Stream has no exports

tsc fails to compile, StreamEventSource, StreamEventSourceProps missing from aws-lambda-event-sources streams file.

Reproduction Steps

npm install @aws-cdk/core
npm install @aws-cdk/aws-lambda-event-sources
tsc

Error Log

node_modules/@aws-cdk/aws-lambda-event-sources/lib/dynamodb.d.ts:3:10 - error TS2305: Module '"./stream"' has no exported member 'StreamEventSource'.

3 import { StreamEventSource, StreamEventSourceProps } from './stream';
           ~~~~~~~~~~~~~~~~~

node_modules/@aws-cdk/aws-lambda-event-sources/lib/dynamodb.d.ts:3:29 - error TS2305: Module '"./stream"' has no exported member 'StreamEventSourceProps'.

3 import { StreamEventSource, StreamEventSourceProps } from './stream';
                              ~~~~~~~~~~~~~~~~~~~~~~

node_modules/@aws-cdk/aws-lambda-event-sources/lib/kinesis.d.ts:3:10 - error TS2305: Module '"./stream"' has no exported member 'StreamEventSource'.

3 import { StreamEventSource, StreamEventSourceProps } from './stream';
           ~~~~~~~~~~~~~~~~~

node_modules/@aws-cdk/aws-lambda-event-sources/lib/kinesis.d.ts:3:29 - error TS2305: Module '"./stream"' has no exported member 'StreamEventSourceProps'.

3 import { StreamEventSource, StreamEventSourceProps } from './stream';
                              ~~~~~~~~~~~~~~~~~~~~~~

Environment

• **CLI Version :10.
• **Framework Version: 10.1.
• **OS :MacOS
• **Language : TypeScript

Other

Digging around the node_modules/@aws-cdk/aws-lambda-event-sources/lib/stream.d.ts file shows no exports

---

This is 🐛 Bug Report

[ashwgupt]

We also faced the same issue even when not using either of the Kinesis and Dynamo streams but only SqsEventSource.

Looking at the change log of 1.11.0, the merged work of https://github.com/aws/aws-cdk/pull/4260 has removed redundant code in KinesisEventSource and DynamoEventSource into common StreamEventSource, and that looks like causing it.

[nmussy]

Here is an immediate fix in the meantime, using patch-package:

npm i patch-package

tee node_modules/@aws-cdk/aws-lambda-event-sources/lib/stream.d.ts << TS
import lambda = require('@aws-cdk/aws-lambda');
import cdk = require('@aws-cdk/core');
export interface StreamEventSourceProps {
  readonly batchSize?: number;
  readonly startingPosition: lambda.StartingPosition;
  readonly maxBatchingWindow?: cdk.Duration;
}

export declare abstract class StreamEventSource implements lambda.IEventSource {
  readonly props: StreamEventSourceProps;

  protected constructor(props: StreamEventSourceProps);
  public bind(_target: lambda.IFunction): void;
  protected enrichMappingOptions(options: lambda.EventSourceMappingOptions): lambda.EventSourceMappingOptions;
}
TS

npx patch-package @aws-cdk/aws-lambda-event-sources
git add patches/@aws-cdk+aws-lambda-event-sources+1.11.0.patch && git commit

You’ll need to add "postinstall": "patch-package" to your package.json scripts field to ensure that the patch will run after each installation.

Hope that helps!