ReactとTypescript製Webアプリ作成で得た知見を共有したい

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React / Typescirpt੡ WebΞϓϦ࡞੒Ͱಘͨ ஌ݟΛڞ༗͍ͨ͠

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Java / JavaScript / AWS / Vim / Ϛωδϝϯτ ͸͡Ί·ͯ͠! Taiki Nishi @nkgrnkgr Nokogiri Blog Home WebΞϓϦέʔγϣϯΤϯδχΞ ๏ਓ޲͚άϧʔϓ΢ΣΞαʔϏεͷ։ൃ Nokogiri(@nkgrnkgr) Speaker Deck

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React࢖ͬͨ͜ͱ͋Γ·͔͢ʁ

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Typescript࢖ͬͨ͜ͱ͋Γ·͔͢ʁ

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ϓϥΠϕʔτͰReact/TypescriptΞϓϦΛ࡞੒ͨ͠ͷͰ ϋϚͬͨ͜ͱ΍Կʹ೰ΜͰͲ͏ղܾ͍͔ͯͬͨ͠Λ ൃද͍ͨ͠ͱࢥ͍·͢ ຊ೔࿩͢͜ͱ

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ຊ೔ͷ໨ඪ React ݰਓͷํ͔ΒϚαΧϦ(ॿݴ)Λ௖͖஌ݟΛಘΔ͜ͱ React ϏΪφʔͷํͷͨΊͷਓபʹͳΔ͜ͱ

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ΞδΣϯμ ࡞ͬͨΞϓϦέʔγϣϯͷ঺հ σʔλߏ଄ͱAPIઃܭ ϞδϡʔϧͷσΟϨΫτϦߏ੒ ωετͷਂ͍ State ͷߋ৽ CSS͸ͳΔ΂͘ॻ͖ͨ͘ͳ͍ Typescriptಋೖ ύϑΥʔϚϯενϡʔχϯά ͦͷଞΑ͋͘Δબ୒ࢶ͸Ͳ͏͔ͨ͠ʁ (͓·͚)VSCodeͱChromeʹΑΔσόοά

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ExpensesAutomation ࡞ͬͨΞϓϦέʔγϣϯͷ঺հ 1

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Google Caledar ʹొ࿥ͨ͠༧ఆ͔Βަ௨අΛܭࢉ͠ܦඅਫ਼ࢉ༻ʹϑ ΥʔϚοτͨ͠CSVΛग़ྗ͢ΔΞϓϦέʔγϣϯ expenses-automation Github

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࣮ԋ

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σʔλߏ଄ͱAPIઃܭ 2

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σʔλߏ଄ͱAPIઃܭ ݄ຖͷσʔλͷߏ଄ records ͷ1ߦ • ݄ຖͷσʔλΛαʔόʔ͔ΒFetch͠·͢ • React ͷ MainͷStateʹͦͷ··ಥͬࠐΜͰ͍·͢

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ϞδϡʔϧͷσΟϨΫτϦߏ੒ 3

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ϞδϡʔϧͷσΟϨΫτϦߏ੒ • components … React ίϯϙʔωϯτ • logic … ۀ຿ϩδοΫ • api…αʔόʔ௨৴༻ ྫ) fetchOauthUrl, fetchRecordsͳͲ • domain…σʔλΫϥε(PropsͷIF) RecordsForMonth, PathͳͲ ɹɹɹClassͰ͸ͳ͘ओʹTypescriptͷInterface͕ೖ͍ͬͯ·͢ɻ • service…State಺ͷRecordͷ௥Ճɾߋ৽ɾ࡟আؔ਺Λ΋ͭΫϥε • util…ڞ௨ܥ ೔෇ͷॲཧͱ͔ • ίϯϙʔωϯτͱϏδωεϩδοΫ͸෼཭͍ͨ͠ • ϏδωεϩδοΫ෦෼͸SpringBoot Λࢀߟʹ͍ͯ͠Δ

