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TypeScriptを振り回せ!

uhyo
December 17, 2021

 TypeScriptを振り回せ!

2021-12-17 Harajuku.ts Meetup #1

uhyo

December 17, 2021
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  1. 5ZQF4DSJQUΛৼΓճͤʂ
    VIZP
    )BSBKVLVUT

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  2. ֓ཁ
    5ZQF4DSJQUʹৼΓճ͞Ε͍ͯ·ͤΜ͔ʁ
    ʮܕ͸Α͘෼͔Βͳ͍͚ͲͱΓ͋͑ͣίϯύΠϧ௨͔ͬͨΒ0,ʯ
    ʮ5ZQF4DSJQU͕͋ΔԸܙΛ͋·Γײ͡ͳ͍ʯ
    ʮϩδοΫతʹOVMM͕དྷͳ͍৔ॴͳͷʹܕʹOVMM͕࢒͍ͬͯΔʯ
    ʮؔ਺ͷฦΓ஋͕BOZͰ΋ίϯύΠϧΤϥʔʹ
    ͳΒͳ͍ͷͰؾʹ͠ͳ͍ʯ

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  3. ֓ཁ
    5ZQF4DSJQUΛ࢖͍͜ͳ͢ஈ֊΁εςοϓΞοϓ͠Α͏
    5ZQF4DSJQUॳֶऀɾॳΊͯϓϩμΫγϣϯ޲͚5ZQF4DSJQU
    Λॻ͘ਓͳͲʹଃΔτʔΫ

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  4. ܕγεςϜͷ໾ׂͱ໨త

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  5. ܕγεςϜͷ໾ׂʢҰൠ࿦ʣ
    ܕݕࠪ
    ೖྗࢧԉ
    ίʔυੜ੒
    ਖ਼͕͠͞ূ໌Ͱ͖ͳ͍ϓϩάϥϜʹରͯ͠
    ίϯύΠϧΤϥʔΛग़ͯ͘͠ΕΔ
    ܕ৘ใΛ΋ͱʹೖྗิ׬ͳͲΛఏڙͯ͘͠ΕΔ
    ܕ৘ใΛ΋ͱʹίϯύΠϧޙͷϝϞϦϨΠΞ΢τ
    ͳͲ͕ܾ·Δ
    ʢi64͸ϏοτΈ͍ͨͳʣ

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  6. ܕγεςϜͷ໨తʢҰൠ࿦ʣ
    ܕݕࠪ
    ೖྗࢧԉ
    ίʔυੜ੒
    ਖ਼͕͠͞ূ໌Ͱ͖ͳ͍ϓϩάϥϜʹରͯ͠
    ίϯύΠϧΤϥʔΛग़ͯ͘͠ΕΔ
    ϓϩάϥϜͷʢ͋Δछͷʣਖ਼͠͞Λอূ͢ΔͨΊʹར༻
    ܕ৘ใΛ΋ͱʹೖྗิ׬ͳͲΛఏڙͯ͘͠ΕΔ
    ։ൃޮ཰ͷ޲্ͷͨΊʹར༻
    ܕ৘ใΛ΋ͱʹίϯύΠϧޙͷϝϞϦϨΠΞ΢τͳͲ
    ͕ܾ·Δ
    ͦ΋ͦ΋ίʔυΛίϯύΠϧͯ͠ಈ͔ͨ͢Ίʹඞཁ
    ʢ࣮ࡍʹ͸EZOBNJDUZQFʹର͢ΔCPYJOHͱ͔΋͋Δ͕ʜʜʣ

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  7. ܕγεςϜͷ໨తʢҰൠ࿦ʣ
    ίʔυੜ੒
    ܕ৘ใΛ΋ͱʹίϯύΠϧޙͷϝϞϦϨΠΞ΢τͳͲ
    ͕ܾ·Δ
    ͦ΋ͦ΋ίʔυΛίϯύΠϧͯ͠ಈ͔ͨ͢Ίʹඞཁ
    ʢ࣮ࡍʹ͸EZOBNJDUZQFʹର͢ΔCPYJOHͱ͔΋͋Δ͕ʜʜʣ
    ίʔυੜ੒ʹܕ͕ඞཁͳݴޠͰ͸ͪΌΜͱܕΛ෇͚ͳ͍ͱ
    ϓϩάϥϜ͕ಈ͔ͳ͍
    ίϯύΠϧΛ௨͢͜ͱ͕ͻͱͭͷΰʔϧʹͳΔ

