-
-
Notifications
You must be signed in to change notification settings - Fork 1.8k
/
Copy pathproperties.interfaces.ts
51 lines (45 loc) · 2.25 KB
/
properties.interfaces.ts
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
48
49
50
51
// Copyright (c) 2022, Compiler Explorer Authors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
export type PropertyValue = string | boolean | number | undefined;
// names don't matter
interface TypeMap {
a: string;
b: boolean;
c: number;
d: undefined;
}
export type Widen<T> = T extends T
? {
[P in keyof TypeMap]: T extends TypeMap[P] ? TypeMap[P] : never;
}[keyof TypeMap]
: T;
// TODO(jeremy-rifkin): I think the types could use some work here.
// Maybe props<string>(property) should be string | undefined.
function superficialGetter(property: string, defaultValue?: undefined): PropertyValue;
function superficialGetter<T extends PropertyValue>(property: string, defaultValue: Widen<T>): typeof defaultValue;
function superficialGetter<T extends PropertyValue>(property: string, defaultValue?: unknown): T;
function superficialGetter(property: string, defaultValue?: unknown): unknown {
return;
}
export type PropertyGetter = typeof superficialGetter;