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
52
53
54
55
56
57
58
59
60
|
//// [complicatedIndexedAccessKeyofReliesOnKeyofNeverUpperBound.ts]
interface TextChannel {
id: string;
type: 'text';
phoneNumber: string;
}
interface EmailChannel {
id: string;
type: 'email';
addres: string;
}
type Channel = TextChannel | EmailChannel;
export type ChannelType = Channel extends { type: infer R } ? R : never;
type Omit<T, K extends keyof T> = Pick<
T,
({ [P in keyof T]: P } & { [P in K]: never } & { [x: string]: never })[keyof T]
>;
type ChannelOfType<T extends ChannelType, A = Channel> = A extends { type: T }
? A
: never;
export type NewChannel<T extends Channel> = Pick<T, 'type'> &
Partial<Omit<T, 'type' | 'id'>> & { localChannelId: string };
export function makeNewChannel<T extends ChannelType>(type: T): NewChannel<ChannelOfType<T>> {
const localChannelId = `blahblahblah`;
return { type, localChannelId };
}
const newTextChannel = makeNewChannel('text');
// This should work
newTextChannel.phoneNumber = '613-555-1234';
const newTextChannel2 : NewChannel<TextChannel> = makeNewChannel('text');
// Compare with this, which ofc works.
newTextChannel2.phoneNumber = '613-555-1234';
//// [complicatedIndexedAccessKeyofReliesOnKeyofNeverUpperBound.js]
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.makeNewChannel = void 0;
function makeNewChannel(type) {
var localChannelId = "blahblahblah";
return { type: type, localChannelId: localChannelId };
}
exports.makeNewChannel = makeNewChannel;
var newTextChannel = makeNewChannel('text');
// This should work
newTextChannel.phoneNumber = '613-555-1234';
var newTextChannel2 = makeNewChannel('text');
// Compare with this, which ofc works.
newTextChannel2.phoneNumber = '613-555-1234';
|
