File: keyofIsLiteralContexualType.js

package info (click to toggle)
node-typescript 5.2.2-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 497,488 kB
  • sloc: javascript: 2,107,274; makefile: 6; sh: 1
file content (25 lines) | stat: -rw-r--r-- 694 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
//// [tests/cases/compiler/keyofIsLiteralContexualType.ts] ////

//// [keyofIsLiteralContexualType.ts]
// keyof T is a literal contextual type

function foo<T extends { a: string, b: string }>() {
    let a: (keyof T)[] = ["a", "b"];
    let b: (keyof T)[] = ["a", "b", "c"];
}

// Repro from #12455

declare function pick<T, K extends keyof T>(obj: T, propNames: K[]): Pick<T, K>;

let x = pick({ a: 10, b: 20, c: 30 }, ["a", "c"]);
let b = x.b;  // Error

//// [keyofIsLiteralContexualType.js]
// keyof T is a literal contextual type
function foo() {
    var a = ["a", "b"];
    var b = ["a", "b", "c"];
}
var x = pick({ a: 10, b: 20, c: 30 }, ["a", "c"]);
var b = x.b; // Error