File: mappedTypeUnionConstrainTupleTreatedAsArrayLike.ts

package info (click to toggle)
node-typescript 5.1.6%2Bds1-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 492,516 kB
  • sloc: javascript: 2,078,951; makefile: 6; sh: 1
file content (14 lines) | stat: -rw-r--r-- 490 bytes parent folder | download 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
 
// @noEmit: true
// @strict: true

type HomomorphicMappedType<T> = { [P in keyof T]: T[P] extends string ? boolean : null }

function test1<T extends [number] | [string]>(args: T) {
  const arr: any[] = [] as HomomorphicMappedType<T>
  const arr2: readonly any[] = [] as HomomorphicMappedType<T>
}

function test2<T extends [number] | readonly [string]>(args: T) {
  const arr: any[] = [] as HomomorphicMappedType<T> // error
  const arr2: readonly any[] = [] as HomomorphicMappedType<T>
}