TypeScript Evolution - Speaker Deck

TypeScript Evolution

by Yosuke Kurami

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5ZQF4DSJQU &WPMVUJPO IUNMDPOGFSFODF CZ!2VSBNZ

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"CPVUNF w ૔ݟ༸ีBLB!2VSBNZ w ϑϩϯτΤϯυΤϯδχΞ w ීஈ͸3FBDU3FEVY ͱ'MPX Ͱ8FCΞϓϦॻ͍ͯ·͢

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๻ͱ5ZQF4DSJQU w ΋ͱ΋ͱ"OHVMBS͕޷͖ w ೥݄ʹ(PPHMF͕ʮ"OHVMBSY͸5ZQF4DSJQUʹ͢ ΔΘʔʯͱએݴͨ͠λΠϛϯάͰ5ZQF4DSJQUʹڵຯΛ࣋ͭ w Ͱ΋7JNͰॻ͖͔ͨͬͨͷͰɺQMVHJOͭ͘Δ  IUUQTHJUIVCDPN2VSBNZUTVRVZPNJ w ࢓ࣄͰ΋UTॻ͖ͨ͘ͳͬͯϑϩϯτʹδϣϒνΣϯ

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"HFOEB 5ZQF4DSJQU֓ཁ ͜͜೥ͷ৽ػೳ$PNQJMFSฤ ͜͜೥ͷ৽ػೳ-BOHVBHF4FSWJDFฤ

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5ZQF4DSJQU֓ཁ

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5ZQF4DSJQUͱ͸ w IUUQTXXXUZQFTDSJQUMBOHPSH w .JDSPTPGU͕։ൃͨ͠"MU+BWB4DSJQU  ओཁͳઃܭऀʹ"OEFST)FKMTCFSH͕͍Δ w ੩తͳܕ෇ݴޠ w #PPUTUSBQQJOH w ΤσΟλϑϨϯυϦʔ

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ܕνΣοΫͱਪ࿦ w ؔ਺TVNͷ໭Γ஋͸OVNCFSͰ͋Δ͜ͱΛਪ࿦͢Δ function sum(a: number, b: number) { return a + b; } console.log(sum(1, sum(1, 1))); // OK // Argument of type '"a"' is not assignable to // parameter of type 'number' console.log(sum('a', 'b'));

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4USVDUVBM4VCUZQJOH w 5ZQF4DSJQU͸ߏ଄త෦෼ܕΛ࠾༻͍ͯ͠Δ w %VDL5ZQJOHͷܕόʔδϣϯͷΑ͏ͳ΋ͷ w ܕͷܧঝؔ܎͸ؾʹͤͣɺܕ͕΋͍ͬͯΔϝιουɾϓϩ ύςΟͷ߹கͷΈΛؾʹ͢Δ

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4USVDUVBM4VCUZQJOH class Hoge { name = "Kurami"; } class Foo { name = "Quramy"; } function sayHello(obj: { name: string }) { console.log(obj.name); } sayHello(new Hoge()); sayHello(new Foo()); sayHello(new Error("error"));

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༨ஊ /PNJOBMʹ͍ͨ͠ͱ͖ w ͨ·ʹߏ଄త෦෼ܕͩͱࠔΔ͜ͱ͕͋Δ w QSJWBUFϑΟʔϧυΛ࢖͏ϋοΫͰճආ͢Δ class DateISOString { private _ = Symbol("DateISOString"); readonly isoString = new Date().toISOString(); } function hoge(x: DateISOString) { console.log(x.isoString); } hoge(new DateISOString()); hoge({ isoString: "hoge" }); // Error

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4USJDUDIFDL w TUSJDUΦϓγϣϯʢσϑΥϧτͰPOʣΛ෇͚͓ͯ͘ͱɺݎ ࿚ͳνΣοΫ͕Մೳʹ function hoge(x?: string) { //Object is possibly 'undefined'. return x.trim(); } function hoge(x?: string) { if (!x) return ""; return x.trim(); // OK }

