm",
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"version": "1.0.0",
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"private": true,
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"scripts": {
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"start": "node src/run.mjs",
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"test": "playwright test",
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"clean": "npx rimraf node_modules pnpm-lock.yaml",
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"test:build": "pnpm install",
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"test:assert": "pnpm test"
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},
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"//": "Link from local Lambda layer build",
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"dependencies": {
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"@sentry/aws-serverless": "link:../../../../packages/aws-serverless/build/aws/dist-serverless/nodejs/node_modules/@sentry/aws-serverless"
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},
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"devDependencies": {
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"@sentry-internal/test-utils": "link:../../../test-utils",
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"@playwright/test": "~1.53.2"
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},
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"volta": {
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"extends": "../../package.json"
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}
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}

‎dev-packages/e2e-tests/test-applications/aws-lambda-layer-esm/playwright.config.ts‎

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import { getPlaywrightConfig } from '@sentry-internal/test-utils';
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export default getPlaywrightConfig();

‎dev-packages/e2e-tests/test-applications/aws-lambda-layer-esm/src/lambda-function.mjs‎

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import * as Sentry from '@sentry/aws-serverless';
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import * as http from 'node:http';
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async function handle() {
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await Sentry.startSpan({ name: 'manual-span', op: 'test' }, async () => {
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await new Promise(resolve => {
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http.get('http://example.com', res => {
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res.on('data', d => {
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process.stdout.write(d);
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});
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res.on('end', () => {
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resolve();
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});
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});
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});
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});
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}
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export { handle };

‎dev-packages/e2e-tests/test-applications/aws-lambda-layer-esm/src/run-lambda.mjs‎

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import { handle } from './lambda-function.mjs';
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const event = {};
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const context = {
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invokedFunctionArn: 'arn:aws:lambda:us-east-1:123453789012:function:my-lambda',
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functionName: 'my-lambda',
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};
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await handle(event, context);

‎dev-packages/e2e-tests/test-applications/aws-lambda-layer-esm/src/run.mjs‎

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import child_process from 'node:child_process';
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child_process.execSync('node ./src/run-lambda.mjs', {
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stdio: 'inherit',
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env: {
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...process.env,
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// On AWS, LAMBDA_TASK_ROOT is usually /var/task but for testing, we set it to the CWD to correctly apply our handler
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LAMBDA_TASK_ROOT: process.cwd(),
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_HANDLER: 'src/lambda-function.handle',
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NODE_OPTIONS: '--import @sentry/aws-serverless/awslambda-auto',
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SENTRY_DSN: 'http://public@localhost:3031/1337',
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SENTRY_TRACES_SAMPLE_RATE: '1.0',
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SENTRY_DEBUG: 'true',
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},
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cwd: process.cwd(),
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});

‎dev-packages/e2e-tests/test-applications/aws-lambda-layer-esm/start-event-proxy.mjs‎

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import { startEventProxyServer } from '@sentry-internal/test-utils';
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startEventProxyServer({
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port: 3031,
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proxyServerName: 'aws-lambda-layer-esm',
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});

‎dev-packages/e2e-tests/test-applications/aws-lambda-layer-esm/tests/basic.test.ts‎

