React製 SPA におけるパフォーマンスチューニング

by Kento TSUJI

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React੡ SPA ʹ͓͚Δ ύϑΥʔϚϯενϡʔχϯά Kento TSUJI (@maxmellon)  Recruit Technologies Co., Ltd.

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ࣗݾ঺հ • Github: @maxmellon • Twitter: @maxmellon_9039 • ϦΫϧʔτςΫϊϩδʔζ 18೥ ৽ଔೖࣾ  ࣾձਓྺ ൒೥ʂʂʂ (Vim ྺ 5೥) • ޷෺: ͏ͲΜ, Vim, pipeline-operator

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maxmellon/vim-jsx-pretty 157 ⭐

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ReactύϑΥνϡهࣄͰ ͸ͯͿ500 ߦ͖·ͨ͠ ✨

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ͬͦ͘͞Ͱ͕͢

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SPAʹԿΛٻΊ·͔͢ʁ

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ྫ͑͹

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͵Δͬͱ

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ͬ͘͘͞͞ͱ

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௚ײతʹ

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ͭ·Γ SPA ʹ ٻΊΒΕ͍ͯΔ΋ͷ͸ ѹ౗తͳϢʔβʔମݧ

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ѹ౗తͳϢʔβʔମݧΛ ࣮ݱ͢Δʹ͸Կ͕ඞཁ͔ʁ

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ύϑΥʔϚϯε

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Ϧονͳදݱྗ

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Մ༻ੑ ʢΦϑϥΠϯͰ࢖͑Δʣ

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ࠓճ͸ SPAʹ͓͚ΔύϑΥʔϚϯε ʹ͍͓ͭͯ࿩Λ͠·͢

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• ॳظϨϯμϦϯάͷ଎౓Λߴ଎Խ SPAʹ͓͚ΔύϑΥʔϚϯε

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SPAʹ͓͚ΔύϑΥʔϚϯε • ॳظϨϯμϦϯάͷ଎౓Λߴ଎Խ  ˠ ͜Ε͸ SEO ରࡦͷҙຯ΋͋Δ  ˠ ͜Ε͸৭ΜͳॴͰޠΒΕ͍ͯΔ 

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SPAʹ͓͚ΔύϑΥʔϚϯε • ॳظϨϯμϦϯάͷ଎౓Λߴ଎Խ  ˠ ͜Ε͸ SEO ରࡦͷҙຯ΋͋Δ  ˠ ͜Ε͸৭ΜͳॴͰޠΒΕ͍ͯΔ  ॏཁͰ͕͢ɺࠓ೔͸͜ͷ࿩͸͠·ͤΜ

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ࠓ೔࿩͢಺༰ • ࢀߟ: ϦονͳWebΞϓϦέʔγϣϯͷͨΊͷ7ͭͷݪଇ • https://yosuke-furukawa.hatenablog.com/entry/ 2014/11/14/141415 Ϣʔβʔͷೖྗʹਝ଎ʹରԠ͢Δ

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ϦΫϧʔτʹ͓͚ΔSPA • AirSHIFTͱ͍͏αʔϏε͕͋Δ • γϑτද͕௚ײతʹ࡞ΕΔ • React / Redux + BFF (redux-pluto) • Component ਺ ໿600 ݸͱ͍͏େن໛ͳSPA • ௚ײతʹγϑτΛ࡞੒͢ΔͨΊʹ  υϥοάΞϯυυϩοϓΛ࠾༻

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AirSHIFT ͱ͸

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• γϑτදͷ࡞੒Λ࢝Ίͱͨ͠ళ௕ۀ຿ͷ  αϙʔτ • ௚ײతʹૢ࡞Ͱ͖ΔΑ͏ʹ  υϥοάΞϯυυϩοϓͳͲͷૢ࡞͕͋Δ • γϑτදͷ੾Γସ͑ʹ  ͕͔͔͍࣌ؒͬͯΔ໰୊͕͋ͬͨ AirSHIFT ͱ͸

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BFF Client API Isomorphic Session Data Notiﬁcation  Server Redis FCM wrapper React/Redux Fetchr CSR SSR DB Push  Notiﬁcation WebSocket OAuth γϑτ  Ϙʔυ  ʢ࿈ܞΞϓϦʣ ΞʔΩςΫνϟ

