まちにまった Vue.js 3

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·ͪʹ·ͬͨ Vue.js 3 Vue.js v-tokyo meetup #11 2020.08.25 @kazupon

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ࣗݾ঺հ

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PLAID, inc. Vue.js Core Team Member Vue.js Japan User Group Organizer Creator of Vue I18n & Intlify WebAssembly Love ❤ @kazu_pon kazupon kazupon

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͸͡Ίʹ

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2020೥7݄18೔

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Vue.js 3.0 RC ϦϦʔεʂ https://github.com/vuejs/rfcs/issues/189 ͜ͷ issue Ͱ Evan ࢯ͕ࠓޙʹ͍ͭͯද໌

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߹ΘͤͯެࣜυΩϡϝϯτ΋ެ։ (β) https://v3.vuejs.org/

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ެࣜϓϥάΠϯɾπʔϧ΄΅४උ͕੔͍ͭͭ͋Δ • vue-router v4.0.0-beta6 • vuex v4.0.0-beta4 • vue-cli v4.5.0 (vue 3 preset) • vue-devtools v6.0.0-beta.1 • eslint-plugin-vue v7.0.0-beta.2 • @vue/test-utils v2.0.0-beta.2 • vue-class-component v8.0.0-alpha.6 • vue-loader v16.0.0-beta.5 • rollup-plugin-vue v6.0.0-beta.8

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σγδϣϯπϦʔͷެ։ https://github.com/vuejs/rfcs/issues/183

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͍Α͍Α ϦϦʔεؒۙʂ

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ࠓ೔࿩͢͜ͱ

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ͦͷલʹ

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2020೥2݄1೔

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No content

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Vue 3 ʹ͍ͭͯ࿩ͨ͠

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εϥΠυ͸ͪ͜Β https://speakerdeck.com/kazupon/mamonakuyatutekuru-vue-dot-js-3

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ͱ͍͏͍Θ͚Ͱ

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ࠓ೔࿩͢͜ͱ • 2݄ͷൃද͔Βͷ Diff (ࠩ෼) • Vue 3 ؔ࿈पΓͷΞοϓσʔτ৘ใ • SFC • Vite • @vuedx • ͦͷଞ

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SFC

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Evan ࢯ͕ SFC վળ ͷ PR Λ౤Լ https://twitter.com/youyuxi/status/1277695108268339208

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౤Լͨ͠ RFC ͸ 3ͭ • 1. ίϯϙʔωϯτͷΠϯϙʔτ౶ҥߏจ • 2. Composition API ͷ DX վળ • 3. CSS ม਺ΠϯδΣΫγϣϯ https://github.com/vuejs/rfcs/pull/182

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ίϯϙʔωϯτ ͷ Πϯϙʔτ౶ҥߏจ

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• SFC ʹϒϩοΫΛಋೖ

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ͰԿ͕ྑ͘ͳΔͷ͔ʁ

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͜͏͍͏ίʔυΛॻ͘ඞཁ͕ͳ͘ͳΔʂ • Ұൠతͳίϯϙʔωϯτ ैདྷ RFC ίϯϙʔωϯτΛ࢖͏ͨΊʹ ͍͍ͪͪ ϒϩοΫ಺Ͱ import ͢Δඞཁ͕ͳ͘ͳΔ

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͜͏͍͏ίʔυΛॻ͘ඞཁ͕ͳ͘ͳΔʂ • ඇಉظͳίϯϙʔωϯτ ඇಉظίϯϙʔωϯτΛϩʔυ͢ΔͨΊʹ dynamic import Ͱ components Φϓγϣϯʹ ࢦఆ͢Δඞཁ͕ͳ͘ͳΔ ैདྷ RFC

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ίϯϙʔωϯτΛผ໊ʹͰ͖Δ • as Λ࢖͏͜ͱͰผ໊ʹͰ͖Δ ES modules ͷ import ߏจͷ as ͱಉ͜͡ͱ͕Ͱ͖Δ

