如果其中一个formArray具有值，如何创建自定义验证器？

import { AbstractControl, ValidatorFn } from '@angular/forms';

// 自定义验证器函数
export function atLeastOneValueValidator(): ValidatorFn {
  return (control: AbstractControl): { [key: string]: any } | null => {
    const formArray = control as FormArray;
    const hasValue = formArray.controls.some(control => control.value !== null && control.value !== '');

    return hasValue ? null : { 'atLeastOneValue': true };
  };
}

import { Component } from '@angular/core';
import { FormBuilder, FormGroup, FormArray, Validators } from '@angular/forms';
import { atLeastOneValueValidator } from './validators';

@Component({
  selector: 'app-my-form',
  template: `
    <form [formGroup]="myForm">
      <div formArrayName="myFormArray">
        <div *ngFor="let control of myFormArray.controls; let i = index">
          <input [formControlName]="i" placeholder="Value {{ i + 1 }}">
        </div>
      </div>
      <button [disabled]="!myForm.valid">Submit</button>
    </form>
  `
})
export class MyFormComponent {
  myForm: FormGroup;

  constructor(private formBuilder: FormBuilder) {
    this.myForm = this.formBuilder.group({
      myFormArray: this.formBuilder.array([], atLeastOneValueValidator())
    });
  }
}