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ࠓ೔͸AirSHIFT Ͱߦͬͨ ύϑΥʔϚϯεվળΛ ঺հ͠·͢

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͔͜͜Β͕ຊ୊Ͱ ࣮ࡍʹ͋ͬͨ࿩Ͱ͢

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͋Δ೔ "JS4)*'5ར༻͍ͯ͠ΔͷͰ͕͢ Ξοϓσʔτ͕͔͋ͬͯΒ ͘͢͝ॏ͍ΜͰ͢ΑͶʜ Ͳ͏ʹ͔ͯ͠  ૣ͘ͳΒͳ͍Ͱ͠ΐ͏͔ʁ ͳΔ΄Ͳʜ ࣗ෼ͷύιίϯ͕ѱ͍ͷͰ͠ΐ͏͔ʁ

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͸͍ ͋Γ͕ͱ͏͍͟͝·͢ʙ ճઢ͕ऑ͍ͷ͔ͳʜ "1*͕ॏ͍ͷ͔ʜ ͪΐͬͱ͓࢕͍ͯ͠ ௐࠪͯ͠΋ΑΖ͍͠Ͱ͠ΐ͏͔ʁ εςʔδϯάαʔόʔͷ ΋ͷ͸ͦΜͳʹ஗͘ͳ͍ͳʜ

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ௐࠪ͢Δͱ ϘτϧωοΫͷ΄ͱΜͲ͕4DSJQUJOH ˋ 4DSJQUJOH͸KBWBTDSJQUͷ࣮ߦʹ֘౰

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࠷ॳͷࢪࡦ • શ෦·ͱΊͯίϯϙʔωϯτͷ  ࠶ϨϯμϦϯάΛݮΒͦ͏ͱͨ͠ • εΫϦϓτͷ࣮ߦ͕஗͍͔ΒϘτϧωοΫ͸  redux·ΘΓʹܾ·͍ͬͯΔͩΖ͏ ͜͜ͰͳΜͱ͔͢Ε͹࠶ϨϯμϦϯάΛ  ݮΒͤΔͷͰ͸ʁ

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Redux ΞʔΩςΫνϟ View "DUJPOT .JEEMFXBSF Reducer 4UBUF Store DPOOFDU

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Redux ΞʔΩςΫνϟ View "DUJPOT .JEEMFXBSF Reducer 4UBUF Store DPOOFDU

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connect 3PPU $PNQPOFOU" DPOOFDU $PNQPOFOU"

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connect 3PPU $PNQPOFOU" DPOOFDU $PNQPOFOU" ͕͜͜ࢠʹ఻ୡ͍ͯ͠Δ͔Β  ࠶ϨϯμϦϯά͕ൃੜͯ͠ΔͷͰ͸

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connect 3PPU $PNQPOFOU" DPOOFDU $PNQPOFOU" ͕͜͜ࢠʹ఻ୡ͍ͯ͠Δ͔Β  ࠶ϨϯμϦϯά͕ൃੜͯ͠ΔͷͰ͸ 3FEVDFS͕  \  TUBUF   BOZ0CKFDU   ^  ͯ͠Δ

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connect 3PPU $PNQPOFOU" DPOOFDU $PNQPOFOU" 3FEVDFS͕  \  TUBUF   BOZ0CKFDU   ^  ͯ͠Δ ͜ͷઌ͔ΒมߋΛ఻ୡ ͠ͳ͍Α͏ʹ͢Ε͹͍͍ͷͰ͸ʂ ͕͜͜ࢠʹ఻ୡ͍ͯ͠Δ͔Β  ࠶ϨϯμϦϯά͕ൃੜͯ͠ΔͷͰ͸

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…͕ μϝ

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ਪଌ͢Δͳ ܭଌͤΑ

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ਪଌ͢Δͳ (ਅҼΛಛఆ͢Δ·Ͱ) ܭଌͤΑ

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ഊҼ • ௐ͕ࠪ؁͍ • ਅҼΛಛఆ͢Δ·Ͱͷܭଌ͕  Ͱ͖͍ͯͳ͔ͬͨ • Connect શ෦ࠩ͠ସ͑ͨͷ͕μϝͩͬͨ  O(N^2) ͳͷͰൺֱࣗମ͕ॏ͍

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ͲΜͳௐࠪΛ͢Δ͔ • Scripting ͷ಺༁ΛݟΔ • ؔ਺ͷίʔϧελοΫΛపఈతʹௐ΂Δ • React಺෦ͰԿ͕ى͍ͬͯ͜Δ͔Λௐ΂Δ ϘτϧωοΫͷਅҼΛݟ͚ͭΔ·Ͱ۷Γ͛͞Δ

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Dev Tools Λ పఈతʹ࢖͍౗͢

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Performance Proﬁler

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React Dev Tools (Highlight Update)

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React Dev Tools (Proﬁler)

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Network Timing

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User Timing

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What is the User Timing API ?