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Composition API ͷ DX վળ

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• <script> ʹ setup ͕௥Ճ

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Ͱ Ͳ͏DX͕ྑ͘ͳΔʁ

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ΑΓ؆ܿʹ࣮૷Ͱ͖Δʂ setup ؔ਺಺ͰϩδοΫΛ࣮૷ͯ͠ɺϨϯμϦϯά ͢ΔͨΊʹίϯςΩετฦ͢ඞཁ͕ͳ͘ͳΔʂ ैདྷ RFC

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࢖͍ํ

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ίϯςΩετͰϨϯμϦϯά͢ΔͨΊʹ͸ʁ • export ͢Δ ES Modules ͷ export ߏจΛ࢖͏͚ͩ

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setupؔ਺ͷҾ਺͸Ͳ͏࢖͏ʁ • setup ͷଐੑ஋ʹࢦఆ͢Δ ैདྷ RFC

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ίϯϙʔωϯτΦϓγϣϯ͸ʁ ैདྷ RFC props ͳͲͷ ίϯϙʔωϯτΦϓγϣϯΛ ࢖͏৔߹͸ export default ͢Δඞཁ͕͋Δ

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TypeScript ͸ʁ • declare Λ࢖ͬͯܕఆٛ declare Ͱ props Λ͢Δͱɺ SFCίϯύΠϥ͕ props ࣮ࡍͷఆٛίʔυͱ TS ͷܕਪ࿦͞ΕΔΑ͏ʹίϯύΠϧ͢Δ

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ͱ <script setup> ΛҰॹʹ࢖͑Δ ༻్: - άϩʔόϧͳॲཧΛҰ౓͚ͩ ࣮ߦ͍ͨ͠৔߹ - SFC Ͱ named export ͳ΋ͷΛ ఏڙ͍ͨ͠৔߹

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CSS ม਺ ΠϯδΣΫγϣϯ

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• style ϒϩοΫʹ vars ͕௥Ճ

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Ͱ Ͳ͏ྑ͘ͳΔʁ

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script ଆ͔Β஋Λ౉ͤΔʂ vars ʹఆٛͨ͠ม਺Λ Webඪ४ͷCSSม਺ͷཁྖͰ ελΠϧ஋ͱͯ͠ ׂΓ౰ͯΔ͜ͱ͕Ͱ͖Δʂ ͭ·ΓɺಈతͳελΠϧΛ੍ޚͰ͖Δʂ όΠϯσΟϯάʂ

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ͱ͍ͬ͠ΐʹར༻Մೳ vars Λ scoped ͱ ͍ͬ͠ΐʹར༻͍ͨ͠৔߹͸ɺ ಺෦ͷCSSม਺͸ϩʔΧϧͱݟͳ͢ ͭ·Γɺ͜ͷέʔεͰ͸ --color ͕Өڹ͢Δͷ͸ ͜ͷίϯϙʔωϯτʹͷΈ

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άϩʔόϧͳCSSม਺ͷར༻͸ʁ --global ϓϦϑΟοΫεΛ࢖ͬͯ CSSม਺Λར༻͢Δ

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͜ΕΒRFCͷ࠾୒ʹ͍ͭͯ • , <style vars> ʹͭ ͍ͯ͸ RC ʹ࣮૷ࡁΈ • <script setup> ͸೉ͳ͘࢖͑Δ • <style vars> ͸CSS ม਺͕࢖͑ΔϞ μϯͳϒϥ΢βͰར༻Ͱ͖Δ

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͜ΕΒRFCͷ࠾୒ʹ͍ͭͯ • ʹ͍ͭͯ͸·ͩະ࣮૷ • SFC ʹ৽ͨͳϒϩοΫ΍ॻ͖ํ͕ՃΘΔ ͷͰɺෳࡶੑͱֶशίετ͕૿͢ΜͰ ͸ʁ • Vetur ͱ͍ͬͨςϯϓϨʔτղੳΛ͢Δ πʔϧ΁Өڹ͕େ͖͗͢ΔͷͰ͸ʁ

