Typescript typecheck not working on Http post response

Question

I have this Http Call:

getSomething(): Observable<MyTypedClass> {
return this.httpClient.post<MyTypedClass>(this._url, httpOptions)
  .pipe(
    catchError(this.formatErrors)
  );

}

Where MyTypedClass.ts look like this:

export class MyTypedClass {
  code: string;
  state: string;
}

JSON Response (Missmatch MyTypedClass):

{ "code": "INF00001", "test":true }

Since my JSON response does not match MyTypedClass for test purposes.

Question: Should I expect the HttpClient throws some missmatch or parse error and fires the error function on subscribers?

kshetline · Accepted Answer · 2018-03-04 19:40:25Z

2

TypeScript's type system in for compile-time only. It guides how you write your code, and is erased at runtime. You won't get any errors at runtime for JSON data not matching your class.

answered Mar 4, 2018 at 19:40

kshetline

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