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User Timing API ͱ͸ • ύϑΥʔϚϯεΛܭଌ͢ΔͨΊͷ API • ͋Δ఺͔Β͋Δ఺·Ͱͷॲཧ͕࣌ؒݟΕΔ • Node ʹ΋͋Δ  > require(‘perf_hooks’).performance

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performance.mark(‘A’) doSomeThing() performance.mark(‘B’) preformance.measure(‘A-B’, ‘A’, ‘B’) ࢖͍ํ • doSomeThing ͷ࣮ߦ࣌ؒΛܭଌ͍ͨ͠৔߹ • ܭଌ͍ͨ͠લޙͰ mark() • measure(, , ) Ͱܭଌ

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performance.mark(‘A’) doSomeThing() performance.mark(‘B’) preformance.mesure(‘A-B’, ‘A’, ‘B’) ࢖͍ํ • doSomeThing ͷ࣮ߦ࣌ؒΛܭଌ͍ͨ͠৔߹ • ܭଌ͍ͨ͠લޙͰ mark() • measure(, , ) Ͱܭଌ ͜ͷίʔυΛ௥هͯ͠ %FW5PPMTͰ ύϑΥʔϚϯεΛܭଌ͢Δ

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React 16 ͔Β User Timing API͕ఏڙ • React 16 ͔ΒUser Timing API ͕ར༻͞Εͨ • ։ൃ؀ڥͰ͸ DevTools ͰݟΔ͚ͩͰ OK • React ͕ ΠΠΧϯδʹ  `performance.mark, measure` ͯ͘͠Ε͍ͯΔ

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ศརͰ͸͋Δ͕ “ਅҼ” Λಥ͖٧ΊΔʹ͸ গ͠՝୊͕͋ͬͨ

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՝୊ • Ϣʔβʔͷૢ࡞ ͱ Component ͷ  ϨϯμϦϯάͷؔ܎ੑ͕Θ͔Βͳ͍ • Կ͕͖͔͚ͬʹ  ࠶ϨϯμϦϯά͞Ε͍ͯΔ͔͕Θ͔Βͳ͍ Ͳͷૢ࡞͕ॏ͍ͷ͔͔ͬ͠Γ੾Γ෼͚͍ͨ

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redux-action-timing-middleware

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maxmellon/redux-action-timing-middleware

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Ͱ͖Δ͜ͱ • ΞΫγϣϯͱComponentͷϨϯμϦϯάͷ  ؔ܎͕ௐ΂ΕΔ • ྫ͑͹ LOCATION/CHANGE ͳͲͰ  શؔ͘܎ແ͍ίϯϙʔωϯτ͕Ξοϓσʔτ  ͞Ε͍ͯΔ͜ͱ͕Θ͔Δ

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redux-action-timing-middleware ͕஫ೖͨ͠  UserTiming ͸ ֆจࣈQSFpY

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γϑτදͷ σʔλͷऔಘ੒ޭ ͱ͍͏ΞΫγϣϯͰ  ൃੜͨ͠࠶ϨϯμϦϯά

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ϩʔσΟϯάΠϯδέʔλʔ࡟আʹΑͬͯ  ൃੜͨ͠࠶ϨϯμϦϯά

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• Redux ͷΞΫγϣϯ͸  Ϣʔβʔͷૢ࡞ͱඥ෇͍͍ͯΔ  ex. handleClick  ex. handleInput • Α͔ͬͨΒελʔ͍ͩ͘͞ʂʂʂʂ Ͳͷૢ࡞ͰԿ͕ϨϯμϦϯά͞Ε͔͕ͨΘ͔Δ ಋೖޙ

