api-gateway: Immutable Constructs cannot be used for LambdaProxyIntegration and addRoutes

[dariusjs]

❓ General Issue

The Question

Similar to issue #6885 I've found that for the api-gatewayv2 the higher level constructs don't allow immutable objects. In the below code example "Functuon.fromFunctionArn" is a immutable construct.

The work around I copied form issue 6885 is as below. The commented out lines are the ones that are unsupported immutables.

const lambda = Function.fromFunctionArn(this, "lambda", importedLambdaArn);

const lambdaIntegration = new LambdaProxyIntegration({
  // handler: lambda
  handler: Object.defineProperty(lambda, Symbol.for('constructs.Construct.node'), {
    value: (lambda.node as any)._actualNode,
  }),
});


const httpApi = new HttpApi(this, 'HttpApi', {
  apiName: 'http-api',
});


httpApi.addRoutes({
  path: '/route',
  methods: [HttpMethod.GET],
  // integration: lambdaIntegration,
  integration: Object.defineProperty(lambdaIntegration, Symbol.for('constructs.Construct.node'), {
    value: (lambdaIntegration.bind as any)._actualNode,
  }),
});

Environment

• CDK CLI Version: 1.78.0 (build 2c74f4c)
• Module Version: 1.78.0
• Node.js Version: v14.4.0
• OS: macOs
• Language (Version): Typescript 4.0.5

Other information

Not sure if I am just to eager using the higher level experimental constructs, but I'd like to know if I am going about this the right way.

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