5-data-source.ts

private createOutputDataSource(
    api: appsync.CfnGraphQLApi, 
    outputLambda: lambda.Function,
): appsync.CfnDataSource {
    const name = 'OutputDataSource';
    const invokeRole = this.createOutputLambdaInvokeRole(outputLambda);
    const outputDataSource = new appsync.CfnDataSource(this, name, {
        apiId: api.attrApiId,
        name: name,
        type: 'AWS_LAMBDA',
        lambdaConfig: {
            lambdaFunctionArn: outputLambda.functionArn
        },
        serviceRoleArn: invokeRole.roleArn
    });

    outputDataSource.addDependsOn(api);

    return outputDataSource;
}