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վળͷΞϓϩʔν͸ େ͖̎ͭ͘

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ॲཧ࣌ؒΛ΁Β͢

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ॲཧ࣌ؒΛ΁Β͢

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খ͘͢͞Δ ॲཧ࣌ؒΛ΁Β͢

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ॲཧ࣌ؒΛݮΒ͢ • ؔ਺ͷॲཧ࣌ؒΛ୹͘͢Δ • ແବͳ࠶ܭࢉΛϝϞԽ͢Δ  ϥΠϒϥϦͩͱ reselect, memoize ͳͲ…. • ແବͳϧʔϓΛ஍ಓʹ௵͢

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ແବͳॲཧΛ͠ͳ͍

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ແବͳॲཧΛ͠ͳ͍

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ແବͳॲཧΛ͠ͳ͍

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• ݺͿඞཁͷͳ͍ؔ਺Λݺ͹ͳ͍Α͏ʹ͢Δ • React/Redux ʹ͓͍ͯ͸   reducer Ͱແବʹ৽͍͠stateΛฦ͞ͳ͍ • ઃܭϨϕϧͷݟ௚͕͠ඞཁͳέʔε͕ଟ͍ ແବͳॲཧΛ͠ͳ͍

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͜ΕΒΛ౿·͑ͯ ௐࠪ

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͍͔ͭ͘ؾʹͳΔ఺͕ ݟ͔͕ͭͬͨ ͦͷதͰ΋ҟ࣭ͳ΋ͷ͕͋ͬͨ

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ո͍͠Օॴ ΍ͨΒಉ͡ϒϩοΫ͕େྔʹ͋Δ…

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ո͍͠Օॴ ͜Ε΋

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͜Ε΋ ո͍͠Օॴ

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͜Ε΋ ո͍͠Օॴ

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໌Β͔ʹͳΔϘτϧωοΫ ͥʔΜͿ Reconciliation

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͜Ε΋ ո͍͠Օॴ

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ͦ΋ͦ΋ Reconciliationͬͯʁ

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Reconciliation ͱ͸ • Ծ૝DOMϨϕϧͰಉ͔͡Ͳ͏͔Λൺֱͯ͠  ࣮DOMʹcommit͢Δ͔Ͳ͏͔Λ൑ఆ • ͨͱ͑ SCU ͕ true ͩͱͯ͠΋  Ծ૝DOMϨϕϧͰ౳͍͠৔߹  commit ͞Εͳ͍

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Tree Reconciliation TFU4UBUF

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Tree Reconciliation 4$6USVF TFU4UBUF 4$6TIPVME$PNQPOFOU6QEBUF /P/FFE3FDPODJMJBUJPO /FFE3FDPODJMJBUJPO

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Tree Reconciliation 4$6USVF OFX1SPQTˠ OFX1SPQTˠ 4$6GBMTF 4$6USVF TFU4UBUF SFOEFS 4$6TIPVME$PNQPOFOU6QEBUF /P/FFE3FDPODJMJBUJPO /FFE3FDPODJMJBUJPO

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Tree Reconciliation 4$6USVF OFX1SPQTˠ OFX1SPQTˠ 4$6GBMTF 4$6USVF TFU4UBUF OFX1SPQTˠ OFX1SPQTˠ SFOEFS SFOEFS 4$6USVF 4$6GBMTF ྘ͷՕॴ͸  3FDPODJMJBUJPO͕  ൃੜ͢Δ /P/FFE3FDPODJMJBUJPO /FFE3FDPODJMJBUJPO 4$6TIPVME$PNQPOFOU6QEBUF

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Tree Reconciliation /P/FFE3FDPODJMJBUJPO /FFE3FDPODJMJBUJPO

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ͦ΋ͦ΋ shouldComponentUpdate ͱ͸ʁ

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React ʹ ͓͚Δ LifeCycle • ͦ΋ͦ΋ React ʹ͸ϥΠϑαΠΫϧ͕͋Δ • shouldComponentUpdate ͱ͍͏ͷ͸  ϥΠϑαΠΫϧͷ1ͭ • ੹຿͸ɺࠩ෼ϨϯμϦϯά͕ඞཁ͔Ͳ͏͔ͷ  ൑ఆΛߦ͏͜ͱ

