Getting React flow error: module is not a polymorphic type. How to extend a class?

Question

我正在尝试扩展我现有的布局以基本上覆盖方法 renderHeader() 但流程不喜欢它：

module ./Layout [1] is not a polymorphic type.

我该如何解决这个问题？

这里是 class 我正在尝试扩展（它不是抽象的）：
Layout.js

//@flow
import * as React from 'react';
import Header from '../header/Header';
import '../../css/settings/utilities.css';

export type LayoutProps = {
    children: React.Node,
};

class Layout extends React.PureComponent<LayoutProps> {
    renderHeader() {
        return <Header />;
    }
    render() {
        return (
            <React.Fragment>
                <h1 className="u-hd">My Wee Loyalty Prime</h1>
                {this.renderHeader()}
                <main className="main">{this.props.children}</main>
            </React.Fragment>
        );
    }
}

export default Layout;

这是我的 class 应该扩展： LayoutRegistration.js

//@flow
import * as React from 'react';
import Header from '../header/Header';
import * as Layout from './Layout';
import '../../css/settings/utilities.css';

export default class LayoutRegistration extends Layout {
    renderHeader() {
        return <Header showSubnav={false} />;
    }
}

Answer 1

试试这个：

//@flow
import * as React from 'react';
import Header from '../header/Header';
import '../../css/settings/utilities.css';
//Change te type to interface. Since type is not assignable to interface
type LayoutProps<T> {
    children: React.Node
};

class Layout<T> extends React.PureComponent<*, LayoutProps<T>, *> {
    renderHeader() {
        return <Header />;
    }
    render() {
        return (
            <React.Fragment>
                <h1 className="u-hd">My Wee Loyalty Prime</h1>
                {this.renderHeader()}
                <main className="main">{this.props.children}</main>
            </React.Fragment>
        );
    }
}

Answer 2

问题是

import * as Layout from './Layout';

导致 Layout 导入是模块对象，而它应该是 class。

由于 Layout 组件是默认导出的，因此应该是：

import Layout from './Layout';

Getting React flow error: module is not a polymorphic type. How to extend a class?

Getting React flow error: module is not a polymorphic type. How to extend a class?

javascript

reactjs

flowtype

javascript-inheritance