Rails + ReactなSPAサイトでのSEO / SEO at Rails + React SPA

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3BJMT3FBDUͳ 41"αΠτͰͷ4&0

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ࣗݾ঺հ w٢઒ਸྙ JEBEPSFDIJD w Φ΢νʔϊऔక໾$50 w όοΫΤϯυ԰ w ࠃ಺େखϒϩάαʔϏε΍ϨγϐαʔϏεձࣾͷόοΫΤϯυ w ݩ.JDSPTFSWJDFT͓͡͞Μ w CVJMEFSTDPOͰΩʔϘʔυ೤͕ߴ·͍ͬͯΔ

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41"4&0

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41"4&0΍Δલ w443͠ͱ͚͹͍͍ΜͰ͠ΐ w 443ͪ͠Ό͑͹ඇ41"αΠτͱಉ͡Α͏ͳ΋ΜͰ͠ΐ w Ͱ΋࠷ۙ͸+4ධՁͯ͘͠ΕΔΒ͍͠͠ෆཁ͔΋ w443ͷπʔϧ΋͍Ζ͍Ζ͋Γͦ͏ w IZQFSOPWBͱ͔/FYUKTͱ͔Α͘ฉ͘ʢҧ͍͸Α͘Θ͔͍ͬͯͳ͍ʣ wଞࣾͷߏ੒ࣄྫ͸ͪΒ΄Βݟ͔͚Δ w ͦΕࢀߟʹಋೖͰ͖ͦ͏

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ݱࡏͷߏ੒ w3FBDU w 3FEVY 4BHB 3FBDU3PVUFS 3FBDU)FBE w %ZOBNJD*NQPSUͰ$PEF4QMJUUJOH w XFCQBDLFS w $43༻ͱ443༻ͰXFCQBDLDPOpH͸݁ߏΧελϜ͍ͯ͠Δ w3BJMTIZQFSOPWB

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ͳΜ͔Ͳ͔͜Ͱݟͨ͜ͱ͋Δߏ੒ʁ

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41"4&0΍ͬͯΔ࠷த w443͠ͱ͚͹͍͍ͳΜͯ୭͕ݴͬͨΜͩʂʂʂ w ؾΛ͚ͭΔ͜ͱ͕ඇ41"ͱ݁ߏҧ͏ w ͦ΋ͦ΋443͕݁ߏ͍ͨ΁Μ wߏ੒͕Ұͭҧ͚ͬͨͩͰམͱ͕݀͠େྔʹ͋Δ w νϡʔτϦΞϧΛಈ͔͢ͷ͸؆୯ w ଞࣾࣄྫ͸ϗϯτʹࢀߟఔ౓ w ར༻͍ͯ͠Δ֤πʔϧΛͪΌΜͱཧղ͢Δඞཁ͕͋Δ

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࠷ऴߏ੒͚ͩ·ͱΊΔͱ ࣦഊͷྺ࢙͕఻ΘΒͳ͍ͷͰ ࣌ܥྻͰ͓఻͑͠·͢

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Φ΢νʔϊ wෆಈ࢈ʹؔ͢ΔαʔϏε w ෆಈ࢈ݕࡧϙʔλϧ w ϥΠϑελΠϧϝσΟΞ w ෆಈ࢈৘ใπʔϧ

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ܦҢ wαΠτϦχϡʔΞϧͰ3FBDU3BJMTʹͨ͠ w ࠷ॳ͸OPJOEFYͰݶఆతͳެ։Λ͍ͯͨ͠ wશମతʹ੾Γସ͑ΔલʹΠϯσοΫε͍ͤͯ͜͞͏ w ࠷ॳͷΰʔϧ͸͋͘·ͰΠϯσοΫεͤ͞Δ͜ͱ w ͜ͷஈ֊ͰݕࡧॱҐΛ͋͛Α͏ͱ·Ͱ͸ࢥ͍ͬͯͳ͔ͬͨ w ద੾ͳλάΛઃఆ͢ΔͳͲͯ͠OPJOEFYΛ֎ͨ͠ w +4ධՁ͞ΕΔΒ͍͠ͷͰ443ແ͠Ͱ༷ࢠΛݟΑ͏