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LifeCycle // version 16 DPOTUSVDUPS SFOEFS DPNQPOFOU%JE.PVOU DPNQPOFOU%JE6QEBUF DPNQPOFOU8JMM  6ONPVOU 6QEBUF3FBDU%0.BOESFGT Mount TIPVME$PNQPOFOU6QEBUF Update Unmount 3FOEFS  1IBTF $PNNJU  1IBTF HFU%SJWFE4UBUF'SPN1SPQT HFU4OBQTIPU#FGPSF6QEBUF

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࣮ࡍʹݟͯΈΔ

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Ͳ͏ݮΒ͔͢

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Tree Reconciliation 4$6USVF OFX1SPQTˠ OFX1SPQTˠ 4$6GBMTF 4$6USVF TFU4UBUF OFX1SPQTˠ OFX1SPQTˠ SFOEFS SFOEFS 4$6USVF 4$6GBMTF ͦ΋ͦ΋໦ߏ଄ খ͘͢͞Ε͹͍͍͡ΌΜ

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Reconciliation Λ΁Β͢ ̎ͭͷΞϓϩʔν • ໦ߏ଄Λখ͘͢͞Δ  㱺 ७ਮʹ໦ߏ଄Λ୳ࡧ͢Δྔ͕ݮΔ 

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Tree Reconciliation /P/FFE3FDPODJMJBUJPO /FFE3FDPODJMJBUJPO

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shouldComponentUpdate Ͱ Reconciliation ΛݮΒͤΔ

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Reconciliation Λ΁Β͢ ̎ͭͷΞϓϩʔν • ໦ߏ଄Λখ͘͢͞Δ  㱺 ७ਮʹ໦ߏ଄Λ୳ࡧ͢Δྔ͕ݮΔ • ෆཁͳReconciliation Λ͠ͳ͍  shouldComponentUpdate Λ ॻ͘  㱺 falseΛฦͨ͠ͱ͔͜Βࢠ͸ݟͳ͘ͳΔ

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۩ମతʹ ໦ߏ଄Λখ͘͢͞Δͱ͸ Ͳ͏͍͏͜ͱ͔

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ϒϥ΢βͷ  ΢Οϯυ΢αΠζ

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ඳը͞Ε͍ͯΔDOMͷαΠζ ϒϥ΢βͷ  ΢Οϯυ΢αΠζ

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ݟ͑ͯͳ͍෦෼ͷDOMΛඳը͢Δඞཁͳ͍!!! ͜ͷ෦෼͔͠  ݟ͑ͳ͍

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͜ΕΛ࣮ݱ͢Δͷ͕

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React-Virtualized

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React-Virtualizedͱ͸ • ڊେͳϦετ΍දΛ  ޮ཰Α͘ඳը͢ΔͨΊͷϥΠϒϥϦ • ແݶεΫϩʔϧͱ͔Ծ૝εΫϩʔϧ͕Ͱ͖Δ • ࣮ࡍʹ΍͍ͬͯΔ͜ͱ͸ඳըൣғ֎Unmount  εΫϩʔϧํ޲Λݟͯ௚લͰMount

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ͭ·Γ

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͜Ε͕

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͜͏ͳΔ

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લޙͦΕͧΕόοϑΝ͕ඞཁ ͳͥͳΒεΫϩʔϧ࣌ʹਅͬനʹͳΔ

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໦ߏ଄͸খ͘͞Ͱ͖ͨ

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ͨͩ

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·ͩ ෆཁͳ Reconciliation ͕͋Δ

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ෆཁͳ Reconciliation Λ͠ͳ͍

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ͦ΋ͦ΋ γϑτද෦෼ͷίʔυΛ ΈͯΈΔͱ

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3ͭͷͰ͔͍ίϯϙʔωϯτ͔Βߏ੒͞Ε͍ͯͨ

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Կ͕ѱ͍͔

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ͨͱ͑͹ ੺࿮ͷՕॴ͚ͩ ࠶ϨϯμϦϯά͍ͨ͠ͱ͢Δ

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shouldComponentUpdate ʹΑΔ൑ఆ͸  ίϯϙʔωϯτͷ୯ҐͰ͔͠Ͱ͖ͳ͍

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shouldComponentUpdate ʹΑΔ൑ఆ͸  ίϯϙʔωϯτͷ୯ҐͰ͔͠Ͱ͖ͳ͍ Ұ෦෼Λߋ৽͢ΔͨΊʹ  શ෦Λߋ৽͢Δ͔͠ແ͍

