What is the reason for the service not providing an encoded string as output?

A service has been created to encode passwords using the ts-md5 library in Angular:

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';

import { Md5 } from 'ts-md5/dist/md5';


@Injectable()
export class HashService {

  constructor() { }

  generate(str): Observable<string>{
    const h = Md5.hashStr(str);
    console.log(h, typeof h);
    return h;
  }

}

The component subscribes to the service like this:

this.hashService.generate(this.form.value.password).subscribe((hash) => {
  console.log(hash);
});

An error message is displayed in the console:

ERROR in src/app/shared/services/hash.service.ts(15,5): error TS2322: Type 'string | Int32Array' is not assignable to type 'Observable'. Type 'string' is not assignable to type 'Observable'

Attempts were made to specify a more common type:

generate(str): Observable<any>{

However, the problem persists

Answer №1

The Md5.hashStr() function in this code snippet does not return an Observable, but instead returns a string value. Therefore, there is no need to subscribe to it as if it were an observable. Simply returning the string value from the function is sufficient.</p>

<pre><code>// Updated service.ts file
generateHash(str): string {
    const hashedString = Md5.hashStr(str);
    return hashedString;
}

// Updated component.ts file
this.hashedPassword = this.hashService.generateHash(this.form.value.password);

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