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TypeScript ͷܕఆٛΛ
 13͢Δٕज़ ZQSFTUP:VZB5BOBLB
 LBOTBJUT Picture: Ron Clausen (CC-BY-SA 4.0) with trimming & color filter applied by ypresto
 ஫ɿͪΌΜͱTSͷαΠτͱಉ͡γΞτϧͷը૾Ͱ͢

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!ZVZB@QSFTUP !ZQSFTUP DPEF5BLUֶߍڭҭܥΤϯδχΞ ϑϧϦϞʔτอҭ࢜ࢿ֨ :VZB5BOBLB bit.ly/ypresto-d-ts

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ۀ຿࿈བྷɿϩΫʹφϨοδγΣΞ΋ͤͣ͢Έ·ͤΜͰͨ͠ɾɾ ͋ɺͰ΋͜ͷ2JJUBهࣄॻ͍ͯͨ ʢ࡟আ௒ա෼͸ZBSOMPDLʣ bit.ly/ypresto-d-ts

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"UMFBTU13T bit.ly/ypresto-d-ts

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ܕఆٛΛॻ͘ bit.ly/ypresto-d-ts

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߇͑Ί͕ա͗Δ P0ʢϥΠϒϥϦͷJNQPSUʹ͚ͩ༗ޮͳOP*NQMJDJU"OZ୭͔࡞͍ͬͯͩ͘͞ʂʂ

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ॳڃฤ

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தڃฤ

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˝

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্ڃฤ

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13Ͱ͖ΔܕΛ࡞Γ্͛Δ·Ͱ IUUQTHJUIVCDPNGOBOEPJOKT IUUQTHJUIVCDPN%FGJOJUFMZ5ZQFE%FGJOJUFMZ5ZQFEUSFF FDDECGFBBEECFUZQFTJOKT ʢ୹ॖˠIUUQCJUMZZQSFTUPEUJOKTʣ ˢ࡞ͬͯ13ͨ͠

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ܕ৘ใΛऩू͢Δʢਓྗʣ

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υΩϡϝϯτ͔Β αϯϓϧίʔυ͔Β ຊମͷίʔυ͔Β

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υΩϡϝϯτ͔Β

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αϯϓϧίʔυ͔Β

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αϯϓϧίʔυ͔Β υΩϡϝϯτ͔Β
 ੾Γग़ͯ͠ܕͷςετʹʂ

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ຊମͷίʔυ͔Β

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ຊମͷίʔυ͔Β ਖ਼͚֬ͩͲ
 ͿͬͪΌ͚େม
 ֬ೝ࣌ʹGood ͋ͱυΩϡϝϯτ͞Εͯͳ͍
 ύϥϝʔλ΋ݟ͔ͭΔʁ

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ܕఆٛͳΒͰ͸ͷ
 ͓࡞๏

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FYQPSU OBNFTQBDF ܕͷFYQPSU

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͜Ε͡ΌμϝͳΜʁ
 ⾣export defaultΛฒ΂ͯॻ͘ͱյΕΔϥΠϒϥϦ͕ଟ͍ ͜ͷॻ͖ํ͸ES ModulesͷϥΠϒϥϦઐ༻

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ʢesModuleInterop͕Φϑͷͱ͖ʣ
 ࣮ߦ࣌ʹTypeError ʮdayjs_1.default is undefinedʯ ྫɿexport =Ͱॻ͔Ε͍ͯΔdayjsͷ ܕఆٛΛexport defaultʹͯ͠ΈΔ ˢจݴ͸ద౰

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FYQPSU 54&4.PEVMFT $PNNPO+4 FYQPSUEFGBVMU'PP NPEVMFFYQPSUTEFGBVMU JNQPSU'PPGSPNGPP WBS'PPSFRVJSF GPP EFGBVMU FYQPSU'PP54ઐ༻ NPEVMFFYQPSUT JNQPSUBT'PPGSPNGPP JNQPSU'PPSFRVJSF GPP 54 WBS'PPSFRVJSF GPP FT.PEVMF*OUFSPQ͕0/ͷ৔߹ɺΑ͠ͳʹରԠ JNQPSU'PPGSPNGPP WBSGPPSFRVJSF GPP WBS'PPGPP͕&4.PEVMFT GPPEFGBVMUGPP

