Suspense and TimeSlicing

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FiberE Commit all SideEffects Idle Time Idle Time Idle Time SideEffect SideEffect Host (DOM) FiberC Render Phase Commit Phase

w 3FOEFS1IBTFʜ"TZOD w $PNNJU1IBTFʜ4ZOD 3FDBQ3FBDU'JCFS FiberA FiberB FiberD FiberE Commit
all SideEffects Idle Time Idle Time Idle Time SideEffect SideEffect Host (DOM) FiberC Async Sync

FiberC 4VTQFOEBOE3FTVNF FiberA FiberB FiberA FiberC Commit Low Priority High
Priority Commit FiberA FiberB FiberC Low Priority Reuse Interrupt Suspend Resume

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w #MPDLJOH6*UISFBEJTBOBXGVMFYQFSJFODF w 5IFSFBSFNBOZQFPQMFXIPVTFMPXQPXFSEFWJDFT w %FCPVODJOHBOEUISPUUMJOHBSFGPSMPXQPXFSEFWJDFT 5JNF4MJDJOH <AsyncMode> <FilterInput onChange={value
=> { this.setState({value}); requestAnimationFrame(() => this.setState({data: this.filterData(value)}) ); }}

https://github.com/facebook/react/blob/master/packages/react-dom/src/events/SimpleEventPlugin.js

https://react-timeslicing-demo.netlify.com/ Low Priority High Priority

Schedule by React Scheduler

https://github.com/facebook/react/commit/1e3cd332a015e312149efa36eb81c7523411cc2d#diff- bbebc3357e1fb99ab13ad796e04b69a6

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https://reactjs.org/blog/2018/03/01/sneak-peek-beyond-react-16.html

w 4VTQFOTFJTBGFBUVSFUPIBOEMFBTZODVQEBUFT w )5513FRVFTU w %ZOBNJDJNQPSU w 1SPNJTFBTBQSJNJUJWF w )BOEMJOHBTZODISPOPVTVQEBUFTBSFTPIBSEʜ
w 4UBSU-PBEJOH "1*4VDDFTT 'BJMVSFʜ w .BOZMPBEJOHTQJOOFST KBOL6*CZGBTUSFTQPOTFT 4VTQFOTF

w /P w 4VQQPSUJOH1SPNJTF$PNQPOFOUEPFTO`UTPMWFQSPCMFNT w )PXEPZPVMJGUVQEFQFOEFODJFTPG1SPNJTF$PNQPOFOUT JOBODFTUPST *T4VTQFOTFTVQQPSUJOH1SPNJTF$PNQPOFOU // How
do you show loading message // until the user list has been fetched? {isLoading ? <Loading /> : <UserListPage />}

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w 4VTQFOTFJTCBTFEPO&SSPS#PVOEBSJFT UIPVHIXIJDI UISPXT1SPNJTFJOTUFBEPG&SSPS )PXEPFT4VTQFOTFXPSL User Fallback Timeout throw Promise!
(suspend) timeout render with fetched Data (resume)

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https://github.com/facebook/react/tree/master/packages/simple-cache-provider

Empty Pending Resolved Rejected read or preload throw promise return
value from cache Cache load

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4VTQFOTF "1*XJMMCFDIBOHFE import SimpleCacheProvider from ‘simple-cache-provider’; const cache = SimpleCacheProvider.createCache();
const userFetcher = id => SimpleCacheProvider.createResource(id => fetch(`/api/users/${id}`).then(res => res.json()); )(cache, id); const User = props => { const user = userFetcher.read(props.id); return <div>{user.name}</div>; }; const Placeholder = props => ( <React.Timeout ms={props.timeout}> {didExpire => didExpire ? props.fallback : props.children} </React.Timeout> ); <Placeholder fallback=“Loading…” timeout={200}> <User id={100} /> </Placeholder>

