| 1 | import * as React from 'react'; |
| 2 | |
| 3 | const { |
| 4 | useState, |
| 5 | useEffect, |
| 6 | useCallback, |
| 7 | useContext, |
| 8 | createContext, |
| 9 | memo, |
| 10 | forwardRef, |
| 11 | } = React; |
| 12 | |
| 13 | // A custom hook, to exercise the hooks tree in react_get_component_by_uid. |
| 14 | function useToggle(initial) { |
| 15 | const [on, setOn] = useState(initial); |
| 16 | const toggle = useCallback(() => setOn(value => !value), []); |
| 17 | return [on, toggle]; |
| 18 | } |
| 19 | |
| 20 | // Function component with a single State hook + a button that triggers |
| 21 | // re-renders (useful for profiling). |
| 22 | function Counter() { |
| 23 | const [count, setCount] = useState(0); |
| 24 | return ( |
| 25 | <div className="row"> |
| 26 | <span>Count: {count}</span> |
| 27 | <button onClick={() => setCount(value => value + 1)}>+1</button> |
| 28 | </div> |
| 29 | ); |
| 30 | } |
| 31 | |
| 32 | // Uses the custom hook above, so its hooks tree nests a "Toggle" custom hook. |
| 33 | function Toggle() { |
| 34 | const [on, toggle] = useToggle(false); |
| 35 | return <button onClick={toggle}>{on ? 'ON' : 'OFF'}</button>; |
| 36 | } |
| 37 | |
| 38 | // State + Effect hook with a timer — re-renders every second, handy for |
| 39 | // react_start_profiling / react_get_trace_overview / react_get_commit_report. |
| 40 | function Clock() { |
| 41 | const [now, setNow] = useState(() => new Date().toLocaleTimeString()); |
| 42 | useEffect(() => { |
| 43 | const id = setInterval(() => setNow(new Date().toLocaleTimeString()), 1000); |
| 44 | return () => clearInterval(id); |
| 45 | }, []); |
| 46 | return <div className="row">Clock: {now}</div>; |
| 47 | } |
| 48 | |
| 49 | // Context, to exercise the "context" node type and useContext. |
| 50 | const ThemeContext = createContext('light'); |
| 51 | |
| 52 | function ThemeProvider({children}) { |
| 53 | return <ThemeContext.Provider value="dark">{children}</ThemeContext.Provider>; |
| 54 | } |
| 55 | |
| 56 | function ThemedPanel() { |
| 57 | const theme = useContext(ThemeContext); |
| 58 | return ( |
| 59 | <section className="panel" data-theme={theme}> |
| 60 | <h2>Panel (theme: {theme})</h2> |
| 61 | <Counter /> |
| 62 | <Toggle /> |
| 63 | <Clock /> |
| 64 | </section> |
| 65 | ); |
| 66 | } |
| 67 | |
| 68 | // List with keys, to exercise key reporting and find_components pagination. |
| 69 | function Todo({text}) { |
| 70 | return <li>{text}</li>; |
| 71 | } |
| 72 | |
| 73 | function TodoList() { |
| 74 | const items = [ |
| 75 | {id: 'learn', text: 'Learn the tools'}, |
| 76 | {id: 'test', text: 'Test the fixture'}, |
| 77 | {id: 'ship', text: 'Ship the package'}, |
| 78 | ]; |
| 79 | return ( |
| 80 | <ul className="todos"> |
| 81 | {items.map(item => ( |
| 82 | <Todo key={item.id} text={item.text} /> |
| 83 | ))} |
| 84 | </ul> |
| 85 | ); |
| 86 | } |
| 87 | |
| 88 | // memo and forwardRef, to exercise the "memo" and "forwardRef" node types. |
| 89 | const MemoBox = memo(function MemoBox({label}) { |
| 90 | return <div className="box">Memo: {label}</div>; |
| 91 | }); |
| 92 | |
| 93 | const FancyInput = forwardRef(function FancyInput({placeholder}, ref) { |
| 94 | return <input ref={ref} placeholder={placeholder} />; |
| 95 | }); |
| 96 | |
| 97 | function Header() { |
| 98 | return ( |
| 99 | <header> |
| 100 | <h1>react-devtools-cdt-mcp fixture</h1> |
| 101 | </header> |
| 102 | ); |
| 103 | } |
| 104 | |
| 105 | export default function App() { |
| 106 | return ( |
| 107 | <main className="app"> |
| 108 | <Header /> |
| 109 | <ThemeProvider> |
| 110 | <ThemedPanel /> |
| 111 | </ThemeProvider> |
| 112 | <TodoList /> |
| 113 | <MemoBox label="hello" /> |
| 114 | <FancyInput placeholder="type here" /> |
| 115 | </main> |
| 116 | ); |
| 117 | } |