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FYQPSU 54&4.PEVMFT $PNNPO+4 FYQPSUEFGBVMU'PP NPEVMFFYQPSUTEFGBVMU JNQPSU'PPGSPNGPP WBS'PPSFRVJSF GPP EFGBVMU FYQPSU'PP54ઐ༻ NPEVMFFYQPSUT JNQPSUBT'PPGSPNGPP JNQPSU'PPSFRVJSF GPP 54 WBS'PPSFRVJSF GPP FT.PEVMF*OUFSPQ͕0/ͷ৔߹ɺΑ͠ͳʹରԠ JNQPSU'PPGSPNGPP WBSGPPSFRVJSF GPP WBS'PPGPP͕&4.PEVMFT GPPEFGBVMUGPP ݱ୅ɺଟ͘͸ͬͪ͜ͷ͸ͣ
 ʢbabelͯ͠Δ৔߹ͱ͔ʣ

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FYQPSU 54&4.PEVMFT $PNNPO+4 FYQPSUEFGBVMU'PP NPEVMFFYQPSUTEFGBVMU JNQPSU'PPGSPNGPP WBS'PPSFRVJSF GPP EFGBVMU FYQPSU'PP54ઐ༻ NPEVMFFYQPSUT JNQPSUBT'PPGSPNGPP JNQPSU'PPSFRVJSF GPP 54 WBS'PPSFRVJSF GPP FT.PEVMF*OUFSPQ͕0/ͷ৔߹ɺΑ͠ͳʹରԠ JNQPSU'PPGSPNGPP WBSGPPSFRVJSF GPP WBS'PPGPP͕&4.PEVMFT GPPEFGBVMUGPP NOTE: I18n.defaultLocale = 'ja' ͸ TSઐ༻requireͰॻ͔ͳ͍ͱͰ͖ͳ͍ ʢES Modules͸readonlyʣ

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FYQPSU 54&4.PEVMFT $PNNPO+4 FYQPSUEFGBVMU'PP NPEVMFFYQPSUTEFGBVMU JNQPSU'PPGSPNGPP WBS'PPSFRVJSF GPP EFGBVMU FYQPSU'PP54ઐ༻ NPEVMFFYQPSUT JNQPSUBT'PPGSPNGPP
 JNQPSU'PPSFRVJSF GPP 54 WBS'PPSFRVJSF GPP FT.PEVMF*OUFSPQ͕0/ͷ৔߹ɺΑ͠ͳʹରԠ JNQPSU'PPGSPNGPP WBSGPPSFRVJSF GPP WBS'PPGPP͕&4.PEVMFT GPPEFGBVMUGPP esModuleInterop͸ ࢖͍खͰONͱ͸ݶΒͳ͍

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FYQPSU OBNFTQBDF ܕͷFYQPSU

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OBNFTQBDF WBS*O\^10+0΍GVODUJPOΛ༻ҙ͠ NPEVMFTFYQPSUT*O·ΔͬͱFYQPSUʂ ϓϩύςΟࢗͯ͠

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dayjsؔ਺ΦϒδΣΫτʹ .locale() ΋ੜ͑ͯΔ ͦ͏ɺnamespaceͳΒͶ

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FYQPSU OBNFTQBDF ܕͷFYQPSU ͓લ͸ɹɹ
 ୭ͩʁ

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FYQPSUBTOBNFTQBDF ϒϥ΢β௚loadͰ΋࢖͑Δ UMDܗࣜͷ৔߹͸ॻ͘ʂ ྫɿ window.$ ͱ͔ i18n-jsͷίʔυ

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OBNFTQBDF FYQPSU ܕͷFYQPSU

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ܕͷFYQPSU &4.PEVMFTͰUPQMFWFMʢ͔EFDMBSFNPEVMF௚ԼʣʹܕΛॻ͘৔߹ɺ ෳࡶͳҾ਺΍ฦΓ஋ͳͲɺඞཁͳܕʹ͸FYQPSUΛʂ /05&FYQPSUͨ͠OBNFTQBDFͷதͷܕ͸উखʹݟ͑Δ໛༷

