The parameter type 'Object' cannot be assigned to the parameter type 'string'

Everything seems to be working fine in my application, but I am encountering the following error message:

The argument of type 'Object' is causing an issue and cannot be assigned to a parameter of type 'string'

Here is the code snippet where the error occurs:

public login(userData: any): Observable<any> {
    return this.http
      .post("/api/users/login", userData)
      .map(token => this.saveToken(token));
}


private saveToken(token: string): string {
    localStorage.setItem("car_auth", token);
    return token;
}

Answer №1

When looking at the error message, it indicates that you are assigning an Object to a variable of type string.

To resolve this issue, consider updating your code as shown below:

public loginUser(userData: any): Observable<string> {
    return this.http
      .post("/api/users/login", userData)
      .map((token: string) => this.saveAuthToken(token));
}

private saveAuthToken(token: string): string {
    localStorage.setItem("car_auth", token);
    return token;
}

Answer №2

When using a transcompiler, it is important to provide a hint about the return type of your http.post method so that it can verify that you are passing the correct argument to saveToken. The transcompiler needs to ensure that a string is being passed.

To address this issue, make sure to specify the explicit type as follows:

public login(userData: any) {
  return this.http
    .post("/api/users/login", userData)
    .map((token: string) => this.saveToken(token));
}

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