日経電子版のマイクロフロントエンドとPWA / devsum2019

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೔ຊܦࡁ৽ฉࣾ ٶຊ ক (@shqld) 1 ೔ܦిࢠ൛ͷ ϚΠΫϩϑϩϯτΤϯυͱ PWA

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!2 - ໊લ - ٶຊ ক (Sho Miyamoto) - @shqld (Twitter, GitHub) - ࢓ࣄ - ೔ຊܦࡁ৽ฉࣾͷ૯߹৬ - r.nikkei.comͷϑϩϯτΤϯυɺ  όοΫΤϯυɺCDNपΓ - ܦྺ - 2017/9: ֶ෦ଔۀ - 2018/4: ೔ܦ ৽ଔೖࣾ - JavaScriptͱͯ΋޷͖ ͩΕʁ

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!3 - 2010೥3݄૑ץ - ຖ೔໿900ຊͷهࣄΛ഑৴ - ݄ؒ3ԯΞΫηεҎ্ - ੈք࠷େͷܦࡁϝσΟΞ - ࠶དྷि͸ʮถேट೴ձஊϥΠϒʯʂ ೔ܦిࢠ൛

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!4 Server (BFF) Client Node.js (w/ Express) VanillaJS  (Babel7) Sass handlebars  (& JSX) ిࢠ൛ͷٕज़ελοΫ Script Webpack4 Style Markup SSR CDN Fastly

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ϚΠΫϩϑϩϯτΤϯυઃܭ 5

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6 ϚΠΫϩϑϩϯτΤϯυͱ͸ https://micro-frontends.org

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7 ϚΠΫϩϑϩϯτΤϯυͱ͸ Monolithic Frontends Organisation  in Verticals https://micro-frontends.org

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8 - ϚΠΫϩαʔϏε on ϑϩϯτΤϯυ - લఏɿʢϞμϯʣ΢ΣϒΞϓϦ - Ұͭͷը໘Λෳ਺ͷαʔϏε  ʢಠཱͨ͠νʔϜʹΑΔػೳͷू߹ମʣʹ෼ׂ - SSR࣌ʹ݁߹ - ٕज़తཁૉ - SPA(s) - Web Components - SSI (ESI) ϚΠΫϩϑϩϯτΤϯυͱ͸

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ిࢠ൛͸ ʢϞμϯʣ΢ΣϒΞϓϦʁ !9

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!10 https://2018.ar.al/notes/the-documents-to-applications-continuum

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!11 https://2018.ar.al/notes/the-documents-to-applications-continuum ೔ܦిࢠ൛

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12 - શମతʹ͸ - WebDocuments & Content-Centric - MPA - ੩త - ϖʔδ୯ҐͰੑ࣭͕େ͖͘ҟͳΔ - τοϓɺهࣄ - ݕࡧɺMyχϡʔε - ΞϓϦέʔγϣϯدΓ - ಈత ೔ܦిࢠ൛ͷίϯςϯπ

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೔ܦిࢠ൛ͷϚΠΫϩઃܭ !13

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!14 - ʮҰͭͷը໘ʯ୯ҐͰ͸ͳ͘  ʮϖʔδ͝ͱʹʯϚΠΫϩαʔϏεʹ෼ׂ - CDN(Fastly)Ͱ֤αʔϏεΛ݁߹ ೔ܦిࢠ൛ͷϚΠΫϩઃܭ https://speakerdeck.com/ryysd/microservices-on-fastly

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!15 - ϖʔδ ≒ αʔϏε - ϦϙδτϦ - σϓϩΠϑϩʔ - ٕज़બ୒ - ։ൃऀ - ֤αʔϏεؒ͸ૄ݁߹ - ଞαʔϏεͰඞཁͳ΋ͷ͸APIԽͯ͠CDNܦ༝ͰऔΓʹߦ͘ - αʔϏεؒͰڞ௨͢Δίʔυ - ϓϥΠϕʔτͳnpmύοέʔδʹ - ֤ύοέʔδ͸ͨͩͷػೳ܈ - ࢖͏ଆ͕దٓ औࣺબ୒ ೔ܦిࢠ൛ͷϚΠΫϩઃܭ

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!16 Server (BFF) Client ڞ௨ϥΠϒϥϦ APIGW Fastly هࣄ τοϓ ݕࡧ