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ͦͷଞͷώϯτ ˔ ຊମʹ13͢Δͱ͖͸QBDLBHFKTPOʹUZQFTJOEFYEUTΛ௥Ճ ˔ %FGJOJUFMZ5ZQFEʹ13͢Δͱ͖͸$POUSJCVUJPOHVJEFΛಡΉ ˔ ෳ਺ϑΝΠϧͷϥΠϒϥϦ͸GPPCBSKTʹରԠͯ͠GPPCBSEUTΛ௥Ճ
 ⾣JNQPSUGSPNIPHFGPPCBSͨ͠ͱ͖ʹಡΜͰ͘ΕΔ ˔ ϞνϕΛอͭʹ͸ɿࣗ෼ͷϓϩδΣΫτͷ
 EFDMBSFNPEVMFͷதͰॻ͖࢝ΊͯɺޙͰ13ʹ͢Δ

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FAQʢʁʣ

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2৽͍͠ϥΠϒϥϦʹ
 ܕఆٛΛ͚ͭͯ ഑Γ͍ͨͷͰ͕͢ʁ

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"ྩ࿨࣌୅ͷϥΠϒϥϦ͸
 ࠷ॳ͔Β5ZQF4DSJQUͰ ॻ͖·͢ΑͶʁʁ

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·ͱΊ ܕఆٛΛॻ͘ʹ͸ υΩϡϝϯτ͔Βܕ৘ใΛ αϯϓϧίʔυ͔ΒܕͷςετΛ ຊମͷίʔυͰর߹Λ ܕఆٛͷ͓࡞๏ FYQPSUʹඞཁͳΒOBNFTQBDFΛ ࢖͏ FYQPSUΛॻ͖෼͚Δ 6.%͸FYQPSUBTOBNFTQBDF ܕ΋FYQPSUͯ͋͛͠Δ ܕͱ͸υΩϡϝϯτͰɺ ܕͱ͸ςετͩʂʂ

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ॻ͍ͯͳ͍ͱ͜Ζ͸جຊBOZͳͷͰɺଞͷPQUJPOͰΤϥʔʹͳΓʹ͍͘ʢଟ෼ ࣮ࡍ͸΁λϨͩͬͨͷͰTUSJDU/VMM$IFDLTͱOP*NQMJDJU5IJT͚͔ͩΒͰͨ͠ɾɾ ༨ஊɿTUSJDU͠·ͤΜ͔ʁ

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FYQPSU 54&4.PEVMFT $PNNPO+4 FYQPSUEFGBVMU'PP NPEVMFFYQPSUTEFGBVMU JNQPSU'PPGSPNGPP WBS'PPSFRVJSF GPP EFGBVMU FYQPSU'PP NPEVMFFYQPSUT'PP JNQPSU\'PP^GSPNGPP WBS'PPSFRVJSF GPP 'PP FYQPSU'PP54ઐ༻ NPEVMFFYQPSUT JNQPSUBT'PPGSPNGPP WBS'PPSFRVJSF GPP FT.PEVMF*OUFSPQ͕0/ͷ৔߹ɺΑ͠ͳʹରԠ JNQPSU'PPGSPNGPP WBSGPPSFRVJSF GPP WBS'PPGPP͕&4.PEVMFT GPPEFGBVMUGPP

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FYQPSU 54&4.PEVMFT $PNNPO+4 FYQPSUEFGBVMU'PP NPEVMFFYQPSUTEFGBVMU JNQPSU'PPGSPNGPP WBS'PPSFRVJSF GPP EFGBVMU FYQPSU'PP NPEVMFFYQPSUT'PP JNQPSU\'PP^GSPNGPP WBS'PPSFRVJSF GPP 'PP FYQPSU'PP54ઐ༻ NPEVMFFYQPSUT JNQPSUBT'PPGSPNGPP WBS'PPSFRVJSF GPP FT.PEVMF*OUFSPQ͕0/ͷ৔߹ɺΑ͠ͳʹରԠ JNQPSU'PPGSPNGPP WBSGPPSFRVJSF GPP WBS'PPGPP͕&4.PEVMFT GPPEFGBVMUGPP import * as React from 'react' ▼ import React from 'react' import React, { useState } from 'react'

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FYQPSU %FGJOJUFMZ5ZQFEΑΓMPEBTILFZ#ZEUT %FGJOJUFMZ5ZQFEΑΓMPEBTIFTLFZ#ZEUT