114 lines
2.6 KiB
TypeScript
114 lines
2.6 KiB
TypeScript
import React from 'react';
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const emptyComponent = () => null;
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const noop = () => { };
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export interface BundleProps {
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fetchComponent: () => Promise<any>,
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loading: React.ComponentType,
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error: React.ComponentType<{ onRetry: (props?: BundleProps) => void }>,
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children: (mod: any) => React.ReactNode,
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renderDelay?: number,
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onFetch: () => void,
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onFetchSuccess: () => void,
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onFetchFail: (error: any) => void,
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}
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interface BundleState {
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mod: any,
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forceRender: boolean,
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}
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/** Fetches and renders an async component. */
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class Bundle extends React.PureComponent<BundleProps, BundleState> {
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timeout: NodeJS.Timeout | undefined;
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timestamp: Date | undefined;
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static defaultProps = {
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loading: emptyComponent,
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error: emptyComponent,
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renderDelay: 0,
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onFetch: noop,
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onFetchSuccess: noop,
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onFetchFail: noop,
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}
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static cache = new Map
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state = {
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mod: undefined,
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forceRender: false,
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}
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componentDidMount() {
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this.load(this.props);
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}
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UNSAFE_componentWillReceiveProps(nextProps: BundleProps) {
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if (nextProps.fetchComponent !== this.props.fetchComponent) {
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this.load(nextProps);
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}
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}
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componentWillUnmount() {
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if (this.timeout) {
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clearTimeout(this.timeout);
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}
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}
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load = (props?: BundleProps) => {
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const { fetchComponent, onFetch, onFetchSuccess, onFetchFail, renderDelay } = props || this.props;
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const cachedMod = Bundle.cache.get(fetchComponent);
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if (fetchComponent === undefined) {
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this.setState({ mod: null });
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return Promise.resolve();
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}
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onFetch();
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if (cachedMod) {
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this.setState({ mod: cachedMod.default });
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onFetchSuccess();
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return Promise.resolve();
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}
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this.setState({ mod: undefined });
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if (renderDelay !== 0) {
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this.timestamp = new Date();
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this.timeout = setTimeout(() => this.setState({ forceRender: true }), renderDelay);
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}
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return fetchComponent()
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.then((mod) => {
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Bundle.cache.set(fetchComponent, mod);
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this.setState({ mod: mod.default });
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onFetchSuccess();
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})
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.catch((error) => {
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this.setState({ mod: null });
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onFetchFail(error);
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});
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}
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render() {
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const { loading: Loading, error: Error, children, renderDelay } = this.props;
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const { mod, forceRender } = this.state;
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const elapsed = this.timestamp ? ((new Date()).getTime() - this.timestamp.getTime()) : renderDelay!;
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if (mod === undefined) {
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return (elapsed >= renderDelay! || forceRender) ? <Loading /> : null;
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}
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if (mod === null) {
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return <Error onRetry={this.load} />;
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}
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return children(mod);
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}
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}
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export default Bundle;
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