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ͱ͍͏Θ͚ͰɺVue 3.0 Ͱ͸… • ·ͩ RFC Ͱ͍Ζ͍Ζͱٞ࿦ɺϑΟʔυόο Ϋ͕͋ΔͨΊ SFC ͷਖ਼ࣜػೳͰ͸ͳ͍ • ͜ͷ SFC վળ ͸ Experimental (࣮ݧత) ͳ ػೳͱͯ͠ఏڙ͞ΕΔ • ໰୊ͳ͚Ε͹ɺv3.1 ? Ͱ࠾୒͞ΕΔ༧ఆ

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Vite

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Evan ࢯ͕৽͍͠Ϗϧυπʔϧެ։ • ಡΈํ: `/vit/` https://github.com/vitejs/vite

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6݄ʹViteʹ͍ͭͯ࿩ͨ͠ https://speakerdeck.com/kazupon/native-esm-powered-web-dev-build-tool ϓϥάΠϯ࡞Γ͍ͨਓ ಺෦࣮૷ʹ͍ͭͯ஌Γ͍ͨํ͸ͥͻʂ

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Vite ͷಛ௃ • ES Modules ϕʔεͷ։ൃαʔόΛඋ͑ͨϞμϯͳ Ϗϧυπʔϧ • dev server ͸ߴ଎ • ىಈ࣌ʹ͢΂ͯόϯυϧ͠ͳ͍ • ߴ଎ͳ ESbuild ʹΑΔ on the ﬂy ίϯύΠϧ • Hot Module Replacement (HMR) ΋γϯϓϧͳ ͨΊ଎͍

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ػೳ • Bare Module Resolving • Hot Module Replacement • TypeScript • CSS / JSON Importing • Asset URL Handling • PostCSS • CSS Modules https://github.com/vitejs/vite#features • CSS Pre-processors • JSX • Custom Blocks • Conﬁg File • Dev Server Proxy • Production Build • Modes and Environment Variables

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ػೳ • Web Assembly • Inline Web Workers • HTTPS/2 https://github.com/vitejs/vite#features

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ੜ·Εͨഎܠ • VuePress ͷىಈ͕஗ͯ͘ΠϥΠϥͨ͠ • SFC Λ ES Modules Ͱಈ͔͍ͨ͠ͱ͍͏Ξ ΠσΞ͕ੲ͔Β͋ͬͨ • Snowpack ͳͲͷ৽͍͠ ES Modules ϕʔ εͷόϯυϥ͕ग़ݱ͖ͯͨ͠

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ͦΜͳதΞΠσΞ͕෣͍߱Γ͖ͯͯੜ·Εͨ https://twitter.com/youyuxi/status/1252173663199277058

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Vite ͷݱঢ় • v1.0.0 RC ͱͯ͠ϦϦʔε͞Ε͍ͯΔͷ Ͱɺۙʑਖ਼ࣜ v1.0 ͕ϦϦʔε͞ΕΔݟࠐ Έ • ϓϩμΫγϣϯ޲͚ͷϏϧυ͸ɺ࣮࣭ rollup ͰϏϧυ͢ΔͷͰ࢖͑Δ͸ͣʂ...

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Vue ͱ Vite ͱͷؔ܎ • Vue 3 ޲͚ͷެࣜυΩϡϝϯτͰ Vite Λ ࢖ͬͨΠϯετʔϧʹ͍ͭͯॻ͍ͯ͋Δ • ͳͷͰɺVue ޲͚ʹ͸αϙʔτ͞Ε͍ͯ͘ ͷ͸ؒҧ͍ͳ͍

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։ൃ؀ڥ͕͙͢ʹ੔͏ʂ • npm init vite-app ͷΑ͏ͳίϚϯυ TypeScript ͱ͔ॾʑͷ؀ڥ͕੔͏ʂ • ͷͰɺΈͳ͞Μɺ࢖͍͖ͬͯ·͠ΐ͏ʂ