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໌Β͔ʹͳΔϘτϧωοΫ ࠩ෼ϨϯμϦϯάͷ ࢫຯ͕…

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Ͳ͏͢Δ͔

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ίϯϙʔωϯτΛখ۠͘͞੾Δ

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͜ͷΞϓϩʔνͷྑ͍ͱ͜Ζ

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͜ͷΞϓϩʔνͷڧΈ • ٕज़తʹ೉͍͠ཁૉ͕͘͢ͳ͍  ˠ ΊΜͲ͍͚ͩ͘͞ • shouldComponentUpdate ͸࠷ॳ͔Β  ॻ͔ͳͯ͘΋ྑ͍  → ॏ͘ͳΕ͹ॻ͚͹͍͍ • ίϯϙʔωϯτ͕খ͍͞ͱ props ͕গͳ͍  → SCU Λॻ͔ͳͯ͘΋ React.memo ͳͲ͕࢖͑Δ

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Fat ͳ Component ͸ ઈରμϝ

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ผΕ͍ͯΔ͚ͩͰ ྑ͍఺͕ͨ͘͞Μ͋Δ͠ ࢪࡦ΋ଧͪ΍͍͢

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Before / After

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Before After 4ഒ௿଎؀ڥͰ 374% վળɺ10ඵ΄ͲεϐʔυΞοϓ

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վળޙ γϑτදૣ͘ͳΓ·ͨ͠Ͷʂ ͋Γ͕ͱ͏͍͟͝·͢ʂ Αͬ͠Ό

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ͱ͸͍͑ • 3.6sec ͸଎͍ͱ͸ݴ͑ͳ͍ • ΍Γ࢒ͨ͠վળ΋͋Δ • Reducer Λ͖ͪΜͱ  ઃܭ͠ͳ͓ͤ͹  ແବͳߋ৽͕఻ୡ͞Εͳ͍

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·ͱΊ

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ਪଌ͢Δͳ ܭଌͤΑ

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ਪଌ͢ΔͳܭଌͤΑ • ͱΓ͋͑ͣͷܭଌ͸ݪҼͷ૚෼͚ʹա͗ͳ͍ • צͰࢼͯ͠΋͏·͍͔͘ͳ͍ • େࣄͳͷ͸ਅҼΛݟ͚ͭΔ·Ͱܭଌ͢Δ͜ͱ • Chrome Dev Tools / React Dev Tools  ͕ܭଌ͢Δ্Ͱศར

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ͦ΋ͦ΋ͳͥ ώΞϦϯά·Ͱ ൃ֮͠ͳ͔͔ͬͨ

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ސ٬ͷPC͸ CPUͷॲཧೳྗ͕௿͔ͬͨ ։ൃ؀ڥͰ͸໰୊ͳ͔ͬͨ

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ސ٬ͷ؀ڥͰ  ύϑΥʔϚϯε͸  ܭଌ͠ͳ͚Ε͹ͳΒͳ͍

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ސ٬ͱಉ౳ͷ؀ڥͰ ύϑΥʔϚϯεΛௐ΂Δ • Fast 3G ճઢͰಈ͔͢ • x4 εϩοτϧ؀ڥͰಈ͔͢

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̍࣍։ൃ࣌఺Ͱ͸ ௿଎ঢ়ଶͰͷ ύϑΥʔϚϯε֬ೝ΋ ͍ͯͨ͠

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ͦΕͰ΋ൃݟ͕஗Εͨͷ͸ ఆظతͳύϑΥʔϚϯεଌఆΛ ߦ͍ͬͯͳ͔͔ͬͨΒ

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ఆظతͳύϑΥʔϚϯεଌఆͷॏཁੑ • ύϑΥʔϚϯε͸ػೳ௥Ճͱͱ΋ʹ  ͲΜͲΜྼԽ͍ͯ͘͠ • ύϑΥʔϚϯεΛܧଓతɼఆظతʹݟ͍͖ͯ  ಈ޲Λৗʹܭଌ͓ͯ͘͜͠ͱ͕େࣄ ͜Ε͕ͦ͜श׳ԽͰ͋Γɺ ύϑΥʔϚϯεଌఆΛߦ͏จԽͰ͋Δ

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ࠓޙͷ՝୊

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ύϑΥʔϚϯε͸  վળͯ͠ऴΘΓͰ͸ͳ͍ ։ൃνʔϜʹश׳Խ  ͤ͞Δ͜ͱ͕େ੾

