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lazyLoad.jsx
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lazyLoad.jsx
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import PropTypes from 'prop-types';
import React from 'react';
import styled from '@emotion/styled';
import * as Sentry from '@sentry/react';
import {isWebpackChunkLoadingError} from 'app/utils';
import {t} from 'app/locale';
import LoadingError from 'app/components/loadingError';
import LoadingIndicator from 'app/components/loadingIndicator';
import retryableImport from 'app/utils/retryableImport';
class LazyLoad extends React.Component {
static propTypes = {
hideBusy: PropTypes.bool,
hideError: PropTypes.bool,
/**
* Function that returns a promise of a React.Component
*/
component: PropTypes.func,
/**
* Also accepts a route object from react-router that has a `componentPromise` property
*/
route: PropTypes.shape({
path: PropTypes.string,
componentPromise: PropTypes.func,
}),
};
constructor(...args) {
super(...args);
this.state = {
Component: null,
error: null,
};
}
componentDidMount() {
this.fetchComponent();
}
UNSAFE_componentWillReceiveProps(nextProps) {
// No need to refetch when component does not change
if (nextProps.component && nextProps.component === this.props.component) {
return;
}
// This is to handle the following case:
// <Route path="a/">
// <Route path="b/" component={LazyLoad} componentPromise={...} />
// <Route path="c/" component={LazyLoad} componentPromise={...} />
// </Route>
//
// `LazyLoad` will get not fully remount when we switch between `b` and `c`,
// instead will just re-render. Refetch if route paths are different
if (nextProps.route && nextProps.route === this.props.route) {
return;
}
// If `this.fetchComponent` is not in callback,
// then there's no guarantee that new Component will be rendered
this.setState(
{
Component: null,
},
this.fetchComponent
);
}
componentDidCatch(error) {
Sentry.captureException(error);
this.handleError(error);
}
getComponentGetter = () => this.props.component || this.props.route.componentPromise;
handleFetchError = error => {
Sentry.withScope(scope => {
if (isWebpackChunkLoadingError(error)) {
scope.setFingerprint(['webpack', 'error loading chunk']);
}
Sentry.captureException(error);
});
this.handleError(error);
};
handleError = error => {
// eslint-disable-next-line no-console
console.error(error);
this.setState({
error,
});
};
async fetchComponent() {
const getComponent = this.getComponentGetter();
try {
const Component = await retryableImport(getComponent);
this.setState({
Component: Component.default || Component,
});
} catch (err) {
this.handleFetchError(err);
}
}
fetchRetry = () => {
this.setState(
{
error: null,
},
() => this.fetchComponent()
);
};
render() {
const {Component, error} = this.state;
const {hideBusy, hideError, component: _component, ...otherProps} = this.props;
if (error && !hideError) {
return (
<LoadingErrorContainer>
<LoadingError
onRetry={this.fetchRetry}
message={t('There was an error loading a component.')}
/>
</LoadingErrorContainer>
);
}
if (!Component && !hideBusy) {
return (
<LoadingContainer>
<LoadingIndicator />
</LoadingContainer>
);
}
return <Component {...otherProps} />;
}
}
const LoadingContainer = styled('div')`
display: flex;
flex: 1;
align-items: center;
`;
const LoadingErrorContainer = styled('div')`
flex: 1;
`;
export default LazyLoad;