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BMMPXKTDIFDLKT w ৽͘͠ϓϩδΣΫτΛ࡞Δͱ͖͸ɺTUSJDUͰΑ͍ w Ұํɺطଘͷ+BWB4DSJQUϓϩδΣΫτʹ5ZQF4DSJQUΛಋೖ ͢Δ͜ͱ΋Մೳ w BMMPXKTDIFDLKTΦϓγϣϯΛPOʹ͢ΔͱɺUT͚ͩͰ ͳ͘ɺKTϑΝΠϧΛѻ͏͜ͱ΋Ͱ͖ΔͷͰɺগͣͭ͠UT΁ ஔ͖׵͑Δ͜ͱ͕Ͱ͖Δ

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ϥΠϒϥϦͷܕఆٛ w ༗໊ͳϥΠϒϥϦ͸OQNJ!UZQFϥΠϒϥϦ໊Ͱܕఆٛ ͕ެ։͞Ε͍ͯΔ npm i @types/node import path from "path"; export function hoge() { const x = path.join("src", "main.ts"); }

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!UZQFT w IUUQTHJUIVCDPN%FpOJUFMZ5ZQFE%FpOJUFMZ5ZQFE

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3FMFBTFDZDMF w ϲ݄पظͰϚΠφʔόʔδϣϯ͕VQEBUF͞Ε͍ͯ͘ w ηϚϯςΟοΫόʔδϣϯχϯάͰ͸ͳ͍ w ͷΑ͏ͳNJOPSVQEBUFͰ͋ͬͯ΋ɺഁյతม ߋ͕ՃΘΔ͜ͱ΋͋Δ w CMPHͰഁյతมߋʹ͍ͭͯΞφ΢ϯε͕͋ΔͷͰɺͦΕΛ ΑΜͰ͔ΒVQEBUF͢ΔͱΑ͍

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#SFBLJOH$IBOHFT

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5$ͱͷ݉Ͷ߹͍ w جຊతʹ5$ͰTUBHFʹͳͬͨ࢓༷͕औΓࠐ·ΕΔ w ྫ w /VNFSJD4FQBSBUPS w #JH*OU const i = 60_000;

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͍͔ͭ͘ͷྫ֎ w FYQFSJNFOUBM%FDPSBUPS FNJU%FDPSBUPS.FUBEBUB w WY͔Βར༻Մೳɻ"OHVMBS͸͜Ε͕ͳ͍ͱ੒Γཱͨ ͳ͍ w KTYSFBDU w WY͔Βར༻ՄೳɻΈΜͳେ޷͖+49

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͜͜೥ͷ৽ػೳ $PNQJMFSฤ

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$PNQJMFS

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FT.PEVMF*OUFSPQ

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FT.PEVMFT*OUFSPQ w ೥Նࠒʹ/PEFKTͷ&4.PEVMFTʹ͍ͭͯͷऔѻʹಈ ͖͕͋ͬͨͷΛड͚ͯɺWYͰಋೖ͞ΕͨΦϓγϣϯ w ৄ͘͠͸IUUQTUFQQFJTIBUFOBCMPHDPNFOUSZ FTNPEVMFTJOOPEFKTͳͲΛࢀর w &4.PEVMFT͔Β$PNNPO+4NPEVMFΛJNQPSU͢Δࡍ͸ EFGBVMUJNQPSUΛ࢖ΘͶ͹ͳΒͳ͍

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FT.PEVMFT*OUFSPQ w /PEFKTͰ͸ɺ$PNNPO+4͔ΒOBNFEJNQPSU͢ΔͱΤ ϥʔʹ /* hoge.mjs */ import { readFile } from "fs"; $ node --experimental-modules hoge.mjs SyntaxError: The requested module does not provide an export named ‘readFile' at checkComplete (internal/loader/ModuleJob.js:75:27) at moduleJob.linked.then (internal/loader/ModuleJob.js: 58:11) at

