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34b8fadfa3
Co-authored-by: Som Shekhar Mukherjee <49264891+som-sm@users.noreply.github.com> Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>
54 lines
2.5 KiB
TypeScript
54 lines
2.5 KiB
TypeScript
import {expectType} from 'tsd';
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import type {ExcludeRestElement} from '../index.d.ts';
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// Basic static tuples (No rest element)
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expectType<ExcludeRestElement<[]>>({} as []);
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expectType<ExcludeRestElement<[1]>>({} as [1]);
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expectType<ExcludeRestElement<[1, 2, 3]>>({} as [1, 2, 3]);
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expectType<ExcludeRestElement<readonly ['a', 'b']>>({} as readonly ['a', 'b']);
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// Leading rest element
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expectType<ExcludeRestElement<[...string[], 1]>>({} as [1]);
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expectType<ExcludeRestElement<[...number[], 'a', 'b']>>({} as ['a', 'b']);
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expectType<ExcludeRestElement<[...any[], true]>>({} as [true]);
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expectType<ExcludeRestElement<[...never[], 'end']>>({} as ['end']);
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expectType<ExcludeRestElement<[...unknown[], 2, 3]>>({} as [2, 3]);
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// Middle rest element
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expectType<ExcludeRestElement<['a', ...string[], 'z']>>({} as ['a', 'z']);
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expectType<ExcludeRestElement<['x', ...boolean[], true]>>({} as ['x', true]);
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expectType<ExcludeRestElement<['x', ...any[], 'y']>>({} as ['x', 'y']);
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expectType<ExcludeRestElement<['x', ...readonly number[], 'y']>>({} as ['x', 'y']);
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// Trailing rest element
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expectType<ExcludeRestElement<[1, 2, ...string[]]>>({} as [1, 2]);
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expectType<ExcludeRestElement<['foo', ...Array<'bar'>]>>({} as ['foo']);
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expectType<ExcludeRestElement<[number, ...number[]]>>({} as [number]);
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// Only rest element
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expectType<ExcludeRestElement<string[]>>({} as []);
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expectType<ExcludeRestElement<readonly number[]>>({} as readonly []);
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expectType<ExcludeRestElement<readonly [...boolean[]]>>({} as readonly []);
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expectType<ExcludeRestElement<[...string[]]>>({} as []);
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// Optional & mixed optional
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expectType<ExcludeRestElement<[string?, boolean?, ...number[]]>>({} as [string?, boolean?]);
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expectType<ExcludeRestElement<[number, boolean?, ...number[]]>>({} as [number, boolean?]);
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expectType<ExcludeRestElement<[1?, ...string[]]>>({} as [1?]);
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// Unions
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expectType<ExcludeRestElement<[1, ...string[]] | [2, ...number[]]>>({} as [1] | [2]);
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expectType<ExcludeRestElement<[...boolean[], 'end'] | ['start', ...string[]]>>({} as ['end'] | ['start']);
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// Readonly
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expectType<ExcludeRestElement<readonly [...number[], 'done']>>({} as readonly ['done']);
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expectType<ExcludeRestElement<readonly [1, ...string[], 2]>>({} as readonly [1, 2]);
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// Nested Arrays
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expectType<ExcludeRestElement<[[1, 2], ...number[], [3, 4]]>>({} as [[1, 2], [3, 4]]);
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expectType<ExcludeRestElement<[['a'], ...string[], ['z']]>>({} as [['a'], ['z']]);
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// Edge: `never` / `any`
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expectType<ExcludeRestElement<any>>({} as any);
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expectType<ExcludeRestElement<never>>({} as never);
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