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Ready for Async Rendering
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koba04
April 19, 2018
Programming
6
1.5k
Ready for Async Rendering
Scramble! #1 Frontend
https://folio.connpass.com/event/82816/
koba04
April 19, 2018
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Transcript
3FBEZGPS"TZOD3FOEFSJOH 4DSBNCMF !LPCB
None
"HFOEB w 8IBUJT"TZOD3FOEFSJOH w -JGFDZDMF.FUIPET4USJDU.PEF w 5JNF4MJDJOH w 3FBDU4VTQFOTF
w "QQFOEJY v16.3 Changes
8IBUJT"TZOD3FOEFSJOH
w 3FBDU'JCFSJTBOVOJUPGXPSL 㲈3FBDU&MFNFOU w *UJTQPTTJCMFUPTUPQBOESFTVNFVQEBUFT 3FDBQ3FBDU'JCFS FiberA FiberB FiberD
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
4VTQFOEBOE3FTVNF FiberA FiberB FiberA FiberC Commit Low Priority Sync Priority
Commit FiberA FiberB FiberC Low Priority Reuse Interrupt Suspend
-JGFDZDMF.FUIPET
$IBOHFTGPSMJGFDZDMFNFUIPET http://blog.koba04.com/post/2018/04/04/react-v163-changes/
w $BMMFEBU3FOEFS1IBTF w 3FUVSOBQBSUJBMTUBUFCBTFEPOOFYU1SPQT w TUBUJDHFU%FSJWFE4UBUF'SPN1SPQT static getDerivedStateFromProps(nextProps, prevState) {
if (nextProps.category !== prevState.category) { return { data: null, category: null }; } return null; } componentDidUpdate() { if (this.state.category == null) { fetchData(this.props.category).then((data) => { this.setState({category: this.props.category, data}); }); }
w $BMMFEBU$PNNJU1IBTF w 3FUVSOBTOBQTIPU BOZ CFGPSFVQEBUFUIF)PTU w UIFTOBQTIPUJTQBTTFEUPDPNQPOFOU%JE6QEBUF HFU4OBQTIPU#FGPSF6QEBUF getSnapshotBeforeUpdate()
{ return { scrollHeight: document.body.scrollHeight, scrollTop: document.body.scrollTop, }; } componentDidUpdate(prevProps, prevState, snapshot) { const {body} = document; const {scrollTop, scrollHeight} = snapshot; body.scrollTop = scrollTop + (body.scrollHeight - scrollHeight); }
https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#examples
https://github.com/facebook/react/tree/master/packages/create-subscription
4USJDU.PEF
w *EFOUJGZJOHDPNQPOFOUTVOTBGFMJGFDZDMFT w 8BSOJOHBCPVUMFHBDZTUSJOHSFG"1*VTBHF w %FUFDUJOHVOFYQFDUFETJEFF⒎FDUT 4USJDU.PEF const {StrictMode} =
React; const App = () => ( <StrictMode> <Header /> <Main /> <Footer /> </StrictMode> );
/FX$BQBCJMJUJFT
https://reactjs.org/blog/2018/03/01/sneak-peek-beyond-react-16.html
5JNF4MJDJOH
w #MPDLJOH6*UISFBEJTBOBXGVMFYQFSJFODF w 5IFSFBSFNBOZQFPQMFXIPVTFMPXQPXFSEFWJDFT w 8IZOPUEFCPVODFPSUISPUUMF 5IFBOTXFSJTʜ w SFRVFTU*EMF$BMMCBDL 5JNF4MJDJOH
<AsyncMode> <FilterInput onChange={value => { ReactDOM.flushSync(() => this.setState({value})); this.setState({data: this.filterData(value)}); }} /> </AsyncMode>
https://koba04.github.io/react-fiber-resources/examples/ Async Update Sync Update
None
https://zeit.co/blog/domains-search-web
3FBDU4VTQFOTF
https://github.com/facebook/react/pull/12279
w 3FBDU4VTQFOTFJTBGFBUVSFUPIBOEMFBTZODVQEBUFT w )5513FRVFTU w %ZOBNJD-PBEJOH w )BOEMJOHBTZODISPOPVTVQEBUFTBSFTPIBSEʜ w 4UBSU-PBEJOH
"1*4VDDFTT &SSPSʜ w .BOZMPBEJOHTQJOOFST KBOLCZBGBTUSFTQPOTF 3FBDU4VTQFOTF
3FBDU4VTQFOTF "1*XJMMCFDIBOHFE import SimpleCacheProvider from ‘simple-cache-provider’; const cache = SimpleCacheProvider.createCache();
