UserPoolTriggerEventSource

Source: src/AWS/Lambda/UserPoolTriggerEventSource.ts

Connects a Cognito user pool Lambda trigger to the current Lambda function.

At deploy time this layer injects the function ARN into the pool’s LambdaConfig through the pool’s binding contract and materializes the lambda:InvokeFunction Permission for cognito-idp.amazonaws.com; at runtime it dispatches matching trigger events (matched on userPoolId + triggerSource prefix) to the registered handler and returns the handler’s (mutated) event to Cognito.

Handling user pool triggers

yield* Cognito.onPreSignUp(pool, (event) =>
  Effect.sync(() => Cognito.autoConfirmUser(event, { verifyEmail: true })),
);