ClassPublicKeys

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题目

Implement the generic ClassPublicKeys<T> which returns all public keys of a class.

For example:

class A {
  public str: string;
  protected num: number;
  private bool: boolean;
  getNum() {
    return Math.random();
  }
}

type publicKeys = ClassPublicKeys<A>; // 'str' | 'getNum'

解答

type ClassPublicKeys<T, P = keyof T> = P extends keyof T ? P : never;