const userFetcher = id => SimpleCacheProvider.createResource(id => fetch(`/api/users/${id}`).then(res => res.json()); )(cache, id); const User = props => { const user = userFetcher.read(props.id); return <div>{user.name}</div>; }; const Fallback = props => ( <React.Timeout ms={props.timeout}> {didExpire => didExpire ? props.placeholder : props.children} </React.Timeout> ); <Fallback placeholder=“Loading…” timeout={200}> <User id={100} /> </Fallback>
3FBDU4VTQFOTF "1*XJMMCFDIBOHFE import SimpleCacheProvider from ‘simple-cache-provider’; const cache = SimpleCacheProvider.createCache();
const routeFetcher = Component => SimpleCacheProvider.createResource(Component => import(Component).then(module => module.default); )(cache, Component); const UserPage = () => { const Component = routeFetcher.read(‘./pages/User’); return <Component />; }; const Fallback = props => ( <React.Timeout ms={props.timeout}> {didExpire => didExpire ? props.placeholder : props.children} </React.Timeout> ); <Fallback placeholder=“Loading…” timeout={1000}> <UserPage /> </Fallback>
Empty Pending Resolved Rejected read or preload throw promise return
value from cache Cache load
w 3FBDU4VTQFOTFJTCBTFEPO&SSPS#PVOEBSJFT UIPVHI XIJDIUISPXT1SPNJTFJOTUFBEPG&SSPS )PXEPFT3FBDU4VTQFOTFXPSL User Fallback Timeout throw Promise!
(suspend) timeout render with fetched Data (resume)
https://github.com/facebook/react/pull/12201
w 5IF"1*JTOPUpOBM"1* NJHIUCFDIBOHFE w *IFBSESFOEFSGVODUJPONVTUOPUIBWFBOZTJEFF⒎FDUT w 3FBDU4VTQFOTFPO443SFOEFSFS w
1SFSFOEFSBOEQSFMPBEJOHXJUIIJEEFOQSPQT w "XFTPNF8IFODBO*VTF3FBDU4VTQFOTF w .BZCFJOʜ 3FBDU4VTQFOTF
"QQFOEJY
/FX$POUFYU"1* const LangContext = React.createContext(‘en’); const ThemeContext = React.createContext(‘dark’); const
App = () => ( <LangContext.Provider value=“en”> <ThemeContext.Provider value=“dark”> <Child> <LangContext.Consumer> {lang => ( <ThemeContext.Consumer> {theme => ( <button className={theme}> {getMessage(‘click’, lang)} </button> )} </ThemeContext.Consumer> )} </LangContext.Consumer> </Child> </ThemeContext.Provider> </LangContext.Provider> );
w )BSEUPUZQFDIFDLJOH w TIPVME$PNQPOFOU6QEBUFNJHIUCSFBLUIFVQEBUF 1SPCMFNTPGMFHBDZ$POUFYU"1* GrandChild Child Parent ThemeContext Brown
-> Orange shouldComponentUpdate return false;
w 0QUJNJ[FUIFVQEBUFTGPS$POUFYUWBMVF w 3FBDUVTFTCJUXJTFPQFSBUPSJUTJOUFSOBMT 0CTFSWFE#JUT VOTUBCMF⚠ const StoreContext = React.createContext(null,
(prev, next) => { let changedBits = 0; if (prev.foo !== next.foo) changedBits |= 0b01; if (prev.bar !== next.bar) changedBits |= 0b10; return changedBits; }); // changedBits & unstable_observedBits !== 0 <StoreContext.Consumer unstable_observedBits={0b01}> {({foo}) => <div>{foo}</div> </StoreContext.Consumer> <StoreContext.Consumer unstable_observedBits={0b10}> {({bar}) => <div>{bar}</div> </StoreContext.Consumer>
https://medium.com/@koba04/a-secret-parts-of-react-new-context-api-e9506a4578aa
w 3FEVYBOE/FX$POUFYUBSFEJ⒎FSFOUMBZFST w SFBDUSFEVYNJHIUCFDIBOHFEXJUI/FX$POUFYU"1* w IUUQTHJUIVCDPNSFBDUKTSFBDUSFEVYQVMM w 8IZBSFZPVVTJOH3FEVY /FX$POUFYUBOE3FEVY
5IBOLT TQFBLFSEFDLDPNLPCB