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import * as child_process from 'child_process';
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import { expect, test } from '@playwright/test';
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import { waitForTransaction } from '@sentry-internal/test-utils';
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test('Lambda layer SDK bundle sends events', async ({ request }) => {
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const transactionEventPromise = waitForTransaction('aws-lambda-layer-esm', transactionEvent => {
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return transactionEvent?.transaction === 'my-lambda';
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});
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// Waiting for 1s here because attaching the listener for events in `waitForTransaction` is not synchronous
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// Since in this test, we don't start a browser via playwright, we don't have the usual delays (page.goto, etc)
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// which are usually enough for us to never have noticed this race condition before.
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// This is a workaround but probably sufficient as long as we only experience it in this test.
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await new Promise<void>(resolve =>
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setTimeout(() => {
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resolve();
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}, 1000),
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);
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child_process.execSync('pnpm start', {
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stdio: 'ignore',
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});
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const transactionEvent = await transactionEventPromise;
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// shows the SDK sent a transaction
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expect(transactionEvent.transaction).toEqual('my-lambda'); // name should be the function name
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expect(transactionEvent.contexts?.trace).toEqual({
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data: {
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'sentry.sample_rate': 1,
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'sentry.source': 'custom',
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'sentry.origin': 'auto.otel.aws-lambda',
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'sentry.op': 'function.aws.lambda',
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'cloud.account.id': '123453789012',
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'faas.id': 'arn:aws:lambda:us-east-1:123453789012:function:my-lambda',
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'faas.coldstart': true,
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'otel.kind': 'SERVER',
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},
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op: 'function.aws.lambda',
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origin: 'auto.otel.aws-lambda',
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span_id: expect.stringMatching(/[a-f0-9]{16}/),
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status: 'ok',
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trace_id: expect.stringMatching(/[a-f0-9]{32}/),
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});
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expect(transactionEvent.spans).toHaveLength(2);
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// shows that the Otel Http instrumentation is working
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expect(transactionEvent.spans).toContainEqual(
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expect.objectContaining({
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data: expect.objectContaining({
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'sentry.op': 'http.client',
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'sentry.origin': 'auto.http.otel.http',
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url: 'http://example.com/',
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}),
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description: 'GET http://example.com/',
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op: 'http.client',
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}),
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);
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// shows that the manual span creation is working
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expect(transactionEvent.spans).toContainEqual(
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expect.objectContaining({
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data: expect.objectContaining({
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'sentry.op': 'test',
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'sentry.origin': 'manual',
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}),
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description: 'manual-span',
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op: 'test',
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}),
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);
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});

‎dev-packages/rollup-utils/bundleHelpers.mjs‎

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plugins: [rrwebBuildPlugin, markAsBrowserBuildPlugin],
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};
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// used by `@sentry/aws-serverless`, when creating the lambda layer
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const awsLambdaBundleConfig = {
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output: {
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format: 'cjs',
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},
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plugins: [
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jsonPlugin,
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commonJSPlugin,
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// Temporary fix for the lambda layer SDK bundle.
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// This is necessary to apply to our lambda layer bundle because calling `new ImportInTheMiddle()` will throw an
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// that `ImportInTheMiddle` is not a constructor. Instead we modify the code to call `new ImportInTheMiddle.default()`
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// TODO: Remove this plugin once the weird import-in-the-middle exports are fixed, released and we use the respective
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// version in our SDKs. See: https://github.com/getsentry/sentry-javascript/issues/12009#issuecomment-2126211967
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{
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name: 'aws-serverless-lambda-layer-fix',
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transform: code => {
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if (code.includes('ImportInTheMiddle')) {
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return code.replaceAll(/new\s+(ImportInTheMiddle.*)\(/gm, 'new $1.default(');
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}
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},
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},
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],
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// Don't bundle any of Node's core modules
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external: builtinModules,
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};
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const workerBundleConfig = {
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output: {
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format: 'esm',
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const bundleTypeConfigMap = {
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standalone: standAloneBundleConfig,
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addon: addOnBundleConfig,
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'aws-lambda': awsLambdaBundleConfig,
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'node-worker': workerBundleConfig,
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};
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‎packages/aws-serverless/package.json‎

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"/build/loader-hook.mjs"
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],
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"main": "build/npm/cjs/index.js",
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"module": "build/npm/esm/index.js",
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"types": "build/npm/types/index.d.ts",
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"exports": {
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"./package.json": "./package.json",
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"@types/aws-lambda": "^8.10.62"
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},
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"devDependencies": {
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"@types/node": "^18.19.1"
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"@types/node": "^18.19.1",
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"@vercel/nft": "^0.29.4"
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},
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"scripts": {
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"build": "run-p build:transpile build:types build:bundle",
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"build": "run-p build:transpile build:types",
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"build:bundle": "yarn build:layer",
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"build:layer": "yarn ts-node scripts/buildLambdaLayer.ts",
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"build:dev": "run-p build:transpile build:types",

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