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FT.PEVMFT*OUFSPQ w Ұํɺ5ZQF4DSJQUͰ͸ඇ&4.PEVMFT͔ΒͷEFGBVMU JNQPSU͸ར༻Ͱ͖ͳ͔ͬͨͨΊɺ$PNNPO+4ΛJNQPSU͢ Δʹ͸ɺOBNFEJNQPSUͰهड़͢Δ͔͠ͳ͔ͬͨ import * as fs from "fs"; import { readFile } from "fs";

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FT.PEVMFT*OUFSPQ w WYҎ߱Ͱ͸ɺ$PNNPO+4͔ΒͷEFGBVMUJNQPSU͕ڐ༰͞ ΕΔΑ͏ʹͳͬͨ w ैདྷͷOBNFEJNQPSUͷॻ͖ํ΋ґવڐ༰͸͞Ε͍ͯΔ΋ͷ ͷɺ5ZQF4DSJQU΋ެࣜʹEFGBVMUJNQPSUͷॻ͖ํΛਪ঑ͯ͠ ͍Δɻ  IUUQTXXXUZQFTDSJQUMBOHPSHEPDTIBOECPPLSFMFBTF OPUFTUZQFTDSJQUIUNMTVQQPSUGPSJNQPSUEGSPN DKTGPSNDPNNPOKTNPEVMFTXJUIFTNPEVMFJOUFSPQ import fs from "fs";

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*NQSPWF.BQQFE 5ZQF.PEJpFS

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.BQQFE5ZQF.PEJpFS w WYͰಋೖ w ैདྷͷ.BQQFE5ZQFͰ͸ɺSFBEPOMZ Λ෇༩͢Δ͜ͱ ͸Ͱ͖ͯ΋ɺղআ͢Δ͜ͱ͸Ͱ͖ͳ͔ͬͨ type Optional = { [P in keyof T]?: T[P] }; type ReadOnly = { readonly [P in keyof T]: T[P] };

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XJUINPEJpFS w ͷ෇༩Ͱɺ࡞༻ͷ޲͖ ෇͚Δ֎͢ ΛදݱՄೳʹ type Optional = { [P in keyof T]+?: T[P] }; type Strict = { [P in keyof T]-?: T[P] }; type ReadOnly = { +readonly [P in keyof T]: T[P] }; type Mutable = { -readonly [P in keyof T]: T[P] };

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XJUINPEJpFS type Strict = { [P in keyof T]-?: T[P] }; // Property 'name' is missing in type '{}' // but required in type 'Strict<{ name?: string | undefined; }>'. const x: Strict<{ name?: string }> = { };

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$POEJUJPOBMUZQFT

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$POEJUJPOBMUZQFT w WYͰಋೖ w "TTJHOBCMFΛ৚݅ͱͯ͠෼ذ͢ΔܕΛදݱՄೳ w ʮܕ5͕ܕ6ͷ෦෼ܕͰ͋Ε͹ɺܕ9ɺͦ͏Ͱͳ͚Ε͹ܕ:ʯ ͱ͍͏ҙຯ type MyType = T extends U ? X : Y;

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-FUTUZQF w ༡ΜͰΈΑ͏$POEJUJPOBM5ZQFT w %J⒎ w %J⒎͸ͲΜͳܕͰ͠ΐ͏͔ʁ type DiffKey = K1 extends K2 ? never : K1; type $Diff = { [P in DiffKey]: T[P]; };

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%JTUSJCVUJPO w $POEJUJPOBM5ZQFTͱ6OJPO5ZQFTͷؒʹ͸෼഑཯͕੒ཱ w OFWFS͸͍͔ͳΔܕʹ΋୅ೖෆՄೳͳܕʢϘτϜܕʣ w type DiffKey = K1 extends K2 ? never : K1; let key: DiffKey<("name" | "age"), "age">; // ("name" extends "age" ? never : "name") // | ("age" extends "age" ? never : "age") // = ("name" | never) // = "name"

