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feat: Add TypeScriptCodeCollection for building multiple Lambda functions #1701

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38248db
feat: Add TypeScriptCodeCollection for building multiple Lambda funct…
Keshav-63 Feb 14, 2026
f95c50a
feat: Add TypeScriptCodeCollection for multi-Lambda builds
Keshav-63 Feb 14, 2026
2f659fb
feat: Add TypeScriptCodeCollection for building multiple Lambda funct…
Feb 17, 2026
f7bb156
fix: rename getXxx methods to property getters for JSII compatibility
Feb 17, 2026
59e5f21
chore: self mutation
github-actions[bot] Feb 17, 2026
1d8b1e1
Merge branch 'v5' into v5
Keshav-63 Feb 17, 2026
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273 changes: 273 additions & 0 deletions API.md
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41 changes: 41 additions & 0 deletions examples/typescript/multi-lambda/app.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,41 @@
import * as cdk from 'aws-cdk-lib';
import * as lambda from 'aws-cdk-lib/aws-lambda';
import { TypeScriptCodeCollection } from '@mrgrain/cdk-esbuild';

export class MultiLambdaStack extends cdk.Stack {
constructor(scope: cdk.App, id: string, props?: cdk.StackProps) {
super(scope, id, props);

const codeCollection = new TypeScriptCodeCollection(this, 'MultiLambda', {
entryPoints: {
'api': './src/api.ts',
'auth': './src/auth.ts',
'notifications': './src/notifications.ts',
},
buildOptions: {
minify: true,
},
});

new lambda.Function(this, 'ApiFunction', {
runtime: lambda.Runtime.NODEJS_18_X,
handler: 'api.handler',
code: codeCollection.getCode('api'),
});

new lambda.Function(this, 'AuthFunction', {
runtime: lambda.Runtime.NODEJS_18_X,
handler: 'auth.handler',
code: codeCollection.getCode('auth'),
});

new lambda.Function(this, 'NotificationsFunction', {
runtime: lambda.Runtime.NODEJS_18_X,
handler: 'notifications.handler',
Comment on lines +22 to +34
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Copilot AI Feb 17, 2026

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The handler references ('api.handler', 'auth.handler', 'notifications.handler') are incorrect for the current implementation. Since each entry point is bundled separately using individual TypeScriptCode instances, the output will be 'index.js' for each bundle, not 'api.js', 'auth.js', or 'notifications.js'. The handler should be 'index.handler' for all three Lambda functions.

This handler naming would only work if all entry points were bundled together in a single esbuild invocation with a Record<string, string> of entry points, which would preserve the entry point names in the output.

Suggested change
handler: 'api.handler',
code: codeCollection.getCode('api'),
});
new lambda.Function(this, 'AuthFunction', {
runtime: lambda.Runtime.NODEJS_18_X,
handler: 'auth.handler',
code: codeCollection.getCode('auth'),
});
new lambda.Function(this, 'NotificationsFunction', {
runtime: lambda.Runtime.NODEJS_18_X,
handler: 'notifications.handler',
handler: 'index.handler',
code: codeCollection.getCode('api'),
});
new lambda.Function(this, 'AuthFunction', {
runtime: lambda.Runtime.NODEJS_18_X,
handler: 'index.handler',
code: codeCollection.getCode('auth'),
});
new lambda.Function(this, 'NotificationsFunction', {
runtime: lambda.Runtime.NODEJS_18_X,
handler: 'index.handler',

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code: codeCollection.getCode('notifications'),
});
}
}

const app = new cdk.App();
new MultiLambdaStack(app, 'MultiLambdaStack');
18 changes: 18 additions & 0 deletions examples/typescript/multi-lambda/package.json
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{
"name": "multi-lambda-example",
"version": "1.0.0",
"description": "Example of building multiple Lambda functions with cdk-esbuild",
"main": "app.ts",
"scripts": {
"deploy": "cdk deploy",
"synth": "cdk synth"
},
"dependencies": {
"aws-cdk-lib": "^2.0.0",
"constructs": "^10.0.0",
"@mrgrain/cdk-esbuild": "^5.0.0"
},
"devDependencies": {
"typescript": "^5.0.0"
}
}
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Copilot AI Feb 17, 2026

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This example is missing several files that are present in other TypeScript examples and are necessary for the example to be functional:

  1. cdk.json - Required for CDK CLI to know how to execute the app. Without this, running cdk deploy or cdk synth won't work.
  2. tsconfig.json - Required for TypeScript compilation
  3. README.md - Helpful for users to understand how to use the example
  4. .gitignore - Standard practice for examples

For reference, see the examples/typescript/lambda/ directory which includes all these files.

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6 changes: 6 additions & 0 deletions examples/typescript/multi-lambda/src/api.ts
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export async function handler(event: any) {
return {
statusCode: 200,
body: JSON.stringify({ message: 'API Handler' }),
};
}
6 changes: 6 additions & 0 deletions examples/typescript/multi-lambda/src/auth.ts
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export async function handler(event: any) {
return {
statusCode: 200,
body: JSON.stringify({ message: 'Auth Handler' }),
};
}
6 changes: 6 additions & 0 deletions examples/typescript/multi-lambda/src/notifications.ts
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@@ -0,0 +1,6 @@
export async function handler(event: any) {
return {
statusCode: 200,
body: JSON.stringify({ message: 'Notifications Handler' }),
};
}
5 changes: 5 additions & 0 deletions src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -49,3 +49,8 @@ export {
TypeScriptSource,
TypeScriptSourceProps,
} from './source';

export {
TypeScriptCodeCollection,
TypeScriptCodeCollectionProps,
} from './typescript-code-collection';
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