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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
//// [objectLiteralContextualTyping.ts]
// In a contextually typed object literal, each property value expression is contextually typed by
// the type of the property with a matching name in the contextual type, if any, or otherwise
// for a numerically named property, the numeric index type of the contextual type, if any, or otherwise
// the string index type of the contextual type, if any.
interface Item {
name: string;
description?: string;
}
declare function foo(item: Item): string;
declare function foo(item: any): number;
var x = foo({ name: "Sprocket" });
var x: string;
var y = foo({ name: "Sprocket", description: "Bumpy wheel" });
var y: string;
var z = foo({ name: "Sprocket", description: false });
var z: number;
var w = foo({ a: 10 });
var w: number;
declare function bar<T>(param: { x?: T }): T;
var b = bar({});
var b: {};
//// [objectLiteralContextualTyping.js]
// In a contextually typed object literal, each property value expression is contextually typed by
// the type of the property with a matching name in the contextual type, if any, or otherwise
// for a numerically named property, the numeric index type of the contextual type, if any, or otherwise
// the string index type of the contextual type, if any.
var x = foo({ name: "Sprocket" });
var x;
var y = foo({ name: "Sprocket", description: "Bumpy wheel" });
var y;
var z = foo({ name: "Sprocket", description: false });
var z;
var w = foo({ a: 10 });
var w;
var b = bar({});
var b;
|