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ΠϯσοΫε͞Εͳ͍ wݕࡧॱҐӠʑͰ͸ͳͦ͘΋ͦ΋ΠϯσοΫε ͯ͘͠Εͳ͍ w αΠτϚοϓૹ৴ͳͲ͸࣮ࢪ w ͙Β͍͔͠ΠϯσοΫε͞Εͳ͍ w λά͕ؒҧ͍ͬͯΔͱ͔͸ͳͦ͞͏ w ΍ͬͺΓ443͠ͳ͍ͱ͍͚ͳ͍ͷ͔ɾɾɾʁ

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ͦ΋ͦ΋443ͱ͸ wαʔόʔαΠυϨϯμϦϯά w αʔόʔଆͰ༧Ί+4Λ࣮ߦͯ͠%0.Λߏஙͯ͠ ͔ΒϨεϙϯεΛฦ͢

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ΫϥΠΞϯταΠυϨϯμϦϯά αʔόʔ ϒϥ΢β EJWEJW EJW UBCMFDMBTTGPP UBCMF EJW 'PP5BCMF IUNM +4 ΄΅ۭͷIUNMΛฦ͢ ΫϥΠΞϯτଆͰ3FBDU SFOEFSͯ͠ IUNMΛߏங͢Δ

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αʔόʔαΠυϨϯμϦϯά αʔόʔ ϒϥ΢β EJW UBCMFDMBTTGPP UBCMF EJW αʔόʔଆͰ 3FBDUSFOEFSͯ͠ IUNMΛ׬੒͔ͤͯ͞Β Ϩεϙϯε

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3BJMTͰ443͢Δ৔߹ wSFBDUSBJMT w 3BJMT্Ͱ&YFD+4ͰϨϯμϦϯά wIZQFSOPWB w 3BJMTͱ͸ผͷIZQFSOPWBαʔόʔʢ/PEFKT&YQSFTTʣͰϨϯμϦϯ άͯ͠3BJMT্ͰϚʔδ wSFBDU@PO@SBJMT w σϑΥϧτ͸&YFD+4͕ͩ1SP൛͸/PEF7.͕࢖͑ΔΒ͍͠

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&YFD+4 w3VCZ͔Β+4Λ࣮ߦ͢Δ wϥϯλΠϜ͍Ζ͍Ζ w MJCWܥ UIFSVCZSBDFS NJOJ@SBDFS w /PEFKT w FUD wศར͕͍ͩΖ͍Ζ੍ݶ͸͋Δ w +4&WFOUMPPQʹ׬શʹ͸ରԠ͓ͯ͠ΒͣɺTFU5JNFPVUͱ͔࢖͑ͳ͍

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SFBDUSBJMT w3BJMT XFCQBDLFS Ͱ3FBDU࢖͏ͳΒͨͿΜ͔͜͜Β w SBJMTXFCQBDLFSJOTUBMMͰೖΔ w Φ΢νʔϊͰ΋࠷ॳ͜ΕΛ࢖͍ͬͯͨ w443͕؆୯ w ΦϓγϣϯΛQSFSFOEFSUSVFʹ͢Δ͚ͩʂ w ૣ଎༗ޮʹͯ͠Έͨ

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େྔͷΤϥʔͰશવಈ͔ͳ͍ w&YFD+4ଆͰϒϥ΢βݻ༗ͷ΋ͷʹ৮Δͱଈࢮ w XJOEPX MPDBM4UPSBHF FUD w UZQFPGXJOEPXͳͲ੍ͯ͠ޚͯ͠΍Δඞཁ͕͋Δ w6OJWFSTBM+BWB4DSJQUԽ w ϒϥ΢βͰ͔͠ಈ͔ͳ͍࣮૷Λ͠ͳ͍Α͏मਖ਼ w Ͱ΋ϝσΟΞΫΤϦͱ͔MPDBM4UPSBHF࢖͍͍ͨɾɾɾ

