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ϑ ϩ ϯ τ Τ ϯ υ Τ Ω ε ύ ʔ τ ν ʔ Ϝ ֎ দ ढ़ ঘ TypeScriptೖ ʙܕͷ͋ΔϞμϯͳJavaScriptʙ FrontendBar#6 2019/4/19ɹ
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TypeScriptೖ ʙܕͷ͋ΔϞμϯͳJavaScriptʙ
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•ॻ͍ͨ͜ͱ͋ΔΑ •ฉ͍ͨ͜ͱͳΒ •ࠓճॳΊͯͬͨ TypeScript
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•TypeScriptͬͯͳʹʁ •ܕͷ͋ΔJavaScript •TypeScriptͷػೳ/ॻ͖ํ •࣮ࡍͷ։ൃڥTypeScriptΛͬͨίʔσΟϯά •͍Ζ͍Ζ໘ͰͷTypeScript ࠓ ͢͜ͱ
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•ʮTypeScriptͳΜͱͳ͘Θ͔ͬͨʂʯ •ʮ࣍ɺ৽͘͠JavaScriptΛ͏ϓϩδΣΫτͰ TypeScriptͬͯΈΔͧʯ •ʮ͍·खݩʹ͋ΔJavaScriptͷϓϩδΣΫτΛ TypeScriptʹॻ͖͑ͯΈΑ͏͔ͳ…ʯ ࠓͷΰʔϧ
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TypeScriptͬͯͳʹʁ 1
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TypeScript….ܕΛ࣋ͬͨJavaScriptͷεʔύʔηοτ ɹɹMicrosoftʹΑͬͯ։ൃ͞Εɺϝϯςφϯε͞Ε͍ͯΔ ɹɹΦʔϓϯιʔεͷ੩తܕ͖ϓϩάϥϛϯάݴޠ TypeScript
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ͬ͘͟ΓΠϝʔδͰ͍͏ͱ ಉ͡ΧΤϧ͚ͩͲ…
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ͬ͘͟ΓΠϝʔδͰ͍͏ͱ JavaScript greeter.js
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ͬ͘͟ΓΠϝʔδͰ͍͏ͱ TypeScript greeter.ts
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ͬ͘͟ΓΠϝʔδͰ͍͏ͱ TypeScript greeter.ts
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TypeScriptJavaScriptʹՃ͑ͯ ܕΛ͍࣋ͬͯΔ ΄ͱΜͲJavaScript ͚ͩͲͶ ܕʹ͍ͭͯ͜ͷ͋ͱઆ໌͢ΔΑ
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TypeScriptίϯύΠϧ͢Δͱ JavaScriptʹͳΔ ม (ίϯύΠϧ) ੜ͞ΕͨJavaScript͍ͭ Ͳ͓ΓϒϥβͰಈ͘ greeter.ts greeter.js $ tsc greeter.ts
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TypeScript Playground https://www.typescriptlang.org/play/
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•TypeScript͍·ͱͯීٴ͍ͯ͠·͢ •̍͘͜͜Β͍Ͱ৽͘͠࡞ΔϓϩδΣΫτ͍͍ͩͨ TypeScriptͳΠϝʔδ •͜Ε·ͰJavaScriptΛ͍ͬͯͨΑ͏ͳγνϡΤʔγϣϯͰ ͱΓ͋͑ͣTypeScript σϑΝΫτʹͳΓͭͭ͋ΔTypeScript ͱʹ͔͘DX͕ ্͕Δ
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npm trends
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ʰTypeScriptΛಋೖ͖͔͢ʱ ͰΉ࣌طʹऴΘ͍ͬͯΔ “ ͱ͍͏ҙݟ͋Δ
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•JavaScriptΛ͏γνϡΤʔγϣϯͳΒ TypeScript(TS)͕͑Δ Ex: WebͷϑϩϯτΤϯυɺNodejs + TypeScript, React/Vue/Anguler + TS, kintone customize JavaScript͑ΔͳΒTypeScriptͰ
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ܕͷ͋ΔJavaScript 2
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TypeScript….ܕΛ࣋ͬͨJavaScriptͷεʔύʔηοτ ɹɹMicrosoftʹΑͬͯ։ൃ͞Εɺϝϯςφϯε͞Ε͍ͯΔ ɹɹΦʔϓϯιʔεͷ੩తܕ͖ϓϩάϥϛϯάݴޠ TypeScript ࠶ܝ
