// 思考一下:如何从Promise<string>[]中提取string[]? type Unwrap<T> = T extends Promise<infer U> ? Unwrap<U> : T extends Array<infer V> ? UnwrapArray<T> : T type UnwrapArray<T> = T extends Array<infer R> ? { [P in keyof T] : Unwrap<T[P]> } : T type T0 = Unwrap<Pro...
tom.push(1); //实现一个Awaited方法,Promise的接口定义使用了PromiseLike type Unwrap<T> = T extends PromiseLike<infer U> ? U : T; // resolve类型实现是 // resolve<T>(value: T): Promise<Awaited<T>>; // 所以传入的变量会做推断并且传回对应的类型 const resultPromise = Promise.resolve('ss...
"hello world" Error: my error at /home/martin/src/promise-example/example.js:9:35 at Promise._unwrap (/home/martin/src/ts-promise/src/lib/Promise.ts:542:20) at Promise._unwrapper (/home/martin/src/ts-promise/src/lib/Promise.ts:557:19) at CallQueue.flush (/home/martin/src/ts-prom...
这为TS提供了强大的抽象能力。 // 例子:解包Promise中的类型 type Unwrap<T> = T extends Promise<infer U> ? U : T; type p = Unwrap<Promise<number>>; // 例子:路由参数的类型推导 type RouteParams<Route extends string> = Route extends `${string}:${infer Rest}` ? RouteDic<Rest> : never...
利用infer关键字提取Promise结果类型: type UnwrapPromise<T> = T extends Promise<infer U> ? U : T type FetchResult = UnwrapPromise<ReturnType<typeof fetchData>> 性能优化建议: 1.避免深层嵌套的条件类型 2.复杂类型适当使用接口继承 3.合理使用类型断言 4.定期重构重复类型定义 5.利用类型别名提升可读性...
pick()函数在WrapTuple中应该保证返回相同形状的未包装类型(由Unwrap<Tuple>提供),尽管我在该行中得到了类型检查错误。是否可以在不强制强制转 浏览2提问于2021-03-07得票数 7 1回答 根据元组的值按不同的顺序对元组列表进行排序 、 当我们想要排序一个元组列表,其中每个元组的长度都是3(都在增加)时,我们正确...
Usethrow()to unwrap the value after parsing a number functiontoNumber(str:string):Result<number,string>{constresult=Number(str);if(isNaN(result)){returnErr("Couldn't parse a string");}returnOk(result);}constmyNumber:number=toNumber("Hello").throw();// Throws an ErrorconstmyNumber:number...
AsyncOrSync<Type>- Constructs a type withTypeorPromiseLike<Type> AsyncOrSyncType<Type>- UnwrapsAsyncOrSynctype Dictionary<Type, Keys?>- Constructs a required object type which property keys areKeys(stringby default) and which property values areType ...
interface Result<Val, Err> { // Contained Promise value: Val | Err; // Queries unwrap(): Val; unwrapErr(): Err; unwrapOr(altVal: Val): Val; unwrapOrElse(altValFactory: (err: Err) => Val): Val; expect(msg: string): Val; expectErr(msg: string): Err; isOk(): this is OK<...
-AsyncOrSync<Type&rt;- Constructs a type withTypeorPromiseLike<Type&rt; -AsyncOrSyncType<Type&rt;- UnwrapsAsyncOrSynctype -Dictionary<Type, Keys?&rt;- Constructs a required object type which property keys areKeys (stringby default) and which property values areType ...