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؀ڥґଘͷίʔυΛந৅Խ class DeviceDetector { constructor(userAgent) { // CSRではメディアクエリ、SSRではUAを使う if ((typeof window) === 'undefined') { this.detector = new UADetector(userAgent) } else { this.detector = new MediaDetector() } } } // メインコードでは環境を意識せずに使う deviceDetector = new DeviceDetector(this.props.user_agent) if (deviceDetector.isSmartPhone()) { ... }

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)5.-ฦͬͯ͘ΔΑ͏ʹͳͬͨ wҰ෦ͷίϯςϯπ͕දࣔ͞Εͳ͍ w "1*ͰσʔλΛऔಘͯ͘͠Δ෦෼ w Ͳ͏΍ΒSFEVYTBHB͕࣮ߦ͞Ε͍ͯͳ͍

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SFEVYTBHB w3FEVYͰඇಉظॲཧΛѻ͏NJEEMFXBSF class EstateComponent extends React.Component { handleClick() { // Reducerのときと同じようにdispatch dispatch({ type: 'REQUEST_FIND_ESTATE', params: { this.props.estateId } }) } } function* estateSaga() { yield takeEvery('REQUEST_FIND_ESTATE', fetchEstate) } function* fetchEstate(action) { try { const estate = yield call(API.fetchEstate, action.params.estateId) // 結果をreducerにdispatch yield put({ type: 'SUCCESS_FIND_ESTATE', estate }) } catch (e) { yield put({ type: 'FAILURE_FIND_ESTATE', message: e.message }) } }

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$43ͰͷTBHB ϒϥ΢β 3FBDU 4BHB 4BHBTUBSU SFOEFS EJTQBUDI "1*GFUDI 5BLFBDUJPO EJTQBUDI 3FEVDFS 6QEBUFDPNQPOFOU ֓೦ͱͯ͠͸ ผʑͷεϨουͰ ಈ͘Πϝʔδ SFOEFS࣌ ൃߦ͞ΕͨBDUJPO܈Λ TBHB͕रͬͯ EJTQBUDIͯ͠໭͢

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ͦͷ··443͢Δͱ &YFD+4 3FBDU 4BHB 4BHBTUBSU SFOEFS EJTQBUDI 4BHB͕ಈ͘લʹSFOEFS ؔ਺͕ऴྃ͢Δ 3BJMT 4BHB͕ಈ͔ͳ͍ঢ়ଶͰ ͷIUNMΛฦͯ͠͠·͏

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ճSFOEFS͢Δ 3FBDU 4BHB SFOEFS EJTQBUDI "1*GFUDI 5BLFBDUJPO EJTQBUDI 3FEVDFS &/%BDUJPO͸ ࣮ߦதͷTBHBλεΫ͕ ऴྃͨ͠ΒTBHB΋ऴྃ &/%EJTQBUDI 4BHBTUPQ 3FEVYTUPSF 3FBDU SFOEFS 3BJMT ॳճSFOEFSͨ͠Β &/%EJTQBUDI ̍ճ໨ͷ TUPSFΛ࢖ͬͯ ࠶౓SFOEFS

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TBHBͷ443ํ๏ʢެࣜʣ store.runSaga(rootSaga).toPromise().then(() => { // sagaが終了したらrenderして返すコールバック res.status(200).send( layout( renderToString(rootComp), JSON.stringify(store.getState()) ) ) }).catch((e) => { res.status(500).send(e.message) }) renderToString(rootComp) // 1回目のrender store.close() // END actionをdispatch

