AWS CDK stack.regionalFact is not a function

Question

I am working with AWS CDK for typescript. I have my stack which consists of only one role

export class ModelServingStack extends BaseStack {
  constructor(scope: cdk.Construct, props: StackCommonProps, stackConfig: any) {
    const role: iam.IRole = this.createIamRole(`ModelEndpoint-Role`);
  }

  private createIamRole(roleBaseName: string): iam.IRole {
    return new iam.Role(this, "MyRole", {
      assumedBy: new iam.ServicePrincipal("sns.amazonaws.com"),
    });
  }
}

When I run the command to deploy cdk deploy I get the following error:

/workspaces/Zeus/node_modules/@aws-cdk/aws-iam/lib/principals.ts:540
    return stack.regionalFact(
                 ^
TypeError: Resolution error: Resolution error: Resolution error: Resolution error: stack.regionalFact is not a function.
Object creation stack:
  at stack traces disabled.
Object creation stack:
  at stack traces disabled..
    at ServicePrincipalToken.resolve (/workspaces/Zeus/node_modules/@aws-cdk/aws-iam/lib/principals.ts:540:18)
    at RememberingTokenResolver.resolveToken (/workspaces/Zeus/node_modules/@aws-cdk/core/lib/resolvable.ts:80:24)
    at RememberingTokenResolver.resolveToken (/workspaces/Zeus/node_modules/@aws-cdk/core/lib/private/resolve.ts:286:18)
    at resolve (/workspaces/Zeus/node_modules/@aws-cdk/core/lib/private/resolve.ts:212:51)
    at Object.resolve [as mapToken] (/workspaces/Zeus/node_modules/@aws-cdk/core/lib/private/resolve.ts:119:77)
    at TokenizedStringFragments.mapTokens (/workspaces/Zeus/node_modules/@aws-cdk/core/lib/string-fragments.ts:65:33)
    at RememberingTokenResolver.resolveString (/workspaces/Zeus/node_modules/@aws-cdk/core/lib/resolvable.ts:99:22)
    at RememberingTokenResolver.resolveString (/workspaces/Zeus/node_modules/@aws-cdk/core/lib/private/resolve.ts:290:23)
    at resolve (/workspaces/Zeus/node_modules/@aws-cdk/core/lib/private/resolve.ts:170:48)
    at Object.resolve (/workspaces/Zeus/node_modules/@aws-cdk/core/lib/private/resolve.ts:119:77)

Any idea? Thank you in advance.

Answer 1

One problem is that your constructor is missing the super(scope, id, props); call.

I haven't reasoned about whether or not this in your role factory will cause mischief. But in any case, it is idiomatic CDK to define your constructs in the Stack constructor, where this will certainly refer to your Stack instance.