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複雑化したReact hookのデバッグとその対策
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ichien178
January 25, 2021
Technology
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複雑化したReact hookのデバッグとその対策
React Night #1 - connpass
https://misokatsu-web.connpass.com/event/196285/
ichien178
January 25, 2021
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Transcript
ෳࡶԽͨ͠React hookͷσόοάͱ ͦͷରࡦ @1coin178 2021/01/25 React Night #1 1
ࣗݾհ • Ұԁ ਅ࣏ @1coin178 • Ϡϑʔ໊ݹΦϑΟεͰΤϯδχΞ • ReactͬͯWebਤ࡞ͬͯ·͢ •
ϚΠϒʔϜ • ۙॴͷમ౬ɾன෩࿊@ࣗ 2
͍ͭͷࣄ https://map.yahoo.co.jp React + Redux + MapboxGLJS 3
ϦχϡʔΞϧ࣌ͷۤ • ϦϦʔεલʹΫϥείϯϙʔωϯτ͔Β ؔίϯϙʔωϯτ + Hookʹશॻ͖͑Λߦͬͨ • ॻ͖͑ͷཧ༝ɺcomponentDidUpdateͷ݅ذ͕ෳࡶԽͯ͠ ͍ͨΊɻHookͷuseEffectͰॲཧΛ͠ରࡦΛߦͬͨɻ •
಄Λ·ͤͨͷ͕ɺHookͷґଘྻͷཧɻಛʹuseEffect׳Ε ͕ඞཁͰɺແݶϧʔϓ͕ൃੜ͢ΔͳͲ͕ଟ͔ͬͨɻ • ࣌ɺσόοάํ๏ใΛݟ͚ͭΒΕͣۤ࿑ͨ͠ 4
ࠓ͢͜ͱ React Hookͷσόοάʹཱͬͨπʔϧͱରࡦํ๏Λհ ΞδΣϯμ 1. HookͷґଘྻΛ͓͞Β͍ 2. σόοάʹศརͳϥΠϒϥϦհ 3. ෳࡶԽͨ͠Hookͷରࡦ
5
HookͷґଘྻΛ͓͞Β͍ 6
HookͷґଘྻΛ͓͞Β͍ • ґଘྻ = Hookͷୈ2Ҿͷྻ • Hookͷൃಈʹ݅Λ͚ͭΔ͜ͱ͕Ͱ͖Δɻਖ਼͘͠ઃఆ͠ͳ͍ͱಈ͔ͳ͍ɾಈ͍ͯ͠·͏ const [count, setCount]
= useState(0) // mount࣌ͷΈ࣮ߦ useEffect(() => { console.log("Mount:" + count) },[]) // []݅ͳ͠); // mount + count͕ߋ৽͞Εͨ࣌ʹ࣮ߦ useEffect(() => { console.log("Update:" + count) },[count]) // count͕มԽͨ࣌͠); 7
HookͷґଘྻΛ͓͞Β͍ • ෦ͰsetNumberͨ͠ΒͲ͏ͳΔͰ͠ΐ͏? • => countߋ৽ˠuseEffect→countߋ৽ˠuseEffect→... => ແݶϧʔϓ͕ൃੜ const [count,
setCount] = useState(0) // mount࣌ͷΈ࣮ߦ useEffect(() => { console.log("Mount:" + count) },[]) // []݅ͳ͠); // mount + count͕ߋ৽͞Εͨ࣌ʹ࣮ߦ useEffect(() => { console.log("Update:" + count) // Ճ setCount(count+ 1) },[count]) // ґଘྻ); 8
ެࣜਪͷLintઃఆ https://ja.reactjs.org/docs/hooks-reference.html#useeffect • eslint-plugin-react-hooksͷreact-hooks/exhaustive-deps • ґଘྻ͕ਖ਼͘͠ͳ͍߹ɺमਖ਼ΛఏҊͯ͘͠ΕΔ • ͔͠͠ɺै͑ඞͣظ௨ΓʹͳΔΘ͚Ͱͳ͍ɻ ૉʹमਖ਼ͨ͠Βແݶϧʔϓೖ͢Δ͜ͱ... 9
࣌Hookཧղ͕ϒϨΠΫεϧʔͨ͠ࢿྉ • useEffectશΨΠυ — Overreacted1 “֮͑ͨ͜ͱΛશͯΕΔͷ͡Ό.” -— Yoda 1 https://iqkui.com/ja/a-complete-guide-to-useeffect/