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ࠓޙͷ՝୊ • ͜ͷվળʹͱͲ·ΒͣνʔϜશମʹ  ύϑΥʔϚϯεΛ؍ଌ͢ΔจԽΛࠜ෇͚Δ • ແବͳॲཧΛߦΘͳ͍վળʹνϟϨϯδ  㱺 reducer ͷઃܭΛશ໘తʹݟ௚ͯ͠  ແବͳ఻ୡΛͳ͘͢ • ઌಡΈʹΑΔσʔλͷઌߦऔಘʹνϟϨϯδ

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;Ζ͘

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ָʹ shouldComponbentUpdate Λ ࣮૷͍ͨ͠

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ָʹSCUΛ ࣮૷͢ΔͨΊͷϥΠϒϥϦ • PureComponent • recompose/pure • React.memo • ͳͲ…

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ԿΛͯ͘͠ΕΔ͔

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ԿΛͯ͘͠ΕΔ͔ • جຊతʹ͢΂ͯ fbjs/shallowEqual ͯ͘͠ΕΔ • React.memo ͸ $$type Λॻ͖׵͑ͯ  ಺෦ͷ updater ͷϩδοΫΛࠩ͠ସ͑ͯΔ  㱺 SCU ʹ shallowEqual ͕ೖΔͱࢥͬͯྑ͍

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ͰɺͲΕ͕ྑ͍ͷʁ

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ܭଌͯ͠Έͨ

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No content

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ԣ࣠͸ prev === next ͷ֬཰ ॎ࣠͸ ࣌ؒ (ms)

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No content

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No content

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·ͱΊ • recompose/pure ͸ class Ͱ΋ ؔ਺ Ͱ΋  ࢖͑Δ • React.memo ͸ؔ਺༻ • PureComponent ͸ Ϋϥε༻ • React.memo ͸ ΦϓγϣϯͰνϡʔχϯάͰ͖Δ

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connect ୈ̐Ҿ਺

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connect() // version5 connect( [mapStateToProps], [mapDispatchToProps], [mergeProps], [options] ): (React.Component<*>) => Recat.Component<*> ࣮͸4ͭ໨ͷҾ਺͕͋Δ

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Options { pure = ture, areStatesEqual = (a, b) => a === b, areOwnPropsEqual = shallowEqual, areStatePropsEqual = shallowEqual, areMergedPropsEqual = shallowEqual, storeKey = ‘store’, } HoC ࣗମͷ࠶ϨϯμϦϯάͷ੍ޚ͕Ͱ͖Δ

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connect() // version5 Component Store connect areStateEqual(prev, next) next = mapStateToProps(prev, next) prev = next // memoized once Update Childe Component // return true   in shouldComponentUpdate of HoC

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connect() // version5 Component Store connect areStateEqual(prev, next) next = mapStateToProps(prev, next) prev = next // memoized once 7FSTJPO͸)P$ϕʔε Update Childe Component // return true   in shouldComponentUpdate of HoC

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connect() // version5 connect areStateEqual(prev, next) next = mapStateToProps(prev, next) prev = next // memoized once PQUJPOQVSF 4IBMMPX&RVBM 4USJDU&RVBM Update Childe Component // return true   in shouldComponentUpdate of HoC Store Component

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connect() // version5 connect areStateEqual(prev, next) next = mapStateToProps(prev, next) prev = next // memoized once ୈ̐Ҿ਺ͰΦʔόϥΠυͰ͖Δ QSFW4UBUF OFYU4UBUF CPPMFBO Update Childe Component // return true   in shouldComponentUpdate of HoC Store Component

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connect() // version5 connect areStateEqual(prev, next) next = mapStateToProps(prev, next) prev = next // memoized once Update Childe Component // return true   in shouldComponentUpdate of HoC Store Component લճͷ݁ՌΛอ͓࣋ͯ͘͠

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connect ·ͱΊ • HoCͰ࣮૷͞Ε͍ͯΔ • Connect ͷ areStateEqual ͕ false Λฦͤ͹  ࢠίϯϙʔωϯτͷ࠶ϨϯμϦϯάͳ͠ • ୈ4Ҿ਺ͰΦϓγϣϯΛ஫ೖՄೳ