Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
todays-typescript.pdf
Search
Taketoshi Aono(青野健利 a.k.a brn)
June 19, 2018
2
460
todays-typescript.pdf
Taketoshi Aono(青野健利 a.k.a brn)
June 19, 2018
Tweet
Share
More Decks by Taketoshi Aono(青野健利 a.k.a brn)
See All by Taketoshi Aono(青野健利 a.k.a brn)
document.write再考
brn
6
3k
Parsing Javascript
brn
14
9.2k
JSON & Object Tips
brn
1
490
CA 1Day Youth Bootcamp for Frontend LT
brn
0
940
Modern TypeScript
brn
2
800
javascript - behind the scene
brn
3
740
tc39 proposals
brn
0
880
プロダクト開発とTypeScript
brn
8
2.9k
React-Springでリッチなアニメーション
brn
1
690
Featured
See All Featured
Building a Modern Day E-commerce SEO Strategy
aleyda
42
7.4k
How to train your dragon (web standard)
notwaldorf
94
6.1k
Build The Right Thing And Hit Your Dates
maggiecrowley
36
2.8k
Unsuck your backbone
ammeep
671
58k
A designer walks into a library…
pauljervisheath
207
24k
What's in a price? How to price your products and services
michaelherold
246
12k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
248
1.3M
Speed Design
sergeychernyshev
32
1k
The Invisible Side of Design
smashingmag
300
51k
VelocityConf: Rendering Performance Case Studies
addyosmani
331
24k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
194
16k
Building Flexible Design Systems
yeseniaperezcruz
328
39k
Transcript
Today's TypeScript Types for beginner
Name @brn (ꫬꅿ⨳ⵃ) Occupation ؿٗٝزؒٝسؒٝآص،٥ط؎ذ؍ـؒٝآص، Company Cyberagent ،سذؙأةآؔ AI Messenger
OSS Contributor of V8 About http://info.b6n.ch
➙傈ך鑧כ֮תTSח鍗גְזְ➂הַ ➙䖓⢪ֲֶַה䙼גְ➂ぢֽדׅկ
僴➙ךTypeScript 㘗ך乼⡲ְָםְדֹ״ֲחזת׃կ Ecmascriptך➬圫חꟼ׃גכ鋉䚍ָ֮תזֻⰅגְךד満 殛 babel⢪זֻגְְְֻחכ㹋鄲ׁג
TypeScriptך㘗 javascriptח㢌䳔ׁךדծ㹋遤儗חכ䠐ָ㣟 ֻ֮תד؝ٝػ؎ٕ儗ח撑ׁثؑحֽׁؙ ֽו갹䓸ג稢ַֻ剅ֽלծ؝ٝػ؎ٕ儗חٓٝة؎يؒٓ٦ קר嗚叨דֹ ַ갹䓸ך
㘗? 㢌侧ח㼎׃ג⦼ָ䭷㹀ׁⵖ秈弫׃גְַוֲַ嗚鏾ׅ ך
const value: string = 1;!
⽃秪ז㘗 ءٝفٕחstringהַnumberהַ剅ֻװא ֮הכ荈⡲ךؙٓأהַ
const value: string = 'string';! const value: number = 1;!
interface/class interfaceהclass
interface X {! getName(): string;! getAge(): number;! }! ! class
XImpl implements X {! getName() {return 'Aono';}! getAge() {return 31;}! }!
Generics 㘗⹛涸ח㢌ִװא
interface M<T> {! getValue(): T;! }! ! class MImpl implements
M<string> {! getValue(): string {! return 'foobarbaz'! }! }!
醱さر٦ة㘗ך琎꧊さ٥锷椚ㄤ 㘗穠さׅװא
type A = {! a: number,! b: string! } &
{! c: RegExp! };!
type B = {! a: number,! b: string! } |
{! a: string,! b: number! };!
nullךثؑحؙ strictNullCheckהְֲؔفءّٝonחׅה nullableהnonnullableׯהثؑحؙׅ
let value: string | null = null;!
➙傈鑧׃ַװא ➭חְְ⤑ⵃז㘗ך堣腉ָ֮ ָծאתךד満殛 ַָֿ鑧׃ַװא
㘗ג⦜ 㹑鎉涸ד֮䗳銲ָ֮גծהחַֻ剅ֻךָ⦜
const x: {a: string, b: number} = obj;! const y:
{a: number, b: string} = obj;! ! const x: {! a: MyClass<MyInnerClass<string>>,! ...! } = obj;! const y: {! a: MyClass<MyInnerClass<number>>,! ...! } = obj;!
Mapped Type 㘗ךⱖ⫷⡲䧭ׅ
type Person = {! name: string;! age: number;! }!
type FetchedPerson = {! [P in Person]: Promise<Person[P]>! };! !
type FetchedPerson = {! name: Promise<string>;! age: Promise<number>;! }!
type Promisify<T> = {! [P in T]: Promise<T[P]>! };! !
type FetchedPerson = Promisify<Person>;!
Conditional Type 㘗ד♲갪怴皾㶨ַָֽ״
Infer operator 㘗㢌侧ךفٖ٦أمٕت٦ה׃ג堣腉ׅ״խ
ֿך2אָَغ؎דׅ ꟼ侧ך䨱⦼《䖤׃ PromiseⰋ鿇䒷ָ׃ ꂁך銲稆㘗《䖤׃
type MyReturnType<T> = ! T extends (...args: any) => infer
X? X: T;! ! interface X {! getName(): string! }! ! type R = MyReturnType<X['getName']>! ꟼ侧ך䨱⦼《䖤
type UnPromisifyField<T> = {! [P in keyof T]:! T[P] extends
Promise<infer X>? UnPromisify<X>! : UnPromisify<T[P]>;! }! ! type UnPromisify<T> =! T extends Promise<infer X>? UnPromisifyField<X>! : UnPromisifyField<T>; Promise䒷ָׅ
type X = {! y: {! value: Promise<string>;! };! z:
Promise<number>! }! ! type Y = UnPromisify<X>;!
type ArrayElementType<T> = T extends Array<infer R>! ? R! :
T extends ArrayLike<infer R>! ? R! : T extends NodeListOf<infer R> ? R! : T extends NodeList ? Node[] : T;! ꂁך銲稆㘗《䖤
➭ח 㘗ず㡦ך䊴ⴓծ֮㘗ַ暴㹀ךفٗػذ؍ֽ嶊׃ 暴㹀ךفٗػذ؍ֽ䫙ֹ⳿׃㘗⡲ החַֻ㘗דⶴה⡦דדֹ鎉铂חזת׃կ
type X = {! a: string;! b: number;! c: string;!
};! ! type Y = Pick<X, 'a' | 'b'>;!
劢勻? ➙כTupleדbindװapplyך㘗邌ֲה׃גְדׅי
תה TypeScriptך㘗כַז厫鮾חזךדծ㘗ך鿇ⴓד♶弫ח䙼ֲ ֿהכְע幾גתׅ 僽ꬊֶ鑐׃ ׀幠耮ָ֮הֲ׀ְׂת׃կ