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$POEJUJPOJONBQQFEUZQFT w %J⒎,FZLFZPG5 LFZPG6͸ʮܕ5ͷLFZશମ͔Βɺܕ6 ͷLFZશମͷू߹ΛҾ͍ͨू߹ʯ w .BQQFE5ZQF͸͋ΔLFZͷू߹ʹର͢ΔϓϩύςΟͷϚο ϐϯά type $Diff = { [P in DiffKey]: T[P]; };

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%J⒎ͷਖ਼ମ w 'MPXUZQFʹಉ໊ͷ6UJMJUZUZQF͕͋Γ·͢ type DiffKey = K1 extends K2 ? never : K1; type $Diff = { [P in DiffKey]: T[P]; }; const defaultProps = { age: 0 }; let requiredProps: $Diff<{ name: string; age: number; }, typeof defaultProps>; requiredProps = { name: "Quramy" };

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5ZQFJOGFSFODFJO  DPOEJUJPOBMUZQFT

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5ZQFJOGFSFODFJO DPOEJUJPOBMUZQFT w WYͰ$POEJUJPOBM5ZQFTͱಉ࣌ʹϦϦʔε͞Εͨػೳ w $POEJUJPOBM5ZQFTͷ৚݅෦෼ʹͯϚονϯά࣌ʹਪ࿦͞ ΕͨܕΛ࠶ར༻Ͱ͖ΔΑ͏ʹ T extends MyCondition ? SomeType : Y;

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*OGFSBOE$BQUVSF w ਖ਼نදݱͷΩϟϓνϟϦϯάʢάϧʔϓԽʣͱࣅ͍ͯΔ w Ϛονͨ͠άϧʔϓ෦෼Λޙ͔Βར༻Ͱ͖Δ const regexp = /hoge(\d+)/; const hit = "hoge10".match(regexp); console.log(hit[1]) // 10

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*OGFSBOE$BQUVSF w 5͕ؔ਺Ͱ͋Ε͹ɺͦͷ໭Γ஋ͱͯ͠ਪ࿦͞ΕΔܕ͕3ʹ֨ ೲ͞ΕΔ type Return = T extends (...args: any[]) => infer R ? R : never; let r: Return<() => number>; // typeof r = number

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3FEVYͬΆ͍ΞϨ type Return = T extends (...args: any[]) => infer R ? R : never; type AppState = { [P in keyof T]: Return }; const reducers = { name: (state: string, action: any) => state, age: (state: number, action: any) => state, }; let appState: AppState; // typeof appState = { name: sting, age: number }

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࢖͍͗͢ʹ஫ҙ w $POEJUJPOBM5ZQFTͱ5ZQF*OGFSFODF SZʹΑͬͯɺطଘ ͷܕఆ͔ٛΒ৽͘͠ܕΛ࡞Δखஈ͕֨ஈʹ޲্ w ॻ͍ͯΔͱ͖͸ύζϧײ֮Ͱָ͍͠΋ͷͷɺద౓ͳ༻๏ɾ ༰ྔΛ৺͕͚ͨ΄͏͕Α͍ w Τϥʔϝοηʔδ͕ͲΜͲΜಡΈͮΒ͘ͳΔ w ϨϏϡΞ͕ͨ·ͬͨ΋Μ͡Όͳ͍

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VOLOPXO

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VOLOPXOUZQF w WYͰಋೖ w VOLOPXO͸͢΂ͯͷܕ͕BTTJHOBCMF w VOLOPXOUZQF͸ɺUZQFBTTFSUJPO͠ͳ͍ͱԿ΋Ͱ͖ͳ͍ function hoge(x: unknown) { if (typeof x === "string") { console.log(x.toLowerCase()); } } hoge(10); hoge("foo");

