error TS2769: No overload matches this call. ANGULAR-CodePudding

can't understand where is the problem on this typescript code.

error on line 5 ".subscribe((response: { Token: string }) => {"

login() {
this.httpClient
  .post('http://localhost:4000/signin', this.loginForm.value)
  .subscribe((response: { Token: string }) => {
    if (response.Token === undefined) {
      this.autenticazioneFallita = true;
    } else {
      this.router.navigate(['customer']);
    }
  });

}

CodePudding user response：

That's because of type only string (read comment)

login() {
this.httpClient
    .post('http://localhost:4000/signin', this.loginForm.value)
    .subscribe((response: { Token: string }) => {
        // Here you're declaring Token as string but then your checking if it's undefined and for typescript that would be always false
        if (response.Token === undefined) {
          this.autenticazioneFallita = true;
        } else {
          this.router.navigate(['customer']);
        }
    });

The solution is to declare Token as string or undefined:

.subscribe((response: { Token?: string }) => { /* ... */ })

By adding ? before the type typescript will know that that variable/attribute will be the type you provided OR undefined

CodePudding user response：

Maybe try with parameter to define type?

login() {
  this.httpClient
  .post<{Token?: string}>('http://localhost:4000/signin',                                             
       this.loginForm.value)
  .subscribe((response => {
    if (response.Token === undefined) {
      this.autenticazioneFallita = true;
    } else {
      this.router.navigate(['customer']);
    }
});