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•ܕɺͲ͏͍͏छྨͷσʔλ/͔ʁͱ͍͏ใ •person.firstNameͲ͏͍͏छྨͷσʔλʁ •͜Ε͘Β͍ͩͬͨΒจࣈྻͩͱΘ͔Δ ܕʁ greeter.js
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•num, digitʁ •n, m, sͲΜͳσʔλ͕ೖͬͯͦ͏ʁ •৽͘͠ݟͨਓݺͼग़͠ଆΛݟͳ͍ͱ͔Βͳ͍ •ਓ͕͓͔֮͑ͯͳ͍ͱ͍͚ͳ͍ ෳࡶͳ߹ʁ
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•࣮ߦ͠ͳͯ͘ɺͲΜͳछྨͷσʔλ͕ೖ͍ͬͯΔ͔͔Δ ܕ͕͋Δͱ greeter.ts
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•ؒҧ͍͑ͨํΛͨ͠ΒϦΞϧλΠϜͰΤσΟλ͕ڭ͑ͯ͘ΕΔ ܕ͕͋Δͱ
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ܕͷྫ@TypeScript ਅِܕ จࣈྻܕ ྻܕ ܕ ͳΜͰܕ
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݁ہܕ͕͋ΔͱԿ͕خ͍͠ʁ ϦϑΝΫλ͕༰қ େن։ൃͰ҆શ ೖྗͷิ ΤϥʔϛεΛΤσΟλ্Ͱݕग़ ࣮ߦ͠ͳ͔ͯ͘Δ DX(։ൃͷੜ࢈ੑ)্͕͢Δʂ TypeScriptΛ͏ͱԿ͕خ͍͠ʁ
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Ͱશ෦ʹܕΛॻ͘ͷ໘… •TypeScriptܕਪͱ͍͏ػೳ͕͋Γ·͢ •ܕΛ໌ࣔతʹॻ͔ͳͯ͘TypeScript͕উखʹ ʮ͜Εfalseೖͯ͠Δ͔ΒbooleanܕͶɻʯͱஅͯ͘͠ΕΔ •ͭ·ΓܕΛॻ͔ͳͯ͘ɺͱΓ͋͑ͣTypeScriptʹ͓͚ͯ͠ ܕνΣοΫͷԸܙड͚ΒΕΔ
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Α͠ʂTypeScriptಋೖ͠Α͏ •JavaScriptͰॻ͍͍ͯΔϓϩδΣΫτʹTypeScriptΛಋೖ͢Δ ϋʔυϧͱ͍ͯ •JavaScriptTypeScriptͰ͋Δ •ͯ͢ͷJavaScriptɺߏจతʹTypeScriptͱͯ͠ਖ਼͘͠ɺ ίϯύΠϧͯ͠ݩͷJavaScriptͱಉ͡ৼΔ͍Λ͢Δ •ίϯύΠϧΤϥʔ͕͋ͬͯJSੜ͞ΕΔ
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TypeScriptͷػೳ/ॻ͖ํ 3
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https://stackblitz.com/ ϒϥβ্Ͱ͙͢ʹ ࢼͤΔΑ
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ܕͷએݴ •ޙஔλΠϓͷܕΞϊςʔγϣϯ •มؔύϥϝʔλͷ͋ͱʹ : ܕ ͱ͍ͬͨ෩ʹॻ͘ ؔύϥϝʔλ ม ؔͷΓ
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ܕͷએݴ Φϓγϣϯύϥϝʔλ ϢχΦϯܕ = จࣈྻܕ·ͨܕ
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جຊతͳܕ •جຊతͳσʔλܕ༻ҙ͞Ε͍ͯΔ ਅِܕ จࣈྻܕ ྻܕ ܕ ͳΜͰܕ ฦΓͳ͠ ΦϒδΣΫτܕ
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ࣗͰܕΛఆٛ͢Δ •جຊతͳܕ͚ͩͰෆे •ࣗͷϓϩάϥϜʹԠͨ͡ܕ ͕ཉ͍͠ •interface type ΩʔϫʔυΛ ͬͯܕΛఆٛ͢Δ
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kintone ΦϒδΣΫτͷܕΛఆٛ͢Δͱ
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TypeScriptʹ͍Ζ͍Ζͳػೳ͕͋Δ •࠷ॳෳࡶͳ͜ͱ͠ͳ͍͍ͯ͘ͷͰɺগͣͭ͠ศརͳػೳΛ ͍͚͍͍֮͑ͯɻ •ΤσΟλౖ͕ͬͯ͘ΕΔͷͰɺௐΕͦͷ͏͍֮ͪ͑ͯ͘ ྫʣ TypeGuard, Readonly, Index Signatures, Never Type, TypeAssertion Enum, Generics, Union Type, Intersection Type, Literal Types
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࣮ࡍͷ։ൃڥTypeScript ΛͬͨίʔσΟϯά 4
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։ൃڥ(3Step) 1. $ npm i -D typescript 2. $ npx tsc —init 3. $ npx tsc src/**/*.ts 1. TypeScriptΛΠϯετʔϧ ίϯύΠϥͱͯ͠tsc͕ೖ͍ͬͯΔ 2. ઃఆϑΝΠϧ(tsconfig.json)ͷܗੜ 3. TSϑΝΠϧΛίϯύΠϧɻJS͕ੜ͞ΕΔ Step 02 Step 03 Step 01
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tsconfig.json