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5VQMFTJOSFTUQBSBNFUFST BOETQSFBEFYQSFTTJPOT

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5VQMFTJOSFTUQBSBNFUFST BOETQSFBEFYQSFTTJPOT w WYͰɺؔ਺Ҿ਺ʹؔ܎͢Δܕͷهड़ྗ͕ڧԽ͞Εͨ w 3FTUQBSBNFUFSTXJUIUVQMFUZQFT w 4QSFBEFYQSFTTJPOTXJUIUVQMFUZQFT w (FOFSJDSFTUQBSBNFUFST w 0QUJPOBMFMFNFOUTJOUVQMFUZQFT w 3FTUFMFNFOUTJOUVQMFUZQFT

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3FTUQBSBNFUFSTXJUI UVQMFUZQFT w WYҎલ͸3FTU1BSBNFUFS͸"SSBZUZQFͷΈ͕ڐ༰ w WY͔Β͸5VQMFUZQF΋ར༻Մೳʹ function hoge(...args: any[]) { const a1 = args[0]; const a2 = args[1]; const a3 = args[2]; } function foo(...args: [string, number]) { const a0 = args[0]; // string const a1 = args[1]; // number const a2 = args[2]; // error }

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4QSFBEFYQSFTTJPOTXJUI UVQMFUZQFT w 4QSFBE0QFSBUPSʹΑΔؔ਺ݺͼग़͠ʹରԠ  Ҏલ͸DPNQJMFFSSPSʹͳͬͯ͠·͍ͬͯͨ w WY͔Β͸5VQMFUZQF΋ར༻Մೳʹ declare function foo(a: number, b: number): void; const args1 = [1, 2] as [number, number]; foo(...args1); const args2 = [1, "bar" ] as [number, string]; // Argument of type 'string' is not assignable to // parameter of type 'number'. foo(...args2);

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(FOFSJDSFTUQBSBNFUFST w 3FTU1BSBNFUFSTʹ૯শܕ͕ར༻Մೳʹ w +BWB4DSJQUGVODUJPOͷCJOEDBMMBQQMZͱͷ਌࿨ੑ޲্  ޙड़ͷTUSJDU#JOE$BMM"QQMZͷૅ declare function curry( fn: (x: T, ...args: U) => R ): (x: T) => (...args: U) => R; const sum = (a: number, b: number) => a + b; const bound = curry(sum)(1); const x = bound(2); // type of x = number const error = bound("hoge"); // error

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0QUJPOBMFMFNFOUTJOUVQMF UZQFT w 5VQMF5ZQFͷதͰ NPEJpFS͕ར༻Մೳʹ w 3FTU1BSBNFUFSTΛ5VQMF5ZQFͰड͚ΕΔΑ͏ͳͬͨ͜ ͱʹΑΔ෭࢈෺ type Tuple = [number, string?]; const x1: Tuple = [1]; const x2: Tuple = [1, "foo"];

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3FTUFMFNFOUTJOUVQMF UZQFT w 5VQMF5ZQFதʹ3FTUͳUZQFΛදݱͰ͖ΔΑ͏ʹͳͬͨ w ؔ਺ͷ3FTU1BSBNFUFSTͱͯ͠΋ར༻Մೳ function hoge(...args: T) { return args; } const arr = [1, 2, 3]; const v = hoge("hoge", ...arr); // typeof v = [string, ...number[]] type Hoge = [string, ...number[]];

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.BQQFEUVQMFUZQFT

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.BQQFEUVQMFUZQFT w WYͰಋೖ w WY·Ͱ͸.BQQFE5ZQFʹ"SSBZ-JLFͳ5ZQFΛ৯Θͤ ͯ΋ɺ΄΅ҙຯͷͳ͍݁Ռʹͳ͍ͬͯͨ w WY͔Β͸ʮ഑ྻཁૉࣗମʹର͢ΔϚοϐϯάʯͱ͍͏ ڍಈʹมߋ͞Εͨ

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Y type Box = { value: V }; type Boxing= { [P in keyof T]: Box; }; type User = { name: string, age: number, }; const boxedUser: Boxing = { name: { value: "quramy" }, age: { value: 18 }, }; let boxedNumbers: Boxing; boxedNumbers.concat.value([]); // ??? boxedNumbers.length.value; // ???