10
σόοάʹศརͳϥΠϒϥϦհ 11
σόοάʹศརͳϥΠϒϥϦ • simbathesailor/use-what-changed2 • ίϯιʔϧʹHookมԽΛग़ྗ • custom Hook/babel plugin •
kentcdodds/stop-runaway-react-effects3 • ແݶϧʔϓൃੜ࣌ɺΞϓϦΛఀࢭ͠ίϯιʔϧʹܯࠂΛग़ྗ 3 https://github.com/kentcdodds/stop-runaway-react-effects 2 https://github.com/simbathesailor/use-what-changed 12
use-what-changed :͍ํͱग़ྗ consoleʹґଘྻͷมԽঢ়گ͕ग़ྗ • ରͷhook/ϑΝΠϧͷ໊લ • ґଘྻͷ໊લ • มԽ͔ͨ͠Ͳ͏͔ (
✅ , ) • มԽલޙͷ • ॳճ࣮ߦ or ߋ৽ • hook͝ͱʹϢχʔΫͳ৭ 13
use-what-changed:Πϯετʔϧํ๏ɹ npm i @simbathesailor/use-what-changed --save-dev npm i @simbathesailor/babel-plugin-use-what-changed --save-dev 14
use-what-changed:Πϯετʔϧํ๏ɹ • bable.config.json { "presets": [ "react-app" ], "plugins": [
[ "@simbathesailor/babel-plugin-use-what-changed", { "active": true } ] ] } 15
use-what-changed:͍ํͱग़ྗ ࢹ͍ͨ͠Hook্෦ʹuwc-debugͱίϝϯτ͢Δ͚ͩ uwc-debug-belowͩͱҎ߱ͷHookͯ͢ΛରʹͰ͖Δ const [a, setA] = useState("React Night"); const
[b, setB] = useState(1); // uwc-debug useEffect(() => { // do something }, [a, b]); <button onClick={() => { setB((b) => b + 1); }} > 16
ෳࡶԽͨ͠Hookͷରࡦ 17
ͳͥෳࡶԽ͢Δͷ͔ • ϩδοΫ͕ίϯϙʔωϯτʹدΔͱ ؔએݴࢹ͢ΔState͕૿Ճ͠ɺ͕ංେԽ • ݁ՌɺStateมԽʹ͏෭࡞༻(useEffect)͕૿͑ɺͦΕͧΕͷ ͷѲ͕ࠔʹͳΓɺґଘྻΛ૿ͯ͠͠·͏ɻ • ·ͨɺϏδωεϩδοΫΛͲ͜ʹ࣮͢Δͷ͕͍͍ͷ͔? ίϯϙʔωϯτ֎ͳͷ͔ํ͕ඞཁɻ
18
HookංେԽͷରࡦ 1. react-hooks/exhaustive-depsLintwarnͰઃఆ͠ɺFix/disable͢Δ͔దٓஅɻ 2. ίϯϙʔωϯτ͔ΒϩδοΫΛ • UIʹґଘ͠ͳ͍ͷɺίϯϙʔωϯτ֎ʹ • ൚༻త →
ผϞδϡʔϧ / ίϯϙʔωϯτґଘ → ίϯϙʔωϯτ 3. ReduxͳΒɺre-ducks4ͷߟ͑ʹج͖ͮɺoperations/selectorsʹ 4. custom HookΛੵۃతʹ࡞ Fat → slimʹͳͬͨίϯϙʔωϯτׂͰΛཧ͍ͯ͘͠ 4 https://github.com/alexnm/re-ducks 19
Fin. ! ฉ͍ͯ͘Εͯ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ 20
αϯϓϧίʔυ • https://github.com/1coin178/sample-use-what-changed-cra 21
ࢀߟࢿྉ • useEffectશΨΠυ — Overreacted1 • Debug your Reactjs Hooks
with ease !! | by Anil Chaudhary | Medium • ҆શʹ React Hooks Λ༻͢Δ - Qiita • ϑοΫʹؔ͢ΔΑ͋͘Δ࣭ – React 1 https://iqkui.com/ja/a-complete-guide-to-useeffect/ 22