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ϚΠΫϩϑϩϯτΤϯυ  ͷԸܙ 17

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େ͖ͳมߋΛগͣͭ͠ !18

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TypeScriptΛಋೖͨ͠ !19

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!20 - JSͷͭΒ͞ - ʢαʔόʔαΠυʣϛυϧ΢ΣΞ΍ϧʔτ͝ͱͷॲཧɺҾճ ͢σʔλͷܗ - ʢϏϡʔʣίϯϙʔωϯτͷΠϯλʔϑΣʔε - ੩తܕݕ͕ࠪཉ͍͠ - Flow vs Typescript - Flow͸ܕਪ࿦ڧ͍ - ϓϩδΣΫτͷઃఆ͕ॊೈ͡Όͳ͍ - ϓϩδΣΫτΛ·͍ͨͰܕఆٛΛڞ༗͠ʹ͍͘ - ઴ਐతͳTypeScriptԽ - ·ͣ͸ίʔυͷগͳ͍̍αʔϏε͔Β TypeScriptಋೖ

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!21 - TypeScript with Babel - tsc͸͋͘·ͰܕͷνΣοΫ͚ͩ - τϥϯεύΠϧ͸ࠓ·Ͱ௨ΓBabel7Ͱ - @babel/preset-typescript - TS͔ΒTSཁૉΛফ͚ͩ͢ - ECMAScriptඪ४͔Β֎Εͳ͍ʢಠ֦ࣗு͸αϙʔτ͞Ε͍ͯ ͳ͍ e.g. Enumʣ - JavaScriptͱͷڞଘ - JS͸BabelΛ௨ͯ͠΋Կ΋ى͖ͳ͍ - ιʔεϚοϓͷੜ੒͚ͩͰܕఆ͕ٛڞ༗Ͱ͖Δ TypeScript with Babel

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!22 - `NoImplicitAny` ͸େม - ґଘϞδϡʔϧ΍ؔ਺ͷҾ਺  શͯʹܕΛ͚ͭΔඞཁ͕͋Δ - ίʔυͷن໛ʹΑͬͯ͸Ϟνϕʔγϣϯ͕ଓ͔ͳ͍ - ࠷ॳͷҰา͕Ұ൪େ͖͍นʹͳͬͯ͠·͏ - ޙ͔ΒͰ΋ྑ͍ ؤுΓ͗͢ͳ͍ܕ෇͚

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JSXΛಋೖͨ͠ !23

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!24 - ≠ Reactಋೖ - طଘͷςϯϓϨʔτΤϯδϯhandlebars͕ͭΒ͍ - ͋͘·ͰͨͩͷจࣈྻςϯϓϨʔτ - HTML༻͡Όͳ͍ - ϦϯτͰ͖ͳ͍ - (͜͜ʹ͸ऩ·Γ͖Βͳ͍) - handlebars͔ΒJSX with Reactʹஔ͖׵͑ͨ - ϏϡʔͷϚʔΫΞοϓΛJSXͰॻ͘ - expressͷrenderॲཧͰSSR(react-render-to-string) JSXಋೖ

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!25 - Ұ౓Ͱશஔ͖׵͑͸ແཧ - htmlʹԊͬͨύʔε͕Ͱ͖ͳ͍ͷͰػցతͳஔ׵΋ݫ͍͠ - ϑΝΠϧ਺͕ଟ͘ɺґଘؔ܎΋ෳࡶ - ΞμϓλʔΛڬΜͩ - JSX͔ΒHBSɺHBS͔ΒJSXΛ૬ޓʹݺ΂ΔΑ͏ʹͨ͠ - https://github.com/shqld/handlebars-jsx-adapter Handlebars -> JSX

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!26 - JSX(TSX)ͷྑ͞ - ิ׬ɺϑΥʔϚςΟϯά͕ޮ͘ - ঢ়ଶͷड͚౉͕͠໌֬ - ܕͰറΕΔ - ΫϥΠΞϯταΠυͰReactΛ࢖Θͳͯ͘΋े෼Ըܙ͕͋Δ - ͋ΔαʔϏεͰReactΛ࢖͍ͨ͘ͳͬͨΒطଘͷϏϡʔʹΫϥ ΠΞϯτॲཧΛॻ͖଍͚ͩ͢ - lit-htmlͱ͔htm΋΋ͬͱ੒ख़࢝͠ΊͨΒݕ౼͍ͨ͠ ςϯϓϨʔτΤϯδϯͱͯ͠ͷJSX

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!27 https://medium.com/dev-channel/a-netﬂix-web-performance-case-study-c0bcde26a9d9

