mirror of
https://github.com/sindresorhus/type-fest.git
synced 2025-12-08 19:25:05 +00:00
35 lines
1.1 KiB
TypeScript
35 lines
1.1 KiB
TypeScript
import {expectAssignable, expectError, expectNotAssignable, expectType} from 'tsd';
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import type {UnknownArray} from '../index';
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declare const foo: readonly [];
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declare const bar: {
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readonly array: unknown[];
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};
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expectAssignable<UnknownArray>(foo);
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expectAssignable<UnknownArray>(bar.array);
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expectAssignable<UnknownArray>([]);
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expectAssignable<UnknownArray>(['foo']);
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expectNotAssignable<UnknownArray>(null);
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expectNotAssignable(undefined);
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expectNotAssignable({});
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expectNotAssignable({0: 1});
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expectNotAssignable(1);
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expectNotAssignable(Date);
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type IsArray<T> = T extends UnknownArray ? true : false;
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declare const string: IsArray<string>;
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expectType<false>(string);
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declare const array: IsArray<[]>;
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expectType<true>(array);
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declare const tuple: IsArray<['foo']>;
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expectType<true>(tuple);
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declare const readonlyArray: IsArray<readonly number[]>;
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expectType<true>(readonlyArray);
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declare const leadingSpread: IsArray<readonly [number, ...string[]]>;
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expectType<true>(leadingSpread);
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declare const trailingSpread: IsArray<readonly [...string[], number]>;
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expectType<true>(trailingSpread);
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