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/*
* SonarQube
* Copyright (C) 2009-2017 SonarSource SA
* mailto:contact AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
import * as React from 'react';
interface Loader {
(): Promise<{ default: React.ComponentClass }>;
}
export function lazyLoad(loader: Loader) {
interface State {
Component?: React.ComponentClass;
}
// use `React.Component`, not `React.PureComponent` to always re-render
// and let the child component decide if it needs to change
return class LazyLoader extends React.Component<any, State> {
mounted: boolean;
state: State = {};
componentDidMount() {
this.mounted = true;
loader().then(i => this.receiveComponent(i.default), () => {});
}
componentWillUnmount() {
this.mounted = false;
}
receiveComponent = (Component: React.ComponentClass) => {
if (this.mounted) {
this.setState({ Component });
}
};
render() {
const { Component } = this.state;
if (!Component) {
return null;
}
return <Component {...this.props} />;
}
};
}
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