yanglinxiao
yanglinxiao
type Simplify = { [K in keyof T]: T[K]; }; type SetOptional = Simplify< Partial & Omit >; type SetRequired = Simplify< Required & Omit >;
type ConditionalPick = { [K in keyof T as (T[K] extends P ? K : never)]: T[K] };
type Fn = (a: number, b: string) => number; type AppendArgument any, A> = ( x: A, ...args: Parameters ) => ReturnType; type AppendArgument2 = F extends (...args: infer Args)...
type JoinStrArray = Arr extends [infer first, ...infer rest] ? `${first extends string ? first : ""}${rest extends [string, ...string[]] ? `${Separator}${JoinStrArray}` : ""}` : ""; // 你的实现代码 // 测试用例...
type NaiveFlat = { [K in keyof T]: T[K] extends any[] ? T[K][number] : T[K] }[number] // 测试用例： type NaiveResult = NaiveFlat; // NaiveResult的结果： "a" | "b" | "c" |...
type SomeType = { prop: string; }; type OnlyKeys = { [K in keyof T2]: K extends keyof T1 ? T2[K] : never; }; // 更改以下函数的类型定义，让它的参数只允许严格SomeType类型的值 function takeSomeTypeOnly(x: OnlyKeys) {...