1367 - Remove Index Signature

1367 - Remove Index Signature

by hiroya iizuka (@hiroyaiizuka) #中等 #object-keys

题目

Implement RemoveIndexSignature<T> , exclude the index signature from object types.

For example:

type Foo = {
  [key: string]: any
  foo(): void
}

type A = RemoveIndexSignature<Foo> // expected { foo(): void }

在 Github 上查看：https://tsch.js.org/1367/zh-CN

代码

/* _____________ 你的代码 _____________ */

type RemoveIndexSignature<T, P = PropertyKey> = {
  [K in keyof T as P extends K ? never : K extends P ? K : never]: T[K]
}

测试用例

/* _____________ 测试用例 _____________ */
import type { Equal, Expect } from '@type-challenges/utils'

type Foo = {
  [key: string]: any
  foo(): void
}

type Bar = {
  [key: number]: any
  bar(): void
  0: string
}

const foobar = Symbol('foobar')
type FooBar = {
  [key: symbol]: any
  [foobar](): void
}

type Baz = {
  bar(): void
  baz: string
}

type cases = [
  Expect<Equal<RemoveIndexSignature<Foo>, { foo(): void }>>,
  Expect<Equal<RemoveIndexSignature<Bar>, { bar(): void, 0: string }>>,
  Expect<Equal<RemoveIndexSignature<FooBar>, { [foobar](): void }>>,
  Expect<Equal<RemoveIndexSignature<Baz>, { bar(): void, baz: string }>>,
]

相关链接

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