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Transcript
React Fiber Architectureͱ Ϩεϙϯεੑͷ্ JSConf.jp 2022.11.26 noyan
ຊͷςʔϚɿ ReactϨεϙϯεੑͷ্ʹ Ͳ͏Ξϓϩʔν͔ͨ͠
1. Introduction
ϨεϙϯεੑͱԿ͔ʁ • Ϩεϙϯεੑ(Responsiveness)Λɺ͜͜ͰҎԼͷΑ͏ʹ͏ɻ • ʮϢʔβʔʹΑΔΠϕϯτൃੜ͔ΒϑΟʔυόοΫ͕ؼͬͯ͘Δ· Ͱ͕Ͳͷ͘Β͍ૣ͍͔ʯ • ྫ: • <input>
ͷೖྗ͕ө͞ΕΔ·Ͱ1000msɹˠ ͍ • Πϕϯτͷछྨ͝ͱʹҟͳΔ
ɿJSͰͷ͠͞ JavaScriptͰϨεϙϯεੑͷߴ͍ίʔυΛ࣮ݱ͢Δͷ͕͍͠ʂ • ϩϯάλεΫɺϝΠϯεϨουʹΑΔೖྗͷεϜʔζͳॲཧɾ өΛ્͢Δ • վળ͢ΔͳΒɺ͍λεΫΛׂͯ͠தஅɾ࠶։͢ΔΈ͕ඞཁ
2. ReactͷԿ͕՝ͩͬͨͷ͔
Reactͷ৽͍ࠩ͠ݕॲཧ • ReactHooksͷϦϦʔεͱಉ࣌ظʹ෦࣮͕มߋ • ࠩݕॲཧΛ୲͢ΔύοέʔδͰɺϨϯμϦϯά͕ʮதஅɾ࠶։Մೳʯʹͳͬͨ • Not: ։ൃऀ͕ReactʹϨϯμϦϯάΛʮதஅͯ͠ɾ࠶։ͯ͠ʯͱࢦࣔΛૹΕΔ • ෦࣮ͷॲཧ͕தஅɾ࠶։ՄೳʹͳΔ
• ओͳϝϦοτʹɺϨεϙϯεੑͷ্͕͋Δ
Why, What, and How of React Fiber with Dan Abramov
and Andrew Clark “ओͳಈػɺReactͷͷ՝ͨͪΛղܾ͢Δ͜ͱͰ͢ɻͦ ͓ͯͦ͠Β͘Ұ൪େ͖ͳ՝ɺReact͕ݱࡏৗʹಉظతͰ͢ ͕ɺͦ͏Ͱ͋Δඞཁͳ͍͜ͱͰ͢ɻ” 8 ϝΠϯͷಈػ
۩ମతͳಉظతϨϯμϦϯάͷ • શͯͷλεΫΛొॱʹॲཧ͢ΔͨΊɺϨεϙϯεੑ͕ѱ͍ • Ϣʔβʔͷೖྗ(Typing)ͷөʹඦms͔͔Δ͜ͱ͕͋Δ • React͕ϝΠϯεϨουΛ༗͢ΔؒɺϒϥβΠϕϯτൃੜʹؾͮ ͔ͳ͍
2. Solution
ϨεϙϯεੑΛ্͛ΔͨΊʹඞཁͳઓུ • ϨϯμϦϯάʹ༏ઌॱҐΛ͚ͭͯཧ͢ΔΈ • ϒϥβΠϕϯτʹؾ͚ΔΑ͏ɺதஅɾ࠶։Ͱ͖ΔΈ
SchedulerͱReconciler React͜ͷ՝ղܾʹೋͭͷύοέʔδΛಋೖ͍ͯ͠Δ • Scheduler • ߋ৽ΩϡʔΛ༏ઌϕʔεͰཧɾ࣮ߦ • Fiber Reconciler •
தஅɾ࠶։ՄೳͳܗͰ”ԾDOM”ߏஙΛߦ͏
Scheduler • ঢ়ଶͷߋ৽ΩϡʔΛ༏ઌॱͰ࣮ߦ • 1. Πϕϯτ͝ͱʹకΛઃఆ • 2. క͕͍ۙॱʹΠϕϯτΛॲཧ •
༏ઌΩϡʔͰऔΓग़͠
Fiber Reconciler • ࡞ۀ୯ҐΛReactElement୯Ґʹׂ • ఆظతʹதஅ͠ɺϒϥβΠϕϯτ͕ͳ͍͔֬ೝ͢Δ • ۩ମతʹ4ms͝ͱʹܭࢉΛதஅ͍ͯ͠Δ
“Faster input events with Facebook’s fi rst browser API contributio”,
Nate Schloss, Andrew Comminos, 2022.4.22 • ϨεϙϯεੑͷͨΊʹύ ϑΥʔϚϯεΛগ٘͠ਜ਼ ʹ͍ͯ͠Δ • ࣮ղʹͳͬͨ • Ϣʔβʔϥϯυͷݶք ͰɺཧతͳղܾࡦͰ ͳ͍ ຊʹ͜ΕͰ͍͍ͷ͔ʁ
4. ཧతͳະདྷ
Ϩεϙϯεੑվળͷ͜Ε͔Β • scheduling.isInputPending, yield ͱ͍͏API͕ChromeͰ࣮͕ਐΜͰ͍Δ • isInputPending: ϝΠϯεϨουΛ໌͚ͣ͞ʹೖྗͪΛఆ • sheduling.yield:
awaitจͰܧଓ͕͔͚Δ • ͜ΕReactͷSchedulerͷସʹͳΔ͚ͩͰͳ͘ɺJSͰϩϯάλεΫதʹϨε ϙϯεੑ͕ࣦΘΕΔҰൠͷղܾࡦʹͳΔ • https://github.com/WICG/scheduling-apis/blob/main/explainers/yield-and- continuation.md#scheduleryield