考虑以下接口
type State = {
data: any[]
index: number
size: number
count: number
loading: boolean
error: string | undefined
}
我需要创建一个类型，该类型是其属性的并集
{data: any[]} | {index: number} | {size: number} |...
到目前为止，我能够通过使用索引类型访问来合并所有返回类型，但我将获得接口属性的返回类型的并集.
您需要使用distributive-conditional-types:
type State = {
data: any[]
index: number
size: number
count: number
loading: boolean
error: string | undefined
}
type Split<T> = keyof T extends infer Keys // turn on distributivity
? (Keys extends PropertyKey
? (Keys extends keyof T
? Record<Keys, T[Keys]> // apply to each key, or { [prop in Keys]: T[Keys] }for readability
: never)
: never)
: never
// Record<"data", any[]> | Record<"index", number> | Record<"size", number> ...
type Result = Split<State>