// tsx 中需要加多个 , 或者 extends，否则会识别成 react 的标签 const fn = <T>(p: T): T => { return p; }; const fn2 =

type Person = { name: string; age: number; schools: { id: string }[] }; type PersonSchool = Person["

const person = { name: "lhh", age: "18" }; type PersonKey = keyof typeof person; type Person = { [ke

/** 将类型的所有可选属性（包括嵌套的，同时移除null）都转化为必选 */ type DeepRequired<T> = { [P in keyof T]-?: T[P] extends ob

type RequireKey<T, K extends keyof T> = Omit<T, K> & { [P in K]-?: T[P] }; // type RequireKey2<T, K

type WithPartial<T, K extends keyof T> = Omit<T, K> & Partial<Pick<T, K>>; type Person = { id: str