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外观

Union to Object from key

约 131 字小于 1 分钟

2026-02-11

题目

Find the object containing the key in the union type by the key. It takes two parameters: a union of object types and a key name.

解题思路

待补充

答案

type UnionToObjectFromKey<Union, Key> = any

验证

import type { Equal, Expect } from '@type-challenges/utils'

type Foo = {
  foo: string
  common: boolean
}

type Bar = {
  bar: number
  common: boolean
}

type Other = {
  other: string
}

type cases = [
  Expect<Equal<UnionToObjectFromKey<Foo | Bar, 'foo'>, Foo>>,
  Expect<Equal<UnionToObjectFromKey<Foo | Bar, 'common'>, {
    foo: string
    common: boolean
  } | {
    bar: number
    common: boolean
  }>>,
  Expect<Equal<UnionToObjectFromKey<Foo | Bar | Other, 'common'>, {
    foo: string
    common: boolean
  } | {
    bar: number
    common: boolean
  }>>,
]

参考

无