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E2Eςετ on Codebuild !28

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!29 - E2E͸ӡ༻తʹ΋Ϧιʔεతʹ΋େม - ಛʹΫϩεϒϥ΢βʔ(incl. IE11) - ීஈ࢖͍ͷCircleCIͰ΍Δͱڞ༗ͷΩϡʔΛ٧·Βͤͯ͠·͏ - ͦ͏ͩɺCodeBuildͰ΍Ζ͏ʂ☺ - CircleCIͰϏϧυɺηΧϯμϦίϯςφʹσϓϩΠ - CodeBuildΛτϦΨʔ͢Δ - CodeBuild্ͰσϓϩΠ͞ΕͨηΧϯμϦͷURLʹରͯ͠E2Eς ετ - ੒ޭͨ͠Βεϫοϓ(Codebuild) E2Eςετ on CodeBuild

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!30 CodeBuild Github CircleCI build push deploy Secondary Primary swap E2E test test

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PWA 31

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!32 - ࠓߋײͷ͋Δ࿩Ͱ͕͢… - PWȀຊப - ৴པ(࣮֬)ੑ - ଎͞ - ΞϓϦͱͯ͠ͷັྗ PWA • Reliable - Load instantly and never show the downasaur, even in uncertain network conditions. • Fast - Respond quickly to user interactions with silky smooth animations and no janky scrolling. • Engaging - Feel like a natural app on the device, with an immersive user experience. https://developers.google.com/web/progressive-web-apps/

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Fast & EngagingΛ೦಄ʹ  ৭ʑ΍ͬͨ !33

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!34 AppShell - https://developers.google.com/web/fundamentals/architecture/app-shell

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!35 - https://developers.google.com/web/fundamentals/architecture/ app-shell - FirstPaint͕ߴ଎ʹͳΔ - ΦϑϥΠϯ࣌Ͱ΋࠷௿ݶͷΞϓϦײ͕ग़Δ - MPAͰ΋SPAͷΑ͏ͳUX - ͍·೔ܦిࢠ൛Ͱ͸࣮ݧத AppShell

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!36 - Πϝʔδɿίϯςϯπ෦෼ͷશLazyload - ྲྀΕɿ - SWͰφϏήʔγϣϯϦΫΤετΛδϟοΫͯ͠AppShellΛฦ ͢ - AppShellͷεΫϦϓτλάͰwindow.locationΛfetch - DOMΛॻ͖׵͑Δ - ग़͠෼͚ - CacheϛεɿAppShellΛฦ͢ - Cacheώοτɿͦͷ··ΩϟογϡΛϨϯμϦϯάͨ͠ํ͕ ଎͍ AppShellͷ࣮૷

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!37

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!38 - GoogleChromeLabs/quicklink - ը໘಺ʹೖͬͨaλάཁૉΛࣗಈͰϓϦ Ωϟογϡͯ͘͠ΕΔ͓खܰϥΠϒϥϦ - ॎʹΞΠςϜΛฒ΂ΔΑ͏ͳίϯςϯπʹ ͸޲͍͍ͯΔ

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!39 - IntersectionObserverͰviewportʹೖͬͨaλάΛ؂ࢹ - ༏ઌ౓ผͷઓུ - ߴ: fetch - ௿: ResourceHints௥Ճ (`

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!40 - hrefΛSWʹpostMessageͰ౉ͯ͠ϓϦΩϟογϡ - ϝϦοτ - UIεϨου͸observeͯ͠postMessage͢Δ͚ͩ - ϦΫΤετ͕ൃੜ͠ͳ͍෼ɺෛՙ͕গͳ͍ - طଘͷSWͷΩϟογϡઓུΛ׆͔ͤΔ - ҰݩతʹΩϟογϡΛѻ͑Δ - ༏ઌ౓Λؾʹ͠ͳͯ͘ྑ͍ with SW

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Critical CSS !42

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!43 Render – Critical Rendering Pathͷ࠷దԽ Request Page Start building DOM Build CSSOM Run JS Continue Building DOM Render Page GET html Response Response Response GET css GET js CSSϒϩοΩϯά JSϒϩοΩϯά

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!44 Render – Critical CSS • ϑΝʔετϏϡʔʹඞཁͳCSSͷΈΛinlineͰຒΊࠐΉ ɾ ɾ ɾ ←ͷදࣔʹඞཁͳ࠷௿ݶͷCSSΛ HTMLʹຒΊࠐΉ ←ͷCSS͸ը໘දࣔޙʹಡΈࠐΉ