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ճSFOEFS๏ͷ໰୊ wϨεϙϯεฦ͢ਓ͕1SPNJTFΛѻ͑Δ ඞཁ͕͋Δ w ެࣜαϯϓϧ͸/PEFKT w &YFD+4ˠ3BJMTͷ৔߹͸ίʔϧόοΫΛ଴ͯͳ͍

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)ZQFSOPWB w"JSCOC੡443πʔϧ 3BJMT )ZQFSOPWB /PEFKT SFOEFS SFOEFS3FBDU .FSHF )ZQFSOPWB͔Βͷ )5.-Λ3BJMTςϯϓϨʔ τจࣈྻʹૠೖ 1SPNJTFͰฦͤ͹ ίʔϧόοΫͷ݁ՌΛ ฦͯ͘͠ΕΔ

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)ZQFSOPWBͰTBHB΋ಈ͘Α͏ʹͳ͕ͬͨɾɾɾ w·ͩ෦෼తʹදࣔ͞Εͳ͍ w TBHBλεΫͷ݁ՌͰผͷTBHBλεΫ͕ಈ͘Օॴ w&/%BDUJPO͸ͦͷ࣌఺ͰͷλεΫͷ׬ྃΛ଴ͭ w &/%EJTQBUDIޙʹ৽͘͠ൃߦ͞ΕͨBDUJPO͸଴ͨͳ͍ wͱΓ͋͑ͣ֘౰λεΫ͸Ұͭʹ·ͱΊͯճආ w ૄ݁߹ੑΣɾɾɾ

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ίϯςϯπ͸443Ͱ͖ΔΑ͏ʹͳͬͨʂ wUJUMFλά͕ग़ͳ͍ɾɾɾ

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3FBDUIFBE +49Ͱهड़͓͚ͯ͠͹ ·ͱΊͯIFBEΛ࡞ͬͯ ͘ΕΔ const App = () => (

Title of page // ...

)

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3FBDUIFBEͷ443 BU/PEFKT const headTags = []; const app = renderToString( ); res.send(` ${renderToString(headTags)}

${app}

`); SFOEFS͢Δͱ IFBE5BHTʹ IFBE༻ίϯϙʔω ϯτ͕ूΊΒΕΔ IFBE5BHT͚ͩΛ ࠶౓SFOEFSͯ͠ ϨΠΞ΢τʹຒΊ ࠐΉ

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)ZQFSOPWB͸EJWλάͷத਎͚ͩΛฦ͢ !!! %html %head %meta{:content => "text/html; charset=UTF-8"... ... %body ... = render_react_component('app', react_props) ϨΠΞ΢τ͸ 3BJMTଆʹ͋Δ IZQFSOPWBSVCZ͕ IZQFSOPWBTFSWFS ͔Βฦ͖ͬͯͨIUNM ยͰஔ׵

...

SFBDUIFBEͰ ผ్SFOEFSͨ͠΋ͷΛ Ͳ͏΍ͬͯ3BJMTଆʹ౉͢ʁ

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Ұॹʹฦͯ͠ஔ׵ʢྗٕʣ !!! %html %head %meta{:content => "text/html; charset=UTF-8"... ... %hypernova-head-tags/ %body ... = render_react_component('app', react_props) SFBDUIFBEʹSFOEFSͤ͞ ͨ΋ͷΛಠࣗλάͰҰॹ ʹฦ͢ IZQFSOPWBSVCZ͕ ஔ׵ͨ͠ޙʹ ϚʔΧʔλάΛஔ׵ ...

...

