| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | * |
| 7 | * @flow |
| 8 | */ |
| 9 | |
| 10 | import * as React from 'react'; |
| 11 | import {Fragment} from 'react'; |
| 12 | |
| 13 | class ErrorBoundary extends React.Component { |
| 14 | state: {hasError: boolean} = {hasError: false}; |
| 15 | |
| 16 | static getDerivedStateFromError(error: any): {hasError: boolean} { |
| 17 | return {hasError: true}; |
| 18 | } |
| 19 | |
| 20 | render(): any { |
| 21 | const {hasError} = this.state; |
| 22 | if (hasError) { |
| 23 | return ( |
| 24 | <div |
| 25 | style={{ |
| 26 | color: 'red', |
| 27 | border: '1px solid red', |
| 28 | borderRadius: '0.25rem', |
| 29 | margin: '0.5rem', |
| 30 | padding: '0.5rem', |
| 31 | }}> |
| 32 | An error was thrown. |
| 33 | </div> |
| 34 | ); |
| 35 | } |
| 36 | |
| 37 | const {children} = this.props; |
| 38 | return ( |
| 39 | <div |
| 40 | style={{ |
| 41 | border: '1px solid gray', |
| 42 | borderRadius: '0.25rem', |
| 43 | margin: '0.5rem', |
| 44 | padding: '0.5rem', |
| 45 | }}> |
| 46 | {children} |
| 47 | </div> |
| 48 | ); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | // $FlowFixMe[missing-local-annot] |
| 53 | function Component({label}) { |
| 54 | return <div>{label}</div>; |
| 55 | } |
| 56 | |
| 57 | export default function ErrorBoundaries(): React.Node { |
| 58 | return ( |
| 59 | <Fragment> |
| 60 | <h1>Nested error boundaries demo</h1> |
| 61 | <ErrorBoundary> |
| 62 | <Component label="Outer component" /> |
| 63 | <ErrorBoundary> |
| 64 | <Component label="Inner component" /> |
| 65 | </ErrorBoundary> |
| 66 | </ErrorBoundary> |
| 67 | <ErrorBoundary> |
| 68 | <Component label="Neighbour component" /> |
| 69 | </ErrorBoundary> |
| 70 | </Fragment> |
| 71 | ); |
| 72 | } |