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ωετͷਂ͍ State ͷߋ৽ 4

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ωετͷਂ͍ State ͷߋ৽ • State ͷ͏ͪߋ৽͍ͨ͠ͷ͸ ݄ʼ೔ʼϨίʔυʼҠಈ৘ใ(from,to)ʼӺ໊ • ReactͷsetState͸State͕࣋ͭୈҰ֊૚ͷΦϒδΣΫτͷߋ৽͔͠Ͱ͖ͳ͍ • ”n”೔ͷ”m”൪໨ͷϨίʔυͷ “to” ͷ ”Ӻ໊” Λมߋ͢Δ৔߹ʹɺ݄ຖͷStateͷ ߋ৽͕ඞཁ Stateͷ݄৘ใΛίϐʔͯ͠Ұ෦Λߋ৽͠ ݄৘ใຖ্ॻ͖͢Δͱ͍͏Ξϓϩʔν͕ඞཁ

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ωετͷਂ͍ State ͷߋ৽ https://facebook.github.io/immutable-js/ Ҿ਺ʹ഑ྻͰkey or index Λ౉͢͜ͱͰਂ͍ωετͷߋ৽͕Մೳ • Imuutable.js͸ෆมσʔλߏ଄Λѻ͏Facebook੡ͷϥΠϒϥϦ • Immutable.js ͷ updateIn ؔ਺Λར༻ͯ͠ωετͷਂ͍ΦϒδΣΫτͷ৘ใߋ ৽Λߦ͏

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CSS͸ͳΔ΂͘ॻ͖ͨ͘ͳ͍ 5

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CSS͸ͳΔ΂͘ॻ͖ͨ͘ͳ͍ • ࣾ಺޲͚ͳͷͰσβΠϯʹڽΔඞཁ͸ͳ͍ • 0͔Βࣗ෼Ͱॻ͘ͷ͸͕͢͞ʹͭΒ͍ • બ୒͠ͱͯ͠͸ҎԼ̎ͭΛݕ౼ 1. MaterialUI ͳͲͷ ReactComponentϥΠϒϥϦ 2. BootStrap ͳͲͷ CSSϑϨʔϜϫʔΫ ReactComponent … ݸਓతʹ͸CSSϑϨʔϜϫʔΫΑΓ͸ֶश ίετ͕ߴ͍ɻܕఆ͕ٛͳ͍ϥΠϒϥϦ͸࢖͑ͳ͍ CSSϑϨʔϜϫʔΫ … αΠυόʔͷ։ดͱ͔JS͕ඞཁͳΠϯλ ϥΫγϣϯ͸ͳ͍ͷͰࣗ࡞͢Δඞཁ͋Γ ࠓճ͸CSSϑϨʔϜϫʔΫͰʂ

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CSS͸ͳΔ΂͘ॻ͖ͨ͘ͳ͍ https://bulma.io/ • Flexbox ϕʔεͷCSSϑϨʔϜϫʔΫ • JSͳ͠Ͱಈ͖ɺ࢖͍ํ͕؆୯Ͱֶशίετ͕௿͍ • ͦΕͳΓͷݟͨ໨Λ࠷୹Ͱ࡞Δͱ͍͏໨తʹ߹க • ΞΠίϯ͸FontAwesomeʢbulmaͰ΋ਪ঑ʣ ՄೳͳݶΓBulma ͷඪ४ΫϥεΛ࢖͍ɺ marginͱ͔paddingͱ͔Ξχϝʔγϣϯ͚ͩࣗ࡞͢ΔΑ͏ʹͨ͠

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Typescriptಋೖ 6

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ɾҰൠతʹ͸ܕఆٛͰ҆શ҆৺͕ͩɺ։ൃεϐʔυ͕མͪΔͱฉ͕͘ɺ ɹࠓճ͘Β͍ͷ։ൃن໛ʢෳࡶ͞΍ਓ਺ʣͩͱܕ҆શͷԸܙ͸ײ͡ͳ͍ ɹͨͩ͠ɺInterfaceఆٛʹΑΔVSCodeͷೖྗิ׬ͷԸܙ͸͍͢͝ɻ ɹͲ͏ͤPropsTypeͰܕνΣοΫΛ͢ΔͷͰखؒ͸มΘΒͳ͍͸ͣɻ ɹ࢖͑ΔͳΒTypescript ࢖ͬͨํ͕͍͍☺ ɾܕఆ͕ٛͳ͍ϥΠϒϥϦΛ࢖͏ͱ͖͸ࣗ෼Ͱ༻ҙ͢Δඞཁ͕͋Δ ɹͦ͏͍͏ҙຯͰ͸طଘͷϓϩδΣΫτʹ͸ೖΕʹ͍͔͘΋͠Εͳ͍͠ ɹࣗવͱܕఆٛͷ͋ΔϥΠϒϥϦΛબͼ͕ͪ ಋೖͯ͠Έͯ Typescriptಋೖ

