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Reactivity Transform
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kazupon
August 17, 2022
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Reactivity Transform
kazupon
August 17, 2022
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Transcript
Reactivity Transform TechFeed Experts Night #2 2022.08.17 @kazupon
PLAID, inc. Vue.js Core Team Member Vue.js Japan User Group
Organizer Creator of Vue I18n & Intlify @kazu_pon kazupon kazupon
Vue Fes Japan Online 2022
ࠓ͢͜ͱ • Reactivity Transform ʹ͍ͭͯ • ·࣮ͩݧతػೳͳͷͰࠓޙมΘΔ Մೳੑ͕͋Δ͔
Reactivity Transform
Reactivity Transform ͱ? • ίϯύΠϥϚΫϩΛͬͯ Composition API ͷϦΞΫςΟϒ पΓͷΛղܾ͢ΔͨΊͷͷ •
Ґஔ͚ͮͱͯ͠ Composition API ͷ DX Λվળ͢ΔͨΊʹੜ·Εͨ
ఏڙ͞ΕΔίϯύΠϥϚΫϩ • `$` ͰϓϦϑΟοΫε͞ΕͨίϯύΠϥϚΫϩ܊ • $ref() • $computed() • $shallowRef()
• $customRef() • $toRef() • $() • $$()
ఏڙ͞ΕΔίϯύΠϥϚΫϩ • `$` ͰϓϦϑΟοΫε͞ΕͨίϯύΠϥϚΫϩ܊ • $ref() • $computed() • $shallowRef()
• $customRef() • $toRef() • $() • $$() Composition API ͷ ϦΞΫςΟϏςΟؔ࿈APIʹ ରԠ͢ΔϚΫϩ
ఏڙ͞ΕΔίϯύΠϥϚΫϩ • `$` ͰϓϦϑΟοΫε͞ΕͨίϯύΠϥϚΫϩ܊ • $ref() • $computed() • $shallowRef()
• $customRef() • $toRef() • $() • $$() Composition API ͷ ϦΞΫςΟϏςΟؔ࿈APIʹ ରԠ͢ΔϚΫϩ ϦΞΫςΟϏςΟपΓͷৼΔ͍ ΛऔΓѻ͏ϚΫϩ
ٕज़తʹͲ͏ͳͬͯΔʁ • Babel ΛͬͯϚΫϩͰॻ͔Εͨ VueͷίʔυΛ AST Λղੳͯ͠ɺ ಈ͘JSίʔυʹม͍ͯ͠Δ • `@vue/reactivity-transform`
ͱ͍͏ ύοέʔδͰॲཧ͞ΕΔ
ϦΞΫςΟϏςΟ पΓͷͱʁ
ref ͱ reactive ͷ औΓѻ͍͕͍͠
reactive ͱ ref ͷऔΓѻ͍͕͍͠ • reactive: • ΦϒδΣΫτσʔ λߏ •
number string ͳͲͷϓϦϛςΟ ϒͳॲཧͰ͖ ͳ͍
reactive ͱ ref ͷऔΓѻ͍͕͍͠ • ref: • ϓϦϛςΟϒͳ Λѻ͍Մೳ •
ΦϒδΣΫτՄ ೳ • `.value` ͰΞΫηε ͠ͳ͍ͱ͍͚ͳ͍
ΛׂೖͰऔ Γѻ͏ͷ͕͍͠
ΛׂೖͰऔΓѻ͏ͷ͕͍͠
ΛׂೖͰऔΓѻ͏ͷ͕͍͠
Props ͷσϑΥϧτ ఆٛํ๏
Props ͷσϑΥϧτఆٛํ๏
Reactivity Transform Λ͏ͱ…
ref ͱ reactive ͷ औΓѻ͍͕͍͠ ͱ͍͏ʹରͯ͠…
ref ܥΛ͍͍͑Α͏ʹͳΔ ίϯύΠϧલ ίϯύΠϧޙ e.g. `$ref` Λͬͨέʔε
ΛׂೖͰऔ Γѻ͏ͷ͕͍͠ ͱ͍͏ʹରͯ͠…
ׂೖ͕ؾܰʹ͑ΔΑ͏ʹͳΔ ίϯύΠϧલ ίϯύΠϧޙ
ׂೖ͕ؾܰʹ͑ΔΑ͏ʹͳΔ ίϯύΠϧલ ίϯύΠϧޙ
Props ͷσϑΥϧτ ఆٛํ๏ ͱ͍͏ʹରͯ͠…
Props ͷσϑΥϧτJSߏจͰఆٛՄೳ ίϯύΠϧલ ίϯύΠϧޙ
Reactivity Transform ͷҙ
ϦΞΫςΟϒͳมͷఆٛ
ϚΫϩͰఆٛͨ͠มΛؔʹ͢ͱ͖ ref ͷҾΛ࣋ͭؔʹɺ ϚΫϩͰఆٛͨ͠ม ͢ͱಈ࡞͠ͳ͍… (TSڥͷ߹ܕΤϥʔ) `$$()` Ͱϥοϓ(Τεέʔϓ)ͯ͋͛͠Ε ίϯύΠϧ࣌ʹ ref
ͷ··͞ΕΔ
ؔͰϚΫϩͰఆٛͨ͠มΛฦ͢ͱ͖
αϙʔτ͢Δ πʔϧ
ެࣜͰఏڙ͢Δπʔϧ • VS Code ֦ு • Volar • ESLint ϓϥάΠϯ
• eslint-plugin-vue (ϧʔϧఏڙ༧ఆ) • όϯυϥ͚ϓϥάΠϯɾϩʔμʔ • Vite: `@vitejs/plugin-vue@^2.0.0` • Webpack: `vue-loader@^17.0.0`
·ͱΊ
·ͱΊ • Reactivity Transform ϦΞΫςΟϏςΟप ΓͷΛղܾ͢ΔͨΊͷͷ • ίϯύΠϥϚΫϩΛ͏͜ͱͰΛղܾ͢ Δ͜ͱ͕Ͱ͖Δ •
෭࡞༻͋ΔͷͰ͏ͱ͖ҙ͕ඞཁ • αϙʔτ͢Δπʔϧ͕ఏڙ͞ΕΔͷͰ͍ͬ ͠ΐʹ͏ͱ DX ΛߴΊΒΕΔ
Thanks!