4VTQFOTF "1*XJMMCFDIBOHFE import SimpleCacheProvider from ‘simple-cache-provider’; const cache = SimpleCacheProvider.createCache();
const routeFetcher = Component => SimpleCacheProvider.createResource(Component => import(Component).then(module => module.default); )(cache, Component); const UserPage = () => { const Component = routeFetcher.read(‘./pages/User’); return <Component />; }; const Placeholder = props => ( <React.Timeout ms={props.timeout}> {didExpire => didExpire ? props.fallback : props.children} </React.Timeout> ); <Placeholder fallback=“Loading…” timeout={1000}> <UserPage /> </Placeholder>

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react@canary react-dom@canary simple-cache-provider

5IBOLZPV TQFBLFSEFDLDPNLPCB

Suspense and TimeSlicing

Suspense and TimeSlicing

koba04

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5JNF4MJDJOHBOE4VTQFOTF 3FBDU+45PLZP+VOF !LPCB

3FDBQ3FBDU'JCFS

w 3FBDU'JCFSJTBOVOJUPGXPSL 㲈3FBDU&MFNFOU w *UJTQPTTJCMFUPTUPQBOESFTVNFVQEBUFT 3FDBQ3FBDU'JCFS FiberA FiberB FiberD

w 3FOEFS1IBTFʜ"TZOD w $PNNJU1IBTFʜ4ZOD 3FDBQ3FBDU'JCFS FiberA FiberB FiberD FiberE Commit

FiberC 4VTQFOEBOE3FTVNF FiberA FiberB FiberA FiberC Commit Low Priority High

5JNF4MJDJOH

w #MPDLJOH6*UISFBEJTBOBXGVMFYQFSJFODF w 5IFSFBSFNBOZQFPQMFXIPVTFMPXQPXFSEFWJDFT w %FCPVODJOHBOEUISPUUMJOHBSFGPSMPXQPXFSEFWJDFT 5JNF4MJDJOH <AsyncMode> <FilterInput onChange={value

https://github.com/facebook/react/blob/master/packages/react-dom/src/events/SimpleEventPlugin.js

https://react-timeslicing-demo.netlify.com/ Low Priority High Priority

Schedule by React Scheduler

https://github.com/facebook/react/commit/1e3cd332a015e312149efa36eb81c7523411cc2d#diff- bbebc3357e1fb99ab13ad796e04b69a6

%FNP IUUQTSFBDUUJNFTMJDJOHEFNPOFUMJGZDPN IUUQTHJUIVCDPNLPCBSFBDUUJNFTMJDJOHEFNP

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https://reactjs.org/blog/2018/03/01/sneak-peek-beyond-react-16.html

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w /P w 4VQQPSUJOH1SPNJTF$PNQPOFOUEPFTO`UTPMWFQSPCMFNT w )PXEPZPVMJGUVQEFQFOEFODJFTPG1SPNJTF$PNQPOFOUT JOBODFTUPST *T4VTQFOTFTVQQPSUJOH1SPNJTF$PNQPOFOU // How

)PXEPFT4VTQFOTFXPSL

w 4VTQFOTFJTCBTFEPO&SSPS#PVOEBSJFT UIPVHIXIJDI UISPXT1SPNJTFJOTUFBEPG&SSPS )PXEPFT4VTQFOTFXPSL User Fallback Timeout throw Promise!

4JNQMF$BDIF1SPWJEFS

https://github.com/facebook/react/tree/master/packages/simple-cache-provider

Empty Pending Resolved Rejected read or preload throw promise return

)PXUPVTF4VTQFOTF

4VTQFOTF "1*XJMMCFDIBOHFE import SimpleCacheProvider from ‘simple-cache-provider’; const cache = SimpleCacheProvider.createCache();

4VTQFOTF "1*XJMMCFDIBOHFE import SimpleCacheProvider from ‘simple-cache-provider’; const cache = SimpleCacheProvider.createCache();

%FNP IUUQTSFBDUTVTQFOTFEFNPOFUMJGZDPN IUUQTHJUIVCDPNLPCBSFBDUTVTQFOTFEFNP

w 4VTQFOTFXJMMCFBWBJMBCMFJOWCZEFGBVMU w 5IFpOBM"1*NJHIUCFDIBOHFE w :PVDBOFYQFSJNFOUJUXJUIBDBOBSZWFSTJPO 4VTQFOTF $ npm install

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