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͍͍ͩͨ443Ͱ͖ͨʂࣾ಺Ͱ৮ͬͯ΋Β͏ wදࣔ͸Ͱ͖ͯΔ͚Ͳಈ͖͕͓͔͍͠ w ݕࡧͨ͜͠ͱͳ͍৔ॴͷ݁Ռ͕ग़ͯ͘Δ

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άϩʔόϧม਺ʹͳͬͯͨ wΫϥε֎ͷม਺ͳͲ w $43Ͱ͔͠ಈ͍͍ͯͳ͔ͬͨͷͰ໰୊ͳ͔ͬͨ wҰͭҰͭ௚ͨ͠

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443ϦϦʔεʂ

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ΠϯσοΫε ͞Εͳ͔ͬͨɾɾɾ

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΋͔ͯ͠͠දࣔ଎౓ɾɾɾʁ wUFTUNZTJUF w (ճઢͰඵ͔͔Δͱ͍͏ධՁ wੵΈ*TTVFʹ͍ͯͨ͠ w ࣮ճઢͰ࢖͍ͬͯΔݶΓ͸ͦ͜·Ͱ஗͘ײ͍ͯ͡ͳ͔ͬͨ w શମ੾Γସ͑લʹ͸ͪΌΜͱ΍Ζ͏ͱࢥ͍ͬͯͨ

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ϘτϧωοΫ w+BWB4DSJQUϑΝΠϧͷμ΢ϯϩʔυ࣌ؒ w ϑΝΠϧͰ.Φʔόʔ w XFCQBDLͰ͢΂͕ͯόϯυϧ͞ΕͨϑΝΠϧʹͳΔͨΊ w 443͍ͯ͠Δͷʹ+4ϑΝΠϧ͕ϘτϧωοΫʁ w 3FBDUIZESBUF׬ྃ·Ͱ͸%0.$POUFOU-PBEFEʹͳΒͳ͍ ʢৄࡉ͸ޙड़ʣ

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$PEF4QMJUUJOH w7FOEPS$PEF4QMJUUJOH w%ZOBNJD*NQPSUT ·ͣ͸͔ͬͪ͜Β

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7FOEPS$PEF4QMJUUJOH wࢦఆͨ͠ϞδϡʔϧΛผϑΝΠϧʹ੾Γग़͢ w XFCQBDLDPOpHʹϧʔϧϕʔεͰઃఆ͢Δ wQSPTDPOT w ࣮૷Λมߋ͢Δඞཁ͕ͳ͍ w ϧʔϧ͕૿͑ΔͱΧΦε w ෼ׂͰ͖Δཻ౓͕ߥ͍

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$PNNPOT$IVOL1MVHJO w$PEFTQMJUUJOH༻ͷXFCQBDLQMVHJO w XFCQBDLWͰ͸4QMJU$IVOLT1MVHJOʹͳ͍ͬͯΔ w XFCQBDLFSͰ͸QSFͰXFCQBDLWରԠ w ౰࣌XFCQBDLFS͸WʹରԠ͍ͯ͠ͳ͔ͬͨ w ෳ਺ͷϧʔϧΛఆٛ͢Δ৔߹෼͔ΓͮΒ͍

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$PNNPOT$IVOL1MVHJO clientPlugins.push( new webpack.optimize.CommonsChunkPlugin({ name: 'vendor', minChunks: (m) => /node_modules/.test(m.context) }), ); clientPlugins.push( new webpack.optimize.CommonsChunkPlugin({ name: 'd3_chunk', minChunks: (m) => /node_modules\/(?:d3|redux)/.test(m.context) }), ); clientPlugins.push( new webpack.optimize.CommonsChunkPlugin({ name: 'redux_chunk', minChunks: (m) => /node_modules\/(?:redux)/.test(m.context) }), ); ໊લϕʔεͰϚον ޷͖ͳཻ౓Ͱ DIVOLʹͰ͖Δɺ͕ Ϛονͷ฼ूஂ͕ લճͷϚονର৅ͳͷͰ ্ྲྀ͸ԼྲྀΛશؚͯΉ

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#VOEMF"OBMZ[FS1MVHJO $PNNPOT$IVOL1MVHJO ϧʔϧΛௐ੔ͯ͠ ࠷େͰ΋,ʹऩ·Δ Α͏ʹௐ੔