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!45 Render – Critical CSS • ϑΝʔετϏϡʔʹඞཁͳCSSͷΈΛinlineͰຒΊࠐΉ • CSSऔಘʹඞཁͳϦΫΤετ਺ΛݮΒͤΔ • CSSOMߏஙɾϨΠΞ΢τͷ࣌ؒΛ࡟ݮͰ͖Δ

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!46 - ίϯςϯπ΍ձһଐੑʹΑͬͯඞཁͳCSS ͷ͹Β͖͕ͭେ͖͍ - e.g. ࣸਅɺϏσΦɺදɺPaywall - ಈతʹग़͠෼͚ΒΕͳ͍ - ʮίϯςϯπʹΑͬͯ͸ݟͨ໨͕େ͖͘ ่Εͯ͠·͏ʯ͸ڐ༰Ͱ͖ͳ͍ - ͍·͸ࣗಈੜ੒Ͱ͸ͳ͘ਓखͰ؅ཧ ೔ܦిࢠ൛ͷCCSSࣄ৘

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!47 - HTMLαΠζͷ50%લޙ͕CCSS - ʢαʔϏε͝ͱʹʣશϖʔδʹಉ͡CCSS͕ΠϯϥΠϯͰຒΊ ࠐ·Ε͍ͯΔ - CDNͷసૹྔͷແବ - ΫϥΠΞϯτΩϟογϡͷ༰ྔΛṧഭ - ௨৴ͷύϑΥʔϚϯεͷ௿Լ - ΠϯϥΠϯͳͷͰ੾Γ཭ͤͳ͍ - e.g. هࣄϖʔδ - CSS: 544k - CCSS: 489k CCSS͕ॏ͍

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Dynamic Critical CSS Optimization !48

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!49 - ֤ϖʔδ͝ͱʹ࠷దͳCCSSΛಈతʹϏϧυ͢Δ - ΦϦδϯ͔Β഑৴͢ΔHTMLʹ͸CCSSΛؚΊͳ͍ - ίϯςϯπ΁ͷϦΫΤετ͕͋Δ౓ʹɺVarnishͷESIΛ༻͍ͯ Vary͝ͱͷίϯςϯπʹ࠷దԽ͞ΕͨCSSΛੜ੒͠ɺS3ʹΞο ϓϩʔυ - ࠷దCCSSϏϧυ͕ऴΘͬͨΒΩϟογϡΛύʔδ - Edge-side Includes CCSS - ESIͰσϑΥϧτ(or ࠷దԽࡁ)CCSSͷಡΈࠐΈ - htmlͱ݁߹ - e.g. هࣄϖʔδ - CCSS: 489k - Optimized critical: 69k Dynamic Critical CSS Optimization

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!50 CSS Default CCSS / Dynamic CCSS HTML  w/ ESI tag CSS Complete HTML /article/123 Edge-side Includes Critical CSS (Origin Server) (CSS Server) build ESI request Fetch  contents Fetch  CCSS Purge cache

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!51 - ݱঢ়͸EBͰ৭ʑ΍ͬͯΔ - ੍໿͕ͳ͍ & σόοά͠΍͍͢ - Ϗϧυ͕٧·ͬͯαʔό͕མͪΔՄೳੑ͕͋Δ - CCSSͷ࠷దԽ෦෼͸αʔόϨεʹ͍ͨ͠ - ϦΫΤετϋϯυϦϯά: on CDN - Ϗϧυ: Lambda (w/ @serverless/chrome) Future Works

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!52 CSS Default CCSS / Dynamic CCSS HTML  w/ ESI tag Complete HTML /article/123 Serverless (Origin Server) Fetch  contents Fetch CCSS  as ESI request Purge Trigger build

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ϚΠΫϩϑϩϯτΤϯυͱ PWA !53

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ϞϊϦεԽ͢ΔServiceWorker !54

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- ServiceWorker͸ϞϊϦεʹͳΓ͕ͪ - ϚΠΫϩϑϩϯτΤϯυͳ؀ڥͳΒSW΋ϚΠΫϩαʔϏε ୯ҐͰ͋ͬͯ΄͍͠ - جຊతʹ͸มߋ͕શମʹ೾ٴͯ͠͠·͏ͷͰɺ༧ظͤ͵ෆ۩ ߹͕ͰΔՄೳੑ - είʔϓͰӨڹൣғΛݶఆͰ͖Δͷ͸҆৺ !55 ͏Θͬ…ࢲͷSWɺϞϊϦγοΫ͗͢…?

