TypeScriptは10年でこんなに進化しました / TechFeed Experts Night 11

2023/1/18に発表した資料です。

Transcript

1. 5ZQF4DSJQU͸
   ೥Ͱ͜ΜͳʹਐԽ͠·
   ͨ͠
   +BO 5FDI'FFE&YQFSUT/JHIU+BWB4DSJQU5ZQF4DSJQU࠷લઢ
   !PLVOPLFOUBSP
   

   View Slide

2. ୭
   w Ԟ໺ݡଠ࿠!PLVOPLFOUBSP
   w ΫϨε΢ΣΞגࣜձࣾ
   w 5ZQF4DSJQUྺ೥
   w ϑϩϯ
   τΤϯ
   υ
   ɾ
   όοΫΤϯ
   υ
   

   View Slide

3. 5ZQF4DSJQU͸ࡀ
   w 5ZQF4DSJQU͸೥݄೔ੜ·Ε
   w ʹύϒϦ
   οΫͱͳΔ
   w ʹͯϑΟ
   ʔ
   υόοΫΛ΋ͱʹվྑ͠Λ໨ࢦ͢
   w Array͕ArrayʹͳΔ
   w ೥݄೔ʹ͕Ϧ
   Ϧʔε
   

   View Slide

4. 5ZQF4DSJQUY
   
   w %F
   fi
   OJUFMZ5ZQFE
   ʢ༗ࢤίϛϡχςΟʣ
   ʹͯ
   

   ࣍ʑ
   ͱ+4ϥΠ
   ϒϥ
   Ϧ༻ͷܕఆٛϑΝΠϧ(.d.ts)͕࡞੒͞ΕΔ
   w OQNͰ؅ཧ͞Ε͍ͯͳ͍࣌୅
   w ܕఆٛґଘղܾπʔϧͱ͍͏ͷ͕ผʹ͋ͬͨ
   

   View Slide

5. 5ZQF4DSJQUY
   
   w %F
   fi
   OJUFMZ5ZQFEͷܕఆٛϑΝΠϧ͕OQNʹͯ؅ཧ͞ΕΔ
   w ͍·΍౰ͨΓલ
   w @types/something͸Πϯε
   τʔϧෆཁͰ಺แ͍ͯ͠Δ͜ͱ͢Β͋Δ
   w ৽֓೦ͷొ৔
   w --strictNullChecks
   w neverܕ
   

   View Slide

6. 5ZQF4DSJQUͷࠎ֨Λ࡞ͬͨ࣌୅
   w 5VQMF5ZQFT
   
   w 6OJPO5ZQFT
   
   w 5ZQF(VBSET
   
   w 4USJOH-JUFSBM5ZQFT
   
   w .BQQFE5ZQFT
   
   w $POEJUJPOBM5ZQFT
   
   

   View Slide

7. 5ZQF4DSJQUY
   
   w ৽֓೦ͷొ৔
   w unknownܕ
   w Α
   Γߴ౓ͳܕఆٛͷͨΊͷվྑ
   w Y·Ͱͷ৽ػೳʹର͢Δ֦ு΍վྑ
   w Α
   Γݡ͍ܕਪ࿦ͱܕΨʔ
   υ
   

   View Slide

8. IUUQTRJJUBDPNBEWFOUDBMFOEBSPLVOPLFOUBSPUT
   5ZQF4DSJQUҰਓΞ
   υϕϯ
   τΧϨϯμʔ
   

   View Slide

9. 5ZQF4DSJQU
   
   w 5FNQMBUF-JUFSBM5ZQFT
   w ໘ന͍͜ͱ΍Γ์୊
   w ԼهλΠ
   τϧͰݕࡧ
   wʰ5ZQF4DSJQUܕύζϧͰ࡞ΔNJOJJOUFSQSFUFSʱ
   
   wʰ5ZQF4DSJQUͷܕఆٛͰຑ੃ͷ໾൑ఆΛ͢Δʱ
   

   View Slide

10. 5ZQF4DSJQU
    w 3FDVSTJWF$POEJUJPOBM5ZQFT
    w $POEJUJPOBM5ZQFTͷܕܾఆॲཧ͕࠶ؼՄೳʹͳͬͨ
    w ΧϨϯμʔ
    ʰ࣮ྫRecursivePartialʱ
    ʹͯ঺հ
    

