在 ts 中什么是 infer，并实现 Parameters 与 ReturnType
Issue 欢迎在 Gtihub Issue 中回答此问题: Issue 715 (opens in a new tab)
Author 回答者: heretic-G (opens in a new tab)
type Parameters<T extends (...args: any[]) => unknown> = T extends (
...args: infer R
) => unknown
? R
: never;Author 回答者: zhimazz (opens in a new tab)
Parameters 是啥
Author 回答者: Asarua (opens in a new tab)
Parameters 是啥
取得某个函数的参数类型的高级类型
Author 回答者: iceycc (opens in a new tab)
Parameters
type Parameters<T extends (...args: any) => any> = T extends (
...args: infer P
) => any
? P
: never;type A = Parameters<() => void>; // []
type B = Parameters<typeof Array.isArray>; // [any]
type C = Parameters<typeof parseInt>; // [string, (number | undefined)?]
type D = Parameters<typeof Math.max>; // number[]