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  8. Ұํɺ5ZQF4DSJQUͰ͸
    ܕݕࠪ
    ೖྗࢧԉ
    ίʔυੜ੒
    ਖ਼͕͠͞ূ໌Ͱ͖ͳ͍ϓϩάϥϜʹରͯ͠
    ίϯύΠϧΤϥʔΛग़ͯ͘͠ΕΔ
    ϓϩάϥϜͷʢ͋Δछͷʣਖ਼͠͞Λอূ͢ΔͨΊʹར༻
    ܕ৘ใΛ΋ͱʹೖྗิ׬ͳͲΛఏڙͯ͘͠ΕΔ
    ։ൃޮ཰ͷ޲্ͷͨΊʹར༻
    5ZQF4DSJQUͰ͸+BWB4DSJQU΁ͷม׵ʢτϥϯεύΠϧʣ
    ʹܕ৘ใΛ༻͍ͳ͍
    ʢ͔ͩΒ#BCFM౳Ͱ΋ม׵Ͱ͖Δʣ

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  9. Ұํɺ5ZQF4DSJQUͰ͸
    ίʔυੜ੒
    5ZQF4DSJQUͰ͸+BWB4DSJQU΁ͷม׵ʢτϥϯεύΠϧʣ
    ʹܕ৘ใΛ༻͍ͳ͍
    ʢ͔ͩΒ#BCFM౳Ͱ΋ม׵Ͱ͖Δʣ
    ʮಈ͚͹͍͍ʯͱ͍͏ߟ͑ํͩͱͲ͜·Ͱ΋མͪΔ͜ͱ͕Ͱ͖Δ
    ʢ࠷ѱશ෦BOZͰ΋ಈ͘ʣ

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  10. Ұํɺ5ZQF4DSJQUͰ͸
    ܕݕࠪ
    ೖྗࢧԉ
    ਖ਼͕͠͞ূ໌Ͱ͖ͳ͍ϓϩάϥϜʹରͯ͠
    ίϯύΠϧΤϥʔΛग़ͯ͘͠ΕΔ
    ϓϩάϥϜͷʢ͋Δछͷʣਖ਼͠͞Λอূ͢ΔͨΊʹར༻
    ܕ৘ใΛ΋ͱʹೖྗิ׬ͳͲΛఏڙͯ͘͠ΕΔ
    ։ൃޮ཰ͷ޲্ͷͨΊʹར༻
    ϓϩάϥϜͷਖ਼͠͞Λ޲্͢Δͱ͍͏໨తҙ͕ࣝ
    5ZQF4DSJQUΛ࢖͏্Ͱॏཁ

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  11. 5ZQF4DSJQUͰܕγεςϜΛ׆༻͢Δ
    ϓϩάϥϜͷਖ਼͠͞Λ޲্͢Δͱ͍͏໨తҙ͕ࣝ
    5ZQF4DSJQUΛ࢖͏্Ͱॏཁ
    ඞཁ࠷௿ݶͷܕ͚ͩॻ͘ͷͰ͸ͳ͘ɺೳಈతʹܕΛ׆༻͢Δ
    ͜ͱͰ5ZQF4DSJQUͷྗΛҾ͖ग़͢͜ͱ͕Ͱ͖Δ

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  12. 5ZQF4DSJQUͰܕγεςϜΛ׆༻͢Δ
    2ೳಈతʹܕΛ׆༻͢ΔͨΊʹඞཁͳ΋ͷ͸ʁ

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  13. 5ZQF4DSJQUͰܕγεςϜΛ׆༻͢Δ
    2ೳಈతʹܕΛ׆༻͢ΔͨΊʹඞཁͳ΋ͷ͸ʁ
    "΍Δؾͱ୳ڀ৺ͱ஌ࣝ

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  14. ܕΛ׆༻͢ΔͨΊʹඞཁͳ
    ΍Δؾͱ୳ڀ৺ͱ஌ࣝ

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  15. ྫTUSJDU/VMM$IFDLTΛ๨Ε͍ͯͨʂ
    // TypeScript + React ͷྫ
    // string ܕͷεςʔτͳͷʹॳظ஋Λnullʹ͍ͯ͠Δʂ
    const [name, setName] = useState(null);

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  16. ྫTUSJDU/VMM$IFDLTΛ๨Ε͍ͯͨʂ
    // TypeScript + React ͷྫ
    // string ܕͷεςʔτͳͷʹॳظ஋Λnullʹ͍ͯ͠Δʂ
    const [name, setName] = useState(null);
    TUSJDUUSVFʹ͠ͳ͍ͱίϯύΠϧ͕௨ͬͯ͠·͏
    ม਺OBNF͸TUSJOHܕͳͷʹOVMM͕ೖ͍ͬͯΔঢ়ଶʹͳΔ
    ίʔυͷ҆શੑ͕௿͍ঢ়ଶ
    ˒ ίϯύΠϥΦϓγϣϯ͸ͳΔ΂͘ݫͯ͘͠͠5ZQF4DSJQUͷԸܙΛΑΓଟ͘ड͚Α͏ʂ

