class组件用hook组件重写，componentWillMount()生命周期里的代码写在哪里？

[zwl1619]

class组件用hook组件重写，componentWillMount()生命周期里的代码写在哪里？ 比如下面示例：

import { createForm } from 'rc-form';

class Form extends React.Component {
  componentWillMount() {
    this.requiredDecorator = this.props.form.getFieldDecorator('required', {
      rules: [{required: true}],
    });
  }

  submit = () => {
    this.props.form.validateFields((error, value) => {
      console.log(error, value);
    });
  }

  render() {
    let errors;
    const { getFieldError } = this.props.form;
    return (
      <div>
        {this.requiredDecorator(
          <input
            onChange={
              // can still write your own onChange
            }
          />
        )}
        {(errors = getFieldError('required')) ? errors.join(',') : null}
        <button onClick={this.submit}>submit</button>
      </div>
    );
  }
}

export createForm()(Form);