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[Angular エラー対策] Expected validator to return Promise or Observable

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エラーメモ

ERROR Error: Uncaught (in promise): Error: Expected validator to return Promise or Observable.
Error: Expected validator to return Promise or Observable.

対策

おそらく、下記のようにバリデーションを複数つけようとしてミスしている。

  form = this.fb.group({
    id: [''],
    name: ['', Validators.min(100), Validators.required],
  });

compose を使って Validator をまとめましょう。

  form = this.fb.group({
    id: [''],
    name: ['', Validators.compose([Validators.min(100), Validators.required])],
  });
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