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tsconfig.json ίϯύΠϧͷઃఆtsconfig.jsonʹॻ͘ جຊతʹܗ௨ΓͰOK ੩తܕͷݎ͞ΛॊೈʹઃఆͰ͖Δ ؤுΓͨ͘ͳ͍߹ɺઃఆͰ؇ΊΔ DOMESͷܕใ͕ཉ͍͠ͳΒ libͰࢦఆ͢Δ ex: ”lib”: ["dom", “es2018”]
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ݹ͍ESͷม tsconfig.jsonͷtargetͰͲͷECMAScriptͷJavaScriptΛੜ͢ Δ͔ࢦఆ͢Δ IE11ʹରԠ͢ΔͳΒ”es5” ⾠TypeScript͕໘ΛݟΔͷSyntax͚ͩ⾠ ϨΨγʔϒϥβʹ૬มΘΒͣES6ʙͷػೳແ͍ͷͰ Polyfillผ్ೖΕͳ͍ͱͩΊ(ex:Promise, Array.from) core-jsͳΓɺbabel-polyfillͳΓ
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ΤσΟλ VSCodeIntelliJϓϥάΠϯΛೖΕͳͯ͘σϑΥϧτͰ TypeScriptʹରԠ͍ͯ͠Δ ͙͢ิΤϥʔදࣔͷԸܙ͕ड͚ΒΕΔ VimEmacsϓϥάΠϯೖΕΕOK
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Lint TSLint͏Θͳ͍ ͜Ε͔ΒTypeScriptͰLintΛೖΕΔͳΒESLintͰOK @typescript-eslint/eslint-pluginΛ͏ @cybozu/eslint-config/presets/typescript͋ΔΑ ৄ͘͠ https://teppeis.hatenablog.com/entry/2019/02/typescript-eslint
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ܕఆٛ ࣗͰܕఆٛΛॻ͘ͷେม Reactͱ͔ͷϥΠϒϥϦͲ͏͢Ε͍͍ͷʁʁ ·͔ࣗ͞Ͱॻ͘ͷʁ
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@types ࣗͰෳࡶͳܕఆٛΛ͢Δඞཁ͋Γ·ͤΜ ͍͍ͩͨͷϥΠϒϥϦܕఆٛϑΝΠϧΛ༻ҙͯ͘͠Εͯ· ͢(Definitely Typed) ͦͷϑΝΠϧΛΠϯετʔϧ͢Δ͚ͩ ྫ͑ Reactͷ߹ $ npm install -D @types/react kintone CustomizeͳΒ@kintone/dts-gen https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types
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͍Ζ͍Ζ໘ͰͷTypeScript 5
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ʓʓ+TypeScript React + TypeScript Nodejs + TypeScript webpack + Babel + TypeScript jquery + TypeScript ReactNative + TypeScript Vue.js + TypeScript Anguler + TypeScript ɹɹɹɹɹɹɹɹɹɹɹɹetc جຊతʹͲ͜Ͱ͑ΔΠϝʔδ
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React + TypeScript React+TypeScriptΛࢼ͢ͳΒɺcreate-react-appͰڥΛ؆୯ ʹ࡞ΕΔ $ npx create-react-app my-app --typescript
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QuickStart https://www.typescriptlang.org/samples/index.html ͦΕͧΕΠϯετʔϧ͢ΔϥΠϒϥϦઃఆํ๏ͪ͜ΒΛࢀߟʹ
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·ͱΊ TypeScriptΛศརʹ͍ͬͯ͘ڥ͍ͬͯΔ TypeScript ͕ͲΜͳͷ͔հ͠·ͨ͠ TypeScriptͷಋೖϋʔυϧͱ͍ͯɻͳͷʹԸܙେ͖͍ ੋඇɺ࣍ʹJavaScriptΛॻ͘Α͏ͳϓϩδΣΫτͰɺ TypeScriptΛೖΕͯΈ͍ͯͩ͘͞
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͓·͚
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•TypeScript Deep Dive ຊޠ൛ https://typescript-jp.gitbook.io/deep-dive/ •ຊޠͰTypeScirptΛҰ௨ΓֶΔ •TypeScriptͰkintoneΧελϚΠζ։ൃΛͯ͠ΈΑ͏ https://developer.cybozu.io/hc/ja/articles/360023293091 •TypeScript࠶ೖ ― ʮ͕ΜΒͳ͍TypeScriptʯͰɺ JavaScriptΛ“ॊΒ͔͍”੩తܕ͖ݴޠʹ https://employment.en-japan.com/engineerhub/entry/2019/04/16/103000 •࣮ࡍͷϓϩδΣΫτͰ͏લʹಡΜͰ͓͘ͱྑ͍ TypeScriptͬͯ࣌͘ͷ͓͢͢Ί