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JōtaiͰ͸͡ΊΔ ௒ܰྔ React.jsεςʔτ؅ཧ Super lightweight and primitive state management for React.js Gunma.web #44 ϑϦʔςʔϚ 2022.2.5 @ Online Tsubasa SEKIGUCHI

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TinyKitten Freelance frontend engineer I 💖 OSS & Cat🐈 Born in Gunma🐴 Live in Tokyo🗼

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Tsubasa SEKIGUCHI ౎಺Λڌ఺ͱ͢Δ܈അݝલڮࢢੜ·ΕͷϑϦʔϥϯεͷ
 ϑϩϯτΤϯυΤϯδχΞɻ ͖ͬͨΜͱݺ͹Ε͍ͯ·͢ɻ ͪͳΈʹࠓ೔26ࡀʹͳΓ·ͨ͠ɻ

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಺෦ςελʔืूத TrainLCD ೔ຊશࠃͷమಓ࿏ઢͰ࢖͑Δ ৽ײ֮ͷφϏήʔγϣϯΞϓϦͰ͢ɻ

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͸͡Ίʹ օ༷͸ʜ React.jsͷεςʔτ؅ཧɺͲ͏ͯ͠·͔͢ʁ ๻͸RecoilΛओʹ࢖͍ͬͯ·͢ɻ

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͸͡Ίʹ ࠓճͷεϥΠυͰ͸ Jōtaiͱ͍͏εςʔτ؅ཧϥΠϒϥϦ 
 ʹ͍ͭͯ࿩͠·͢ɻ

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JōtaiͬͯԿʁ ฏͨ͘ݴ͏ͱʜ ϓϦϛςΟϒ͔ͭॊೈͳ React.js༻ εςʔτ؅ཧϥΠϒϥϦ ൃԻ͸joe-tieͱ೔ຊޠͱಉ͡Ͱ͢ɻ

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ެࣜͷઆ໌͔ΒҾ༻͢Δͱʜ ϘτϜΞοϓɾΞϓϩʔνͷεςʔτϚωʔδϝϯτ Recoil͔ΒΠϯεύΠΞ͞ΕͨAtomicͳϞσϧ TypeScriptࢤ޲ͷඇৗʹϛχϚϧͳAPIΛ࣋ͭ JōtaiͬͯԿʁ

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JōtaiΛ࢖͏ͱԿ͕خ͍͔͠ Pros.

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όϯυϧαΠζ͸ʜ Mini fi ed 8.1kB Mini fi ed + Gzipped 3.2kB JōtaiΛ࢖͏ͱԿ͕خ͍͔͠ https://bundlephobia.com/package/jotai@1.5.3

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ҰํRecoil͸ʜ Mini fi ed 72.3kB Mini fi ed + Gzipped 21.1kB JōtaiΛ࢖͏ͱԿ͕خ͍͔͠ https://bundlephobia.com/package/recoil@0.5.2

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JōtaiΛ࢖͏ͱʜ Mini fi ed 64.2kB Mini fi ed + Gzipped 17.9kB ͷ࡟ݮ͕Ͱ͖·͢ 0KB 20KB 40KB 60KB 80KB Mini fi ed Gzipped Recoil Jōtai JōtaiΛ࢖͏ͱԿ͕خ͍͔͠

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΄͔ʹ΋͜ΜͳϢʔςΟϦςΟ(jotai/utils)͕͋Γ·͢ localStorageͰatom(state)ͷӬଓԽ SSRಋೖ࣌ͷϋΠυϨʔτ Redux෩ͷReducer/ActionTypes JōtaiͬͯԿʁ ެ͔ࣜΒҾ༻atomӬଓԽͷσϞ

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JōtaiͷΠϚΠνͳͱ͜Ζ Cons.

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Ͳ͜Ͱ΋atomΛ࡞Εͯ͠·͏ͷͰʜ ComponentͰatomΛ࡞Δͱ͖ɺ ௥ՃͰuseMemo/useRefͰ ϝϞԽΛ͢Δඞཁ͕͋Δ ެ͔ࣜΒҾ༻atom͕ಈతʹੜ੒͞Εͳ͍Α͏ʹ͢ΔσϞ JōtaiͷΠϚΠνͳͱ͜Ζ

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atom͸WeakMapʹ֨ೲ͞ΕΔͷͰʜ atom͕͢΂ͯͷίϯϙʔωϯτ͔Β ࢀর͞Εͳ͘ͳͬͨ৔߹ ΞϯϚ΢ϯτ࣌ͳͲ GCͰ஋͕ॳظԽ͞ΕΔ JōtaiͷΠϚΠνͳͱ͜Ζ https://twitter.com/dai_shi/status/1380885195549597696

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Recoil vs Jōtai ͦ΋ͦ΋ɺ Jōtai͸RecoilͱԿ͕ҧ͏ͷʁ

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։ൃऀ Recoil͸FacebookνʔϜʹΑͬͯ։ൃ͞Ε͍ͯͯɺ Jōtai͸Poimandres(ݩreact-spring) νʔϜͷҰ෦։ൃऀʹΑͬͯ։ൃ͞Ε͍ͯΔ Recoil vs Jōtai

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։ൃͷج४ Recoil͸େن໛։ൃ΍༷ʑͳཁٻʹ ରԠ͢ΔΑ͏ʹઃܭ͞Ε͍ͯΔ Jōtai͸ϓϦϛςΟϒͳAPIΛॏࢹ͢ΔઃܭΛ͍ͯ͠Δ Recoil vs Jōtai

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ٕज़తͳࠩҟ Recoil͸BUPNΦϒδΣΫτͷkeyʹରԠ͍ͯ͠Δ Jōtai͸atomͷstring keyʹରԠ͍ͯ͠Δ Recoil vs Jōtai TrainLCDͷҰ෦ίʔυൈਮ(Recoil)

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ٕज़తͳࠩҟ Recoil͸BUPNΦϒδΣΫτͷkeyʹରԠ͍ͯ͠Δ Jōtai͸atomͷstring keyʹରԠ͍ͯ͠Δ Recoil vs Jōtai TrainLCDͷҰ෦ίʔυൈਮ(Recoil)

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ݸਓతʹ͸ʜ େ͖ͳϓϩδΣΫτͷ৔߹͸΍ͬͺΓɺ Recoil͕҆৺͔ͳͱࢥ͍·͢ɻ খ͍͞ϓϩδΣΫτ΍ɺContext APIͰ஍ࠈʹͳ͍ͬͯΔ ϓϩδΣΫτʹ͸ɺ JōtaiΛಋೖͯ͠΋͍͍͔ͳͱࢥ͍·͢ɻ ·ͱΊ

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खલຯḩͰ͕͢ʜ JōtaiΛ࢖ͬͨϓϩδΣΫτΛ࡞Γ·ͨ͠ɻ Wordle෩ͷࠃ಺ͷӺ໊౰ͯήʔϜͰ͢ɻ ͥͻ͓ࢼ͍ͩ͘͠͞ɻ JōtaiΛ࢖ͬͨϓϩδΣΫτ IUUQTTUBUMFUJOZLJUUFONF

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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ Thank you for listening! Gunma.web #44 ϑϦʔςʔϚ 2022.2.5 @ Online Tsubasa SEKIGUCHI