    IUUQT[FOOEFWPLVOPLFOUBSPBSUJDMFTHNQLQH[CHLINCLBQDL
    

    View Slide

11. 5ZQF4DSJQU
    
    w --useUnknownInCatchVariables
    w DBUDIϒϩοΫͰͷFSSม਺͕σϑΥϧ
    τͰunknownܕѻ͍͞ΕΔΑ
    ͏ʹͳͬͨ
    w ·Ͱ͸anyܕ
    w Ҏ߱ɺ
    ΦϓγϣφϧͰunknownܕʹมߋ
    

    View Slide

12. 5ZQF4DSJQU
    
    w /PEFKTʹ͓͚Δ&4.PEVMFʹରԠ͢ΔͨΊͷίϯύΠϧ
    ɾ
    Φϓγϣϯ௥Ճ
    w ͔Βʹ͔͚ͯ$+4 &4.ؔ࿈ͷରԠΛॆ࣮
    wʰ5ZQF4DSJQUͱ/BUJWF/PEFKT&4.ʱ
    ʹৄ͍͠
    

    IUUQTRVSBNZNFEJVNDPNUZQFTDSJQU&"OBUJWFOPEFKTFTNBCB
    

    View Slide

13. 5ZQF4DSJQU
    
    w satisfies0QFSBUPS
    w ٱʑʹ৽֓೦
    w ຊ೔ͷࣛ໺૖͞Μͷ
    ʰ5ZQF4DSJQUͷBTDPOTUTBUJT
    fi
    FT͕ศརʱ
    ͕ৄ͍͠
    

    View Slide

14. ਐԽͷ܏޲
    w 5ZQF4DSJQU͔Β·Ͱ͸ౖ౭ͷਐԽͩͬͨ
    w ೔ʑมΘΔۀ຿্ͰͷςΫχοΫ
    w ػೳ௥Ճͷͨͼʹ
    ʮ͋Ε͸Ͳ͜Ͱ࢖͑Δʯ
    Λߟ͍͑ͯ͘
    w Ҏ߱͸Ұൠతͳ։ൃۀ຿Λ͜ͳ͢ݶΓͰ͸ɺ
    ͔ͳΓΏΔ΍͔ͳਐԽ
    w ΏΔ΍͔͚ͩͲ͔Ώ͍ͱ͜Ζʹख͕ಧ͘ਐԽ͕૿͑ͨ
    w ܕఆٛ࡞੒ऀʹͱͬͯ͸
    ʮ଴ͬͯ·ͨ͠ʯ
    ͳػೳ௥Ճ͕ଟ͍͕
    

    ਺όʔδϣϯ͘
    Β͍ͳΒΩϟονΞοϓ͕஗Εͯ΋େৎ෉
    ʂ
    
    w ஌͓ͬͯ͘
    ͱ
    ʮۀ຿্Ͱͪΐͬͱॿ͔Δʯ
    ͷස౓͕૿͑ͯ͘
    Δ͔΋
    

    View Slide

15. ֶशํ๏ͷεεϝ
    w 5ZQF4DSJQUॳֶऀʹ͸ઐ໳ॻͱ౰ํͷΞ
    υϕϯ
    τΧϨϯμʔ
    ̎
    ̑
    هࣄΛΦεεϝ
    w ઐ໳ॻˠ໢ཏతʹ֬ೝͰ͖Δ
    w Ξ
    υϕϯ
    τΧϨϯμʔˠۀ຿্Ͱͷ޻෉Λ๛෋ʹ঺հ
    w ࠓޙͲ͏
    ͍ͯ͘͠
    ͱΑ͍͔
    ʁ
    
    w 5ZQF4DSJQUࣗମͷΩϟονΞοϓ͸͢Δͱͯ͠ɺ
    Ή͠Ζपลࣄ৘ʹڵຯΛ΋ͭ͜ͱΛΦεεϝ
    w %FOPͱ͸
    ʁ
    #VOͱ͸
    ʁ
    &4ͱ͸
    ʁ
    5$ͱ͸
    ʁ
    
    w Ϟδϡʔϧࣄ৘͸
    ʁ
    $+4 &4.
    όϯ
    υϧࣄ৘͸
    ʁ
    ʢ5VSCP 7JUFͳͲʣ
    

    View Slide

16. 5IBOLZPV
    

    View Slide