Typescript error in RxJS: Incorrect argument type used

I came across this code snippet from an example in rxjs:

 Observable.fromEvent(this.getNativeElement(this.right), 'click')
      .map(event => 10)
      .startWith({x: 400, y: 400})
      .scan((acc, curr) => Object.assign({}, acc, {x: acc.x + curr}))
      .subscribe(position => this.position = position);

However, I encountered a Typescript error:

[ts] Argument of type '{ x: number; y: number; }' is not assignable to parameter of type 'number | Scheduler'.
       Object literal may only specify known properties, and 'x' does not exist in type 'number | Scheduler'.

Any tips on resolving this issue?

Answer №1

If you want to bypass TypeScript's type checks, one option is to use type casting with the any keyword. For your specific scenario, you could do:

.map(event => <any>10)

Alternatively, you can also explore the mapTo() operator which allows you to convert all items in a stream to a constant value.

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