Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Ready for Async Rendering
Search
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
Tweet
Share
More Decks by koba04
See All by koba04
Standing on the shoulders of giants
koba04
0
2.5k
React/Next によるアプリケーション開発のこれから
koba04
61
17k
フロントエンド刷新をプロジェクトとして進める際に気をつけていること
koba04
3
1.7k
How useEvent would change our applications
koba04
1
2.8k
kintoneフロントエンド刷新によるモノリスからの脱却とその先に目指す未来
koba04
3
14k
Make it Declarative with React
koba04
0
1.4k
Ready for React in 2019
koba04
2
1.6k
Algorithms in React
koba04
13
12k
Suspense and TimeSlicing
koba04
0
240
Other Decks in Programming
See All in Programming
日付と正規化
megmogmog1965
0
140
CSC307 Lecture 09
javiergs
PRO
1
500
Product Management LT会_クアンド新家
shinshin
0
210
実用的かつリーズナブルな 「Azure × Gemini × LINE」~キャラクターBot 実装ライブデモ~
tomodo_ysys
1
170
最古の関数型言語「Lisp」ことはじめ / lisp_in_kamiyama
uhooi
1
190
AWS CDKにおける「再利用性」を考える / aws-cdk-reusability
gotok365
6
1.3k
SDCon2024: Enabling DevOps and Team Topologies thru architecture: architecting for fast flow
cer
PRO
0
780
SRE チーム立ち上げ前に考えたこと・取り組んだこと / Considerations and Preparations Before Establishing an SRE Team
mackey0225
3
320
CSC307 Lecture 05
javiergs
PRO
0
210
Rustのweb開発を助ける 便利なツール紹介
yuki0418
1
190
AWSでゲームサーバーを運用! Amazon GameLiftのお話
iriikeita
0
200
入社1ヶ月でここまでやった!Findy Toolsインフラ支援の最適化
rvirus0817
6
1.4k
Featured
See All Featured
How to name files
jennybc
67
96k
Build your cross-platform service in a week with App Engine
jlugia
227
17k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
121
18k
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
325
21k
From Idea to $5000 a Month in 5 Months
shpigford
377
46k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
16
1.6k
Fontdeck: Realign not Redesign
paulrobertlloyd
79
5.1k
[RailsConf 2023] Rails as a piece of cake
palkan
35
4.4k
Imperfection Machines: The Place of Print at Facebook
scottboms
262
13k
Gamification - CAS2011
davidbonilla
78
4.9k
The Invisible Side of Design
smashingmag
294
50k
Designing on Purpose - Digital PM Summit 2013
jponch
113
6.6k
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