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@vuedx

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Vue developer experience • Vue ͷ DX ΛΑ͘͢Δ ͨΊͷπʔϧ • ίΞνʔϜͷ Rahul ࢯ (znck) ͕࡞੒த • ·ͩ Experimental https://twitter.com/znck0

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༨ஊ: ͪͳΈʹ Rahul ࢯ͸ 2018 ೥೔ຊʹདྷ͍ͯΔ • Vue Fes Japan 2018 • ίϯύΠϥपΓ͕ಘ ҙ • rollup-plugin-vue ͷ ։ൃऀ https://vuefes.jp/2018/speakers/znck/

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GitHub ϦϙδτϦ • @vuedx ͸ Rahul ࢯͷݸਓϦϙδτϦͰ։ ൃਐΊΒΕ͍ͯΔ https://github.com/znck/vue-developer-experience

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@vuedx ͸ͲͷΑ͏ͳ΋ ͷ(DX)Λఏڙ͢Δͷ͔

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@vuedx ͕ఏڙ͢Δ΋ͷ • @vuedx ͷΰʔϧͱͯ͠͸ҎԼΛఏڙ͢Δ͜ͱ • ಺ͰͷܕνΣοΫ • ίʔυิ׬ • ϦϑΝΫλϦϯάػೳ • SFC ͷ ES Modules Խ

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಺ͰͷܕνΣοΫ https://twitter.com/znck0/status/1290278773049286657/photo/1

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ϦϑΝΫλϦϯάػೳ • ͱͱͷಉظ • Props ͷมߋ • ίϯϙʔωϯτλάͷมߋ • ϑΝΠϧ໊มߋͱίϯϙʔωϯτͷநग़ • ม਺໊ͷมߋ • … ͳͲ

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σϞ • ྫ: ίϯϙʔωϯτλάͷมߋ https://twitter.com/znck0/status/1290577650398846976

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@vuedxͰ͸ ͜ΕΛͲ͏΍͍ͬͯΔͷ͔

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ΞʔΩςΫνϟ VS Code ͷ Language Service ʹύον͢Δ ײ͡Ͱ SFC Λॲཧ͍ͯ͠Δ

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Vue Virtual TextDocument • SFC ֤ϒϩοΫΛԾ૝ϑΝΠϧͱͯ͠ॲཧ component.vue component.vue____script.ts component.vue____template.ts component.vue____render.ts TS ͷίʔυ ͱͯ͠ॲཧ͢Δ

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@vuedxɺ Vetur ͱಉ͡Α͏ ͳπʔϧͰ͸ʁ

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Vetur ͸ࠓޙͲ͏ͳΔʁ

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ࠓޙ͸౷߹͍ͯ͘͠༧ఆ https://github.com/vuejs/vetur/issues/2016 Vetur ʹ @vuedx ͷTSϓϥάΠϯΛऔΓೖ ΕͯϦϑΝΫλϦϯάػೳΛஔ͖׵͑Δ

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ͦͷଞ

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Reactivity API

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Ҏલͷ2݄ͷൃදͷͱ͖͸ • reactive • computed • watch • readonly • ref • isRef • toRefs ্هͷΑ͏ͳجຊతͳAPI͔͠ͳ͔͕ͬͨ…

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͞ΒʹҎԼͷAPI͕૿͑ͨ • shallowReactive • shallowRef • markRaw • triggerRef • isReactive • isProxy • toRaw ओʹύϑΥʔϚϯεͷ࠷దԽɺߴ౓ͳ͜ͱ ͍ͨ͠ਓ޲͚ʹެ։͞Εͨ

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ৄ͍͠ৄࡉ͸ެࣜυΩϡϝϯτͰ Reactivity API ͷ߲໨ʹࡌ͍ͬͯ·͢ https://v3.vuejs.org/api/basic-reactivity.html#reactive

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Vue.js ίΞνʔϜͷهࣄ΋ಡΉͱΑ͍ • Reactive ͷྺ࢙Λަ͑ͳ͕Βղઆ͍ͯ͠Δ https://dev.to/jinjiang/understanding-reactivity-in-vue-3-0-1jni