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  17. ஌ࣝͰ໰୊Λղܾ͢ΔγφϦΦ
    // TypeScript + React ͷྫ
    // string ܕͷεςʔτͳͷʹॳظ஋Λnullʹ͍ͯ͠Δʂ
    const [name, setName] = useState(null);
    5ZQF4DSJQU͸OVMM҆શੑΛඋ͑ͨݴޠͰ͋Δͱ͍͏஌ࣝΛ͍࣋ͬͯΔ
    ࠓճOVMM҆શੑ͕ಇ͍͍ͯͳ͍͜ͱʹٙ໰Λ๊͘
    TUSJDU/VMM$IFDLT͕ແޮʹͳ͍ͬͯΔ͜ͱʹؾͮ͘

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  18. ΍Δؾͱ୳ڀ৺Ͱ໰୊Λղܾ͢ΔγφϦΦ
    // TypeScript + React ͷྫ
    // string ܕͷεςʔτͳͷʹॳظ஋Λnullʹ͍ͯ͠Δʂ
    const [name, setName] = useState(null);
    TUSJOHܕͳͷʹOVMMͷՄೳੑ͕͋Δͱ͔͓͔͍͠ʂ
    ΋ͬͱ҆શੑΛߴΊΔ΍Γํ͕͋ΔͷͰ͸ʁʢ΍Δؾʣ
    άάΔʢ୳ڀ৺ʣ
    TUSJDU/VMM$IFDLT͕ແޮʹͳ͍ͬͯΔ͜ͱʹؾͮ͘

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  19. 5ZQF4DSJQUΛ࢖͍͜ͳͨ͢Ίͷͭͷಓے
    ᶃ ͱʹ͔͘஌ࣝΛ͚ͭͯϕετϓϥΫςΟεΛ࣮ફ͢Δ
    ᶄ ৗʹݱঢ়ʹٙ໰Λ࣋ͪ͞Βʹ༏Εͨ΍ΓํΛ୳ٻ͢Δ

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  20. 5ZQF4DSJQUΛ࢖͍͜ͳͨ͢Ίͷͭͷಓے
    ᶃ ͱʹ͔͘஌ࣝΛ͚ͭͯϕετϓϥΫςΟεΛ࣮ફ͢Δ
    ᶄ ৗʹݱঢ়ʹٙ໰Λ࣋ͪ͞Βʹ༏Εͨ΍ΓํΛ୳ٻ͢Δ
    ͓͢͢Ί
    –΍Δؾ͕͋Ε͹஌͕ࣝͳͯ͘΋Ͱ͖Δ
    –lಈ͘z͜ͱ͕ελʔτ஍఺ͳ5ZQF4DSJQUͱ૬ੑ͕ྑ͍΍Γํ
    –ݶք·Ͱ౸ୡ͢Ε͹ᶃʹҠߦͰ͖Δ

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  21. ྫλϒΛ੾Γସ͑Δ΍ͭ
    // TypeScript + React ͷྫ
    const [tab, setTab] = useState(“home”);

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  22. ྫλϒΛ੾Γସ͑Δ΍ͭ
    // TypeScript + React ͷྫ
    const [tab, setTab] = useState(“home”);
    // λϒ੾Γସ͑
    setTab(“home”);
    setTab(“search”);
    // ίϯςϯπΛදࣔ
    switch (tab) {
    case “home”:
    return ;
    case “search”:
    return ;
    default:
    // ൃੜ͠ͳ͍
    return null;
    }

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  23. ྫλϒΛ੾Γସ͑Δ΍ͭ
    // TypeScript + React ͷྫ
    const [tab, setTab] = useState(“home”);
    // λϒ੾Γସ͑
    setTab(“home”);
    setTab(“search”);
    ໰୊఺
    ϛε͠΍͍͢
    setTab(“serach”);
    ൃੜ͠ͳ͍෼ذΛॻ͍͍ͯΔ
    // ίϯςϯπΛදࣔ
    switch (tab) {
    case “home”:
    return ;
    case “search”:
    return ;
    default:
    // ൃੜ͠ͳ͍
    return null;
    }