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ύϑΥʔϚϯενϡʔχϯά 7

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ɾ৘ใྔʹൺྫͯ͠ೖྗ͕ΧΫͭ͘Α͏ʹͳΔ ɹ࠷ऴతʹ1จࣈຖʹ4ඵ͔͔ΔΑ͏ʹͳΔ… ɾStateͰߋ৽͢Δσʔλྔ͕ଟ͗͢Δͷ͔ʁ ɹͱࢥ͍Twitterʹ์ྲྀͯ͠ΈͨΒ… ೖྗ࣌ͷඳը஗Ԇ ύϑΥʔϚϯενϡʔχϯά

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͙͢ʹϑΥϩΞʔ͞Μ͔Βίϯϙʔω ϯτͷ࠶ϨϯμϦϯά͕ݪҼͰ͸ͳ͍ ͔ʁͱͷࢦఠ͕ʂ Twitter͍ͬͯ͢͝ʂ·͡ײँ ύϑΥʔϚϯενϡʔχϯά Ͱ͸Ͳͷίϯϙʔωϯτͷ࠶ϨϯμϦϯάʹ͕͔͔͍࣌ؒͬͯΔͷ͔Λ୳͢ɻ Ͳ͏΍ͬͯʁ

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ReactDevToolsͷProfiler … Chrome ֦ு ύϑΥʔϚϯενϡʔχϯά ίϯϙʔωϯτͷඳըʹ͔͔͕ͬͨ࣌ؒදࣔ͞ΕΔ

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ύϑΥʔϚϯενϡʔχϯά Stateͷߋ৽࣌ʹલޙͷ஋ʹҧ͍͕ͳ͍৔߹Ͱ΋ɺStateͱPropsΛ΋ͭ΄΅શͯ ͷίϯϙʔωϯτ͕࠶ඳը͞Ε͍ͯΔɻ →React.shouldComponentUpdate(): boolean Λ͔ͭͬͯ࠶ඳըΛ੍ޚ͢Δ ɹࠓճ͸Props, StateΛ΋ͭશͯͷίϯϙʔωϯτ͕BaseComponentΛ ɹܧঝ͢ΔΑ͏ʹͨ͠

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ͦͷଞΑ͋͘Δબ୒ࢶ͸Ͳ͏͔ͨ͠ʁ 8

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౰ॳʣΞϓϦࣗମ͕খ͘͞PropsόέπϦϨʔ͸ۤʹͳΒͳ͍ͱ൑அ ݱࡏʣখͯ͘͞΋όέπϦϨʔ͸͋ΔͷͰ΍ͬͺΓೖΕ͓͚ͯ͹ྑ͔ͬͨ Redux … ࠓճ͸ಋೖͳ͠ ͦͷଞΑ͋͘Δબ୒ࢶ͸Ͳ͏͔ͨ͠ʁ ࠷ॳ͸State͸ϝΠϯ͚ͩʹ΋ͨͤΔઃܭ͕ͩͬͨɺϝΠϯͰ؅ཧ͢΂͖Ͱͳ͍ StateΛ֤ίϯϙʔωϯτ΍ͦͷ਌ʹ࣋ͨͤΔ͜ͱʹͳͬͨͷͰɺ௨ৗͷClass ΋ར༻͍ͯ͠Δɻ ·ͨFunctionalComponentΛ࢖͏͚ͩͰ͸ɺෆཁͳ࠶ϨϯμϦϯάͷ໰୊΋ղ ܾ͠ͳ͍ɻshouldComponentUpdate͕࣮૷͞Ε͍ͯͳ͍ͷͰ recompose ͱ͍ ͬͨผϥΠϒϥϦ͕ඞཁʹͳΔɻͱ͍͏ͷͰΊΜͲ͘͘͞ͳͬͨɻ FunctionalComponent … 4UBUF͕ͳ͍΋ͷ͚͔ͩͭͬͨ

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(͓·͚) VSCodeͱChromeʹΑΔ σόοά 9

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VSCode֦ுΛ࢖ͬͯReactΞϓϦΛσόοά͢Δ ͓·͚ launch.json Debugger for Chrome ReactΞϓϦىಈ