TS2345 or TS2322 with generics when in multiple modules

[Delagen]

TypeScript Version:

1.8.10

Code

node_modules/module1/test.example.ts

import {
    Observable
} from "rxjs";

export class ExampleServiceInstance<T> {
    private dataObservable: Observable<T>;

    constructor(data: () => Observable<T>) {
        this.dataObservable = data();
    }

    get data(): Observable<T> {
        return this.dataObservable;
    }

    reset(): Observable<T> {
        return this.dataObservable;
    }
}

app/test.ts

import {
    Observable,
} from "rxjs";

import {ExampleServiceInstance} from "module1/test.example";

declare type ExampleData = Object[];

class ExampleService {
    private service: ExampleServiceInstance<ExampleData>;

    constructor() {
        this.service = new ExampleServiceInstance<ExampleData>(()=>Observable.of(<ExampleData> []));
    }

    get data(): Observable<ExampleData> {
        return this.service.data;
    }

    load(): Observable<ExampleData> {
        return this.service.reset();
    }
}

Expected behavior:
NO TS errors

Actual behavior:

test.ts
(13,58): error TS2345: Argument of type '() => Observable<Object[]>' is not assignable to parameter of type '() => Observable<Object[]>'.
Type 'Observable<Object[]>' is not assignable to type 'Observable<Object[]>'.
Property 'source' is protected but type 'Observable' is not a class derived from 'Observable'.
(17,10): error TS2322: Type 'Observable<Object[]>' is not assignable to type 'Observable<Object[]>'.
Property 'source' is protected but type 'Observable' is not a class derived from 'Observable'.
(21,10): error TS2322: Type 'Observable<Object[]>' is not assignable to type 'Observable<Object[]>'.

[mhegazy]

looks like the same issue in #6496.

[Delagen]

I think something not. No multiple declarations, no d.ts files at all

[Delagen]

Even rxjs module is resolved to the same in both files

[mhegazy]

I do not see how you would get this error if observable in both file resolve to the same declaration. can you share the otuput of tsc --traceResolution on this sample?

[Delagen]

When I upgraded to 1.9.0-dev which support this option, and compile manually through tsc error is gone

[Delagen]

Error when I using ts-loader in webpack with same options.

[mhegazy]

looks like an issue for https://github.com/TypeStrong/ts-loader then.