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ϚΠΫϩ ServiceWorkers !56

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!57 Server (BFF) Client Service  Worker هࣄ ݕࡧ τοϓ ڞ௨ϥΠϒϥϦ APIGW

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!58 - είʔϓ͕۠੾ΒΕ͍ͯΔͷͰɺͦͷαʔϏεͷ͜ͱ͚ͩΛߟ ͑Ε͹Α͍ͷͰ͔ͳΓ҆৺ɺσϓϩΠ΋ָ - ؆୯ - ֤ϚΠΫϩαʔϏεͷαʔόͰείʔϓΛݶఆͯ͠഑৴ - ϨεϙϯεϔομͰ`Service-Worker-Allowed`Λࢦఆ͢Ε͹ είʔϓͷύε੍ݶΛճආͰ͖Δ - ΫϥΠΞϯτଆͰݶఆ͞ΕͨείʔϓʹSWΛΠϯετʔϧ ϚΠΫϩαʔϏεϫʔΧʔ

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!59 - ֤ϫʔΧʔ͕উखʹଞͷϫʔΧʔͷΩϟογϡΛফͯ͠͠·͏ɺͱ͍͏ έʔε͕͋Δ - ಡΈग़࣌͠ʹଞͷϫʔΧʔͷΩϟογϡ͋ΔͳΒͦΕΛ࢖͍͍ͨ - ํ๏͸̎ͭ - ͦΕͧΕͷΩϟογϡΞΠςϜͷॴ༗ऀ͕୭͔Λ؅ཧ͢Δ - ಡΈग़͕͠଎͍ - Ωϟογϡɺύʔδ͕खؒ - GoogleͷWorkboxʹ৐͍ͬͯΔͱ೉͍͠ - ΩϟογϡετϨʔδΛαʔϏε͝ͱʹ੾Γ෼͚Δ - Ωϟογϡɺύʔδָ͕ - ಡΈग़͕͠஗͍ - ࠓ͸ͬͪ͜Ͱ࣮ݧத ϚΠΫϩͳΩϟογϡ؅ཧઓུ

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Feature Flags !60

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!61 https://martinfowler.com/articles/feature-toggles.html

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!62 - a.k.a Feature Toggles - ֎෦ͷίϯϑΟά(Key-Value)Λࢀর - ͦͷ஋ʹΑͬͯػೳΛग़͠෼͚Δ - SaaS΋͋Δ - http://featureﬂags.io/ - FirebaseͷRemoteConﬁgʢωΠςΟϒΞϓϦ޲͚ʣ Feature Flags

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Feature Flags for SW !63

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!64 - ϚΠΫϩαʔϏε(SW)Խʹ - ϑϥάͰΑΓҰݩతʹػೳ։ൃ/௥ՃΛ؅ཧ͍ͨ͠ - SWͷڍಈΛ֎͔Β੍ޚͰ͖ͳ͍ͷ͸ා͍ - PWA։ൃͰ΋μʔΫϩʔϯνΛ͍ͨ͠ Feature Flags for SW

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!65 - ServiceWorkerͷregisterPathʹϑϥά৘ใΛ৐ͤΔ - ϑϥά͕มΘΕ͹SW͕ߋ৽͞ΕΔ - φϏήʔγϣϯϦΫΤετ͕SWͰδϟοΫ͞Ε͍ͯΔͱ͖͸ ཁ஫ҙ - ిࢠ൛Ͱ͸NR͸جຊతʹશͯ `no-cache` Feature Flags for SW

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- ϚΠΫϩϑϩϯτΤϯυͰϚΠΫϩ։ൃ - TypeScript͸ݞͷྗΛൈ͍ͯऔΓ૊Ή - JSX͸ςϯϓϨʔτΤϯδϯͱͯ͠΋࠷ߴ - E2E͸ผͷCIͰ΍Δͱ͖ͬ͢Γ - AppShell & Quicklink ͓͢͢Ί - Edge-side optimizationʹ͸ເ͕͋Δ - ϚΠΫϩαʔϏεϫʔΧʔ҆৺ - Feature FlagsΛ࢖ͬͯμʔΫϩʔϯν !66 ·ͱΊ

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͋Γ͕ͱ͏͍͟͝·ͨ͠ !67