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test(Types): add notPropertyOf type-only utility (#6051)

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This commit is contained in:
Antonio Román
2021-07-05 17:07:45 +02:00
committed by GitHub
parent 3022b0f5b1
commit 03fe6ee4e4
1 changed files with 6 additions and 4 deletions
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10
typings/index.ts
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@@ -428,6 +428,7 @@ client.login('absolutely-valid-token');
// Test type transformation:
declare const assertType: <T>(value: T) => asserts value is T;
declare const serialize: <T>(value: T) => Serialized<T>;
declare const notPropertyOf: <T, P extends string>(value: T, property: P & Exclude<P, keyof T>) => void;
assertType<undefined>(serialize(undefined));
assertType<null>(serialize(null));
@@ -483,7 +484,8 @@ assertType<Message | null>(dmChannel.lastMessage);
assertType<Message | null>(threadChannel.lastMessage);
assertType<Message | null>(newsChannel.lastMessage);
assertType<Message | null>(textChannel.lastMessage);
// @ts-expect-error
assertType<never>(user.lastMessage);
// @ts-expect-error
assertType<never>(guildMember.lastMessage);
notPropertyOf(user, 'lastMessage');
notPropertyOf(user, 'lastMessageId');
notPropertyOf(guildMember, 'lastMessage');
notPropertyOf(guildMember, 'lastMessageId');