The type of 'username' cannot be determined without specifying the reference to '@angular/forms/forms' in the node modules

I'm encountering an issue with my application:

forgot-password.component.ts(44,7): error TS2742: The inferred type of 'username' cannot be named without a reference to '.../node_modules/@angular/forms/forms'. This is likely not portable. A type annotation is necessary.

import { Component, Output, EventEmitter } from '@angular/core';
import { Router } from '@angular/router';
import { FormGroup, FormBuilder, Validators } from '@angular/forms';
import { User } from '../../models';
import { ValidateUsername } from '../../validators/userid-validator';

@Component({
  selector: 'app-forgot-password',
  templateUrl: './forgot-password.component.html',
  styleUrls: ['./forgot-password.component.scss']
})
export class ForgotPasswordComponent {
  forgotPasswordForm: FormGroup;
  @Output() resetPassword: EventEmitter<any> = new EventEmitter<any>();
  @Output() onSubmit: EventEmitter<User> = new EventEmitter<User>();
  constructor(private formBuilder: FormBuilder, private router: Router) {
    this.forgotPasswordForm = this.formBuilder.group({
      username: ['', [Validators.required, ValidateUsername]]
    });
  }
  get username() { return this.forgotPasswordForm.get('username'); }
  passwordToken(event$) {
    this.onSubmit.emit(event$.value);
  }
}

The error message is pointing to the following line of code:

 get username() { return this.forgotPasswordForm.get('username'); }

Answer №1

delete

"attestation": true,

within the .json file

Answer №2

It is important to specify the return type of the property clearly.

get username(): AbstractControl { return this.forgotPasswordForm.get('username'); }

The forgotPasswordForm object is an instance of a FormGroup. When using the get() method, it returns an AbstractControl, which can have subclasses like:

  • FormArray
  • FormControl
  • FormGroup

Answer №3

When the message states:

This may not be portable without a type annotation.

It is important to review your tsconfig.json file to check for any issues with "baseUrl", "paths", and linked packages as well.

In this situation, TypeScript is pointing out that you have not provided a type for it in your ts config. You can either set it as "any", define an interface for it, or specify the type as needed, such as string in this scenario.

Answer №4

After troubleshooting, I managed to implement the following solutions:

#1 Adjusting the Reference Export

// The initial approach was not effective:
// export type { ObjectId as _ObjectId } from 'mongodb/node_modules/bson';

import type { ObjectId } from 'mongodb/node_modules/bson';
export type _ObjectId = ObjectId;
  • I imported the reference using type.
  • I opted for _ObjectId as the name to prevent IDE autocompletion interference.

#2 Resolving the Return Type Issue

This last resort is considered a suboptimal fix!

Set the return type to any, such as: function foo(): any

Answer №5

I encountered this issue while utilizing a filesystem syncer instead of npm/yarn link.

The problem was resolved by refraining from copying the node_modules directory from the dependency folder.

Answer №6

Incorporating a callback type is highly recommended, similar to the example below:

 get emailControl(): AbstractControl { 
   return this.loginForm.get('email'); 
 }

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