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  24. 5ZQF4DSJQU࢖༻࣌ʹ͓͢͢Ίͷߟ͑ํ
    ʮਓ͕ؒؾΛ͚ͭͳ͚Ε͹ͳΒͳ͍ʯ
    ͱ͍͏৔໘ʹग़ձͬͨΒٙ໰ʹࢥ͏
    5ZQF4DSJQUʹνΣοΫͯ͠΋Β͑ͳ͍͔ߟ͑Δ
    –΋ͪΖΜ5ZQF4DSJQUʹ΋ݶք͸͋ΔͷͰແཧͳ͜ͱ΋͋Δ͕ɺ
    ͦΕͰ΋ߟ͑Δ͜ͱͰ5ZQF4DSJQUͷྗ͕෇͖·͢
    –Ϣχοτςετͷํ͕ద͍ͯ͠Δ৔߹΋͋Δ͕ɺͦΕΛݟ෼͚Δ
    ͷ΋5ZQF4DSJQUྗͷ͏ͪͰ͢

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  25. ྫλϒΛ੾Γସ͑Δ΍ͭʢղܾฤʣ
    type Tab = “home” | “search”;
    const [tab, setTab] = useState(“home”);
    // λϒ੾Γସ͑
    setTab(“home”);
    setTab(“search”);
    // ίϯςϯπΛදࣔ
    switch (tab) {
    case “home”:
    return ;
    case “search”:
    return ;
    // default:
    // // ൃੜ͠ͳ͍
    // return null;
    }

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  26. ྫλϒΛ੾Γସ͑Δ΍ͭʢղܾฤʣ
    type Tab = “home” | “search”;
    const [tab, setTab] = useState(“home”);
    // λϒ੾Γସ͑
    setTab(“home”);
    setTab(“search”);
    UZQP͸ίϯύΠϧΤϥʔʹʂ
    setTab(“serach”);
    ൃੜ͠ͳ͍෼ذ͸ॻ͘ඞཁ͕ͳ͍
    // ίϯςϯπΛදࣔ
    switch (tab) {
    case “home”:
    return ;
    case “search”:
    return ;
    // default:
    // // ൃੜ͠ͳ͍
    // return null;
    }

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  27. ίʔυʹҙਤΛࠐΊΑ͏

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  28. ྑ͍ίʔυ͸ҙਤ͕Θ͔Δ
    Ұൠ࿦
    –ྑ͍ίʔυ͸ಡΊ͹ҙਤ͕Θ͔Δ
    –ίϝϯτ͸ίʔυຊମ͔ΒಡΈऔΕͳ͍ҙਤΛ
    ิ͏΋ͷͰ͋Δ
    –ͨͩಈ͚ͩ͘ͷίʔυΑΓ΋ɺଞͷਓ͕ಡΜͰ
    ҙਤΛཧղ͠΍͍͢ίʔυΛॻ͘΂͖

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  29. ίʔυ͔ΒಡΈऔΒΕΔҙਤͷྫ
    const [tab, setTab] = useState(“home”);
    // ίϯςϯπΛදࣔ
    switch (tab) {
    case “home”:
    return ;
    case “search”:
    return ;
    default:
    return null;
    }
    TUSJOHͳͷͰ͋ΒΏΔจࣈྻ
    Λड͚ೖΕΔTUBUFͰ͋Δ
    IPNF TFBSDIҎ֎͸Կ΋දࣔ
    ͠ͳ͍ͱ͍͏࢓༷Ͱ͋Δ

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  30. ࣮ࡍͷҙਤ
    const [tab, setTab] = useState(“home”);
    // ίϯςϯπΛදࣔ
    switch (tab) {
    case “home”:
    return ;
    case “search”:
    return ;
    default:
    return null;
    }
    TUSJOHͳͷͰ͋ΒΏΔจࣈྻ
    Λड͚ೖΕΔTUBUFͰ͋Δ
    IPNF TFBSDIҎ֎͸Կ΋දࣔ
    ͠ͳ͍ͱ͍͏࢓༷Ͱ͋Δ
    ಛఆͷจࣈྻ͔͠ೖΒͳ͍
    ͚ͲTUSJOHͱॻ͍͍ͯΔ
    ࣮ࡍʹ͸ൃੜ͠ͳ͍έʔε͚ͩͲԿ͔ฦ͞ͳ
    ͍ͱίϯύΠϧΤϥʔʹͳΔͷͰॻ͍͍ͯΔ

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  31. ࣮ࡍͷҙਤ
    const [tab, setTab] = useState(“home”);
    // ίϯςϯπΛදࣔ
    switch (tab) {
    case “home”:
    return ;
    case “search”:
    return ;
    default:
    // ൃੜ͠ͳ͍
    return null;
    }
    ίʔυ͔ΒಡΈऔΕͳ͍ҙਤΛ
    ิ͏ίϝϯτ