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ͪΐͬͱ଎͘ͳͬͨ TT

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ΠϯσοΫε ͞Ε࢝Ίͨʂʂʂ

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ͲΜͲΜ෼ׂ

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XFCQBDLDPOpHͷ෼཭ w$43༻ͱ443༻ͰDPOpHΛ෼཭ w $PEFTQMJUUJOH͕ඞཁͳͷ͸$43͚ͩ w 443࣌͸DIVOL͕Θ͔Ε͍ͯΔͱNBOJGFTU͔ΒEJHFTUͷղܾ΋͢Δඞཁ ͕͋Δ w ͦ΋ͦ΋෼͚ΔϝϦοτ͕͋·Γແ͍ w 6OJWFSTBM+4͕΍Γ΍͘͢ͳΔ w ͨͩBTTFUDPNQJMFͷ࣌ؒ͸৳ͼΔɾɾɾ

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7FOEPS$PEF4QMJUUJOHͷน wґଘؔ܎͸อূ͞Εͳ͍ w BTZODMPBEͰ͖ͳ͍ w ແཧ΍Γ෼ׂ͢ΔͱյΕΔ wDIVOL͸ϥΠϒϥϦͷαΠζΑΓখ͘͞Ͱ͖ͳ͍ w ར༻͍ͯ͠ͳ͍ͱ͜Ζ΋όϯυϧ͞Εͯ͠·͏ wDIVOL෼ׂ͕৬ਓܳԽ

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$PEF4QMJUUJOH w7FOEPS$PEF4QMJUUJOH w%ZOBNJD*NQPSUT ΍ͬͺΓ͔ͬͪ͜

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%ZOBNJD*NQPSUT import(/* webpackChunkName: "raven" */ 'raven-js').then((Raven) => { Raven.config( 'endpoint', { environment: this.props.railsEnv, release: this.props.revision } ).install() })

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%ZOBNJD*NQPSUT wQSPTDPOT w ґଘੑΛߟྀͰ͖Δ w ͖Ίࡉ΍͔ʹ෼ׂ͠΍͍͢ w EZOBNJDJNQPSUTΛߟྀ࣮ͨ͠૷͕ඞཁ w ର৅ΛҰՕॴͰ΋௨ৗJNQPSU͢Δͱ෼ׂ͞Εͳ͍ w ίʔϧόοΫ੍ޚͭͭ͠ίϯϙʔωϯτߏங͢ΔͭΒΈ

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SFBDUMPBEBCMF w3FBDUίϯϙʔωϯτΛEZOBNJDJNQPSUT ʹͯ͘͠ΕΔ)0$ϥΠϒϥϦ import Loadable from 'react-loadable' const Lightbox = Loadable({ loader: () => import(/* webpackChunkName: "react-images" */ 'react-images'), loading() { return

} }) ˞MPBEBCMFDPNQPOFOUTͱ͔΋Αͦ͞͏

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SFBDUMPBEBCMF wQSPTDPOT w ίϯϙʔωϯτΛ؆୯ʹEZOBNJDJNQPSUTʹͰ͖Δ w ͢Ͱʹ)0$ʹͳ͍ͬͯΔ΋ͷͱ૬ੑ͕ѱ͔ͬͨΓ͢Δ w 6*ܥʹద༻͢Δͱ͔ͤͬ͘443Ͱදࣔ͞ΕͯΔͷʹޙ͔ ΒҰॠ-PBEJOHʹͳͬͨΓ w ґଘؔ܎͕ෳࡶͳίϯϙʔωϯτͰΧΦεʹͳΓ΍͍͢

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݁ہ๚ΕΔίʔϧόοΫ஍ࠈ wBXBJUͰ੍ޚ͍ͨ͠ w ݸผʹBTZODGVODUJPOʹͰ͖Δͱ͜Ζ͸ྑ͍ w IZQFSOPWB͔ΒHFU$PNQPOFOU͞ΕͯCVJME͍ͯ͠ ͘Ͳ͔͜ͰٵऩͰ͖ͨΒɾɾɾΜʁ

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