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Y w LFZPGOVNCFS<>ͷҙຯ͕มΘͬͨΘ͚Ͱ͸ͳ͍఺ʹ஫ҙ type Box = { value: V }; type Boxing= { [P in keyof T]: Box; }; const boxedNumbers: Boxing = [ { value: 1 }, { value: 100 }, ];

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࢖͍Έͪ w $POEJUJPOBMUZQF (FOFSJDSFTUQBSBNFUFST .BQQFE UVQMFUZQFͷ߹ΘٕͤͷྫΛ঺հ w ͓୊SYKTͷDPNCJOF-BUFTUؔ਺ʢ˞1SPNJTFBMMతͳౕʣ interface Observable { subscribe(cb: (v: T) => void): void; } declare var s1$: Observable; declare var s2$: Observable; combineLatest(s1$, s2$).subscribe(([s1, s2]) => { console.log(s1); // typeof s1 = string console.log(s2); // typeof s2 = number });

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࢖͍Έͪ interface Observable { subscribe(cb: (v: T) => void): void; } // Inference in conditional type type StreamType = T extends Observable ? S : never; // Mapped tuple type type Unboxing[]> = { [P in keyof U]: StreamType; }; // Generic rest parameters declare function combineLatest[]> (...args: U): Observable>;

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TUSJDU#JOE$BMM"QQMZ

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TUSJDU#JOE$BMM"QQMZ w WYͰಋೖ w GVODUJPOͷCJOEDBMMBQQMZʹର͢ΔνΣοΫ͕ݫີԽ w WYͷ5VQMFUZQF3FTUQBSBNFUFSTڧԽͷ෭࢈෺ w TUSJDUΦϓγϣϯϑΝϛϦʔͷͭʢσϑΥϧτͰ0/ʣ

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TUSJDU#JOE$BMM"QQMZ w CJOE declare function hoge(a: number, b: string): void const hoge1 = hoge.bind(null, 1); hoge1("hoge"); hoge1(); // error hoge1(1); // error hoge1("hoge", 2); // error

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TUSJDU#JOE$BMM"QQMZ w DBMM declare function hoge(a: number, b: string): void hoge.call(null, 1, "hoge"); hoge.call(null, 1); // error hoge.call(null, "hoge"); // error hoge.call(null, 1, "hoge", 2); // error

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TUSJDU#JOE$BMM"QQMZ w BQQMZ declare function hoge(a: number, b: string): void hoge.apply(null, [1, "hoge"]); hoge.apply(null, [1]); // error hoge.apply(null, ["hoge"]); // error hoge.apply(null, [1, "hoge", 2]); // error

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͜͜೥ͷ৽ػೳ  -BOHBHF4FSWJDFฤ

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-BOHVBHF4FSWJDF

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0SHBOJ[F*NQPSU

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0SHBOJ[F*NQPSU w WYͰಋೖ w UTTFSWFS -BOHVBHF4FSWJDF ʹPSHBOJ[F*NQPSUίϚϯ υ͕௥Ճ͞Εͨ w UTMJOUͷOPVOVTFEWBSJBCMFT JNQPSU ͷpY૬౰΋΍ͬͯ͘ ΕΔ

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%FNP /* before */ import { hoge } from "./lib"; import { foo } from "./lib"; // no used import import { bar } from "./lib"; hoge(); foo(); /* after */ import { hoge, foo } from "./lib"; hoge(); foo();

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$PEF'JY4VHHFTUJPO

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,JOEPG&SSPST w 5ZQF4DSJQUͷΤϥʔ͸΋ͱ΋ͱछྨ w 4ZOUBY&SSPSͦ΋ͦ΋จ๏ͱ͓͔͍ͯ͠͠΋ͷ w 4FNBOUJD&SSPSܕෆ੔߹ͳͲ

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%FNP w ౾஌ࣝ Τϥʔίʔυ൪୆͸4VHHFTUJPO&SSPS

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3FOBNFJNQPSU EFDMBSBUJPO

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4VNNBSZ

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