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  32. վྑ͞Εͨίʔυ͔Β఻ΘΔҙਤ
    type Tab = “home” | “search”;
    const [tab, setTab] = useState(“home”);
    // ίϯςϯπΛදࣔ
    switch (tab) {
    case “home”:
    return ;
    case “search”:
    return ;
    }
    ಛఆͷจࣈྻ͔͠ड͚෇͚
    ͳ͍͜ͱ͕໌ࣔ͞Ε͍ͯΔ
    EFGBVMU͕ແ͍͜ͱͰ
    ໢ཏੑΛΞϐʔϧ
    ʢEFGBVMU͕ແ͍ͷʹίϯύΠϧΤϥʔ͕ग़ͳ͍͜ͱ͔ΒܕͰ໢ཏੑ͕อূ͞Ε͍ͯΔͱཧղͰ͖Δʣ

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  33. ྑ͍5ZQF4DSJQUίʔυͱ͸
    ࣮ࡍͷҙਤͱίʔυ͔ΒಡΈऔΒΕΔҙਤ͕
    Ұக͍ͯ͠Δίʔυ
    – औΓಘΔ஋Λਖ਼֬ʹهड़ͨ͠ܕΛ࢖͏ ʢstringͰ͸ͳ͘TabͳͲʣ
    – ࠷େݶMFUͰ͸ͳ͘DPOTUΛ࢖͏
    – SFBEPOMZΛͳΔ΂͘෇͚Δ
    – ؔ਺ͷฦΓ஋ͷܕΛ໌ه͢΂͖৔໘Ͱ͸໌ه͢Δ
    – ͳͲͳͲʜ

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  34. ྫແ͍͔΋͠Εͳ͍σʔλ
    type Session = {
    userId: string | null;
    userName: string | null;
    userRole: “ADMIN” | “MEMBER” | null;
    // …
    };
    ͋Γ͕ͪͳσʔλߏ଄ɿ
    ϩάΠϯ͍ͯͨ͠ΒVTFS*E VTFS/BNF VTFS3PMF͕શ෦ଘࡏ͢Δ

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  35. ྫແ͍͔΋͠Εͳ͍σʔλ
    // ϩάΠϯલ
    {
    userId: null,
    userName: null,
    userRole: null,
    }
    ͋Γ͕ͪͳσʔλߏ଄ɿ
    ϩάΠϯ͍ͯͨ͠ΒVTFS*E VTFS/BNF VTFS3PMF͕શ෦ଘࡏ͢Δ
    // ϩάΠϯޙ
    {
    userId: “xxxxxxxx”,
    userName: “uhyo”,
    userRole: “MEMBER”,
    }

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  36. ྫແ͍͔΋͠Εͳ͍σʔλ
    // ϩάΠϯલ
    {
    userId: null,
    userName: null,
    userRole: null,
    }
    ͋Γ͕ͪͳσʔλߏ଄ɿ
    ϩάΠϯ͍ͯͨ͠ΒVTFS*E VTFS/BNF VTFS3PMF͕શ෦ଘࡏ͢Δ
    // ϩάΠϯޙ
    {
    userId: “xxxxxxxx”,
    userName: “uhyo”,
    userRole: “MEMBER”,
    }
    "
    /
    5
    *1"
    5
    5
    &3
    /

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  37. ྫແ͍͔΋͠Εͳ͍σʔλ
    // ͜Ε͸Կʁ
    {
    userId: null,
    userName: “uhyo”,
    userRole: null,
    }
    ໰୊఺ɿ
    ͜ͷΑ͏ͳσʔλͷଘࡏΛڐͯ͠͠·͏
    ʢຊདྷͷҙਤͱίʔυ͔Β఻ΘΔҙਤͷဃ཭ʣ

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  38. ྫແ͍͔΋͠Εͳ͍σʔλʢղܾฤʣ
    type Session = {
    user: {
    id: string;
    name: string;
    role: “ADMIN” | “MEMBER”;
    } | null;
    };
    ਖ਼͍͠σʔλߏ଄ɿ
    JE OBNF SPMF͸શ෦ଘࡏ͢Δ͔શ෦ଘࡏ͠ͳ͍͔ͷ୒

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  39. ྫͷϙΠϯτ
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  40. ͳΔ΂͘5ZQF4DSJQUΛ׆༻͢Δ
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  41. ͳΔ΂͘5ZQF4DSJQUΛ׆༻͢Δ
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  42. ͳΔ΂͘5ZQF4DSJQUΛ׆༻͢Δ
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  43. ·ͱΊ

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  44. ·ͱΊ5ZQF4DSJQUΛৼΓճͨ͢Ίʹ
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