React v16 and beyond React Fiber

Transcript

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    BSSBZ // จࣈྻ const DisplayName = ({user}) =>

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15. &SSPS
    #PVOEBSJFT class Child extends React.Component { componentDidMount() { throw new

    Error(‘Something went wrong!!’); } } class App extends React.Component { constructor(props) { super(props); this.state = { error: null }; } componentDidCatch(error, info) { // info.componentStack͸ComponentͷStackTraceจࣈྻ this.setState(() => ({error})); } render() { return this.state.error ? <p>Τϥʔ͕ൃੜ͠·ͨ͠</p> : <Child />; } }

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18. w 1PSUBMΛ࢖Θͳ͍ྫ 1PSUBM class App extends React.Component { componentDidUpdate() {

    const container = document.querySelector(‘.modal-container’); if (this.state.modal) { ReactDOM.render( <Modal type={this.state.modal} onClose={() => { this.setState( () => ({modal: null}), () => ReactDOM.unmountComponentAtNode(container) ); }} />, container ); } } }

19. w 1PSUBMΛ࢖ͬͨ৔߹ 1PSUBM class App extends React.Component { render() {

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    /> <List /> <Item /> <Item /> <Item /> ࠶ؼత & ಉظత ↓ UIΛϒϩοΫ͢Δ & ϑϨʔϜམͪ mount mount mount

39. طଘ࣮૷ͷ໰୊఺ Key Input API Response Ωʔೖྗ͕ ϒϩοΫ αʔόʔ͔Βͷ ϨεϙϯεΛॲཧ Key

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43. 3FBDU
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44. 3FBDU
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46. 4DIFEVMJOH

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48. SFRVFTU*EMF$BMMCBDL const work = (deadline) => { if (deadline.timeRemaining() >

    10) { // do some heavy tasks } else { requestIdleCallback(work); } }; requestIdleCallback(work); Fig. 1 Example of an inter-frame idle period (https://www.w3.org/TR/requestidlecallback/)

49. 'JCFSͷσʔλߏ଄

50. 'JCFSͷσʔλߏ଄ export type Fiber = {| tag: TypeOfWork, key: null

    | string, type: any, stateNode: any, return: Fiber | null, child: Fiber | null, sibling: Fiber | null, index: number, ref: null | (((handle: mixed) => void) & {_stringRef: ?string}), pendingProps: any, memoizedProps: any, updateQueue: UpdateQueue | null, memoizedState: any, internalContextTag: TypeOfInternalContext, effectTag: TypeOfSideEffect, nextEffect: Fiber | null, firstEffect: Fiber | null, lastEffect: Fiber | null, pendingWorkPriority: PriorityLevel, alternate: Fiber | null, _debugID?: DebugID, _debugSource?: Source | null, _debugOwner?: Fiber | ReactInstance | null, _debugIsCurrentlyTiming?: boolean, |};

51. -JOLFE-JTUߏ଄ let root = fiber; let node = fiber; while

    (true) { // Do something with node if (node.child) { node = node.child; continue; } if (node === root) { return; } while (!node.sibling) { if (!node.return || node.return === root) { return; } node = node.return; } node = node.sibling; } From: Fiber Principles: Contributing To Fiber #7942 https://github.com/facebook/react/issues/7942

52. Text = () => '...'; List = () => [

    <div>...</div>, <div>...</div>, ]; class App extends React.Component { render() { return ( <main> <h2>...</h2> <div> <Text /> <List /> </div> </main> ); } } ReactDOM.render(<App />, container) HostRoot <App /> <main /> <h2 /> <div /> <Text /> HostText List <div /> <div /> 1 2 3 4 5 6 8 9 10 7 Ͳ͔͜ΒͰ΋தஅʙ࠶։ Ͱ͖Δ

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56. ෭࡞༻͸·ͱΊͯҰ౓Ͱ൓ө͞ΕΔ FiberA FiberB FiberD FiberE Commit all SideEffects Idle Time

    Idle Time Idle Time Beginʙ Complete SideEffect SideEffect SideEffect Host (DOM) FiberC

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59. σϞ https://koba04.github.io/react-fiber-resources/examples/

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68. ඇಉظ3FOEFSJOHΛࢼ͢ // Low PriorityʹΑΔߋ৽ ReactDOM.unstable_deferredUpdates(() => { this.setState(updater); }); //

    ߋ৽͕Low Priorityͱͯ͠ѻΘΕΔComponent const AsyncComponent = React.unstable_AsyncComponent; <AsyncComponent> <App /> </AsyncComponent> // or class App extends AsyncComponent { onClick() { // Sync Priority ReactDOM.flushSync(() => this.setState(() => newState)); } }

69. ඇಉظ3FOEFSJOHΛࢼ͢ // Low PriorityʹΑΔߋ৽ ReactDOM.unstable_deferredUpdates(() => { this.setState(updater); }); //

    ߋ৽͕Low Priorityͱͯ͠ѻΘΕΔComponent const AsyncComponent = React.unstable_AsyncComponent; <AsyncComponent> <App /> </AsyncComponent> // or class App extends AsyncComponent { onClick() { // Sync Priority ReactDOM.flushSync(() => this.setState(() => newState)); } } v17Ҏ߱ͰͷAPI͸ݱ࣌఺Ͱ͸ະఆ

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