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෼͔Γ΍͍͢ Reactivity API ʹ͍ͭͯͷࢿྉ • Ref ͱ Reactive Λ࢖͍෼͚͕೔ຊޠͰ෼͔ Γ΍͘͢ॻ͍ͯΔ https://speakerdeck.com/kawamataryo/ref-vs-reactive-vue-composition-api-deep-in

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@vue/ composition-api

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v1.0.0 ͕ϦϦʔε͞Εͨ • δϣΠϯͨ͠ Anthony ࢯ΍ Carlos ࢯʹΑͬͯ։ൃ͕ਐ Μͩ • vue-next ͔Β଍Γͳ ͍API͕όοΫϙʔ τ͞Ε͍ͯΔ Anthony ࢯ Carlos ࢯ

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͜Ε͸Ͳ͏͍͏͜ͱʁ

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ॳظͷࠒ͸஫ҙॻ͖͕͋ͬͨ https://github.com/vuejs/composition-api/commit/bde4d1b1900c98e13d7ec3e555425e19afc1b3f1#diﬀ-04c6e90faac2675aa89e2176d2eec7d8 ຊ൪؀ڥͰ࢖͏ͷ͸ਪ঑͠ͳ͍ʂͱ

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։ൃ͕ਐΉΑ͏ʹͳ͔ͬͯΒ͸… • όοΫϙʔτ͢Δ͏ͪʹ͜ͷ஫ҙॻ͖͸ ͳ͘ͳͬͨ https://github.com/vuejs/composition-api/commit/7e6598cddebfc2c7ec307838b3eae8a1fcc0ce8b#diﬀ-04c6e90faac2675aa89e2176d2eec7d8

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ͭ·Γɺຊ൪؀ڥͰ࢖͑Δ͜ͱΛҙຯ͠·͢ • Vue 3 ͸ RC ϑΣʔζ • Vue 2 ͱ Vue 3 Λ ޓ׵ΛอͭϥΠϒ ϥͳͲ࡞͍ͬͯΔ ࡞ऀʹΑ࣮ͬͯূ ͞Ε͍ͯΔ Anthony ࢯ Carlos ࢯ

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ͭ·Γɺຊ൪؀ڥͰ࢖͑Δ͜ͱΛҙຯ͠·͢ • ެࣜతʹ͸அݴ͸͍ͯ͠ͳ͍͕ɺόοΫ ϙʔτ͸੒ޭͨ͠ͱʂ໌ݴ͍ͯ͠Δ

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͝ར༻͸ܭըతʹ • ੍ݶࣄ߲͕͋Δ https://github.com/vuejs/composition-api#limitations

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͝ར༻͸ܭըతʹ • ύϑΥʔϚϯε͕ؾʹͳΒͳ͍͔Ͳ͏͔ https://antfu.github.io/vue-composition-api-benchmark-results/

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·ͱΊ

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• Ҏલࣗ෼͕ൃද͔ΒɺVue 3 RC ͕ϦϦʔε͞ΕΔ·Ͱʹ͍Ζ ͍Ζͱਐల͕͋ͬͨ • SFC վળ RFC • Vite ര஀ • @vuedex ͷ։ൃ • @vue/composition-api 1.0 ϦϦʔε • ࠓޙ΋ਖ਼ࣜϦϦʔε·Ͱʹਐల͕͋Δͱࢥ͏ͷͰɺ৘ใ ΩϟονΞοϓ͍͚ͯͨͩ͠Ε͹ɻ ·ͱΊ

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࠷ޙʹ

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• ΑΓOSS։ൃͷ׆ಈ͍͖͍ͯͨ͠ͷͰɺα ϙʔτͯ͘͠ΕΔͱ͏Ε͍͠Ͱ͢ʂ GitHub Sponsors https://github.com/sponsors/kazupon

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͝ਗ਼ௌ ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