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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>
56 lines
3.5 KiB
TypeScript
56 lines
3.5 KiB
TypeScript
import {expectType} from 'tsd';
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import type {SplitOnRestElement} from '../index.d.ts';
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// Fixed tuples (No rest element)
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expectType<SplitOnRestElement<[]>>({} as [[], [], []]);
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expectType<SplitOnRestElement<[1]>>({} as [[1], [], []]);
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expectType<SplitOnRestElement<[1, 2, 3]>>({} as [[1, 2, 3], [], []]);
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expectType<SplitOnRestElement<readonly ['a', 'b', 'c']>>({} as readonly [['a', 'b', 'c'], [], []]);
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// Rest elements (true variadic)
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expectType<SplitOnRestElement<[1, ...number[]]>>({} as [[1], number[], []]);
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expectType<SplitOnRestElement<[...string[]]>>({} as [[], string[], []]);
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expectType<SplitOnRestElement<[...never[]]>>({} as [[], never[], []]);
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expectType<SplitOnRestElement<[1, ...number[], 2]>>({} as [[1], number[], [2]]);
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expectType<SplitOnRestElement<['a', ...string[], 'b']>>({} as [['a'], string[], ['b']]);
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expectType<SplitOnRestElement<[...boolean[], string]>>({} as [[], boolean[], [string]]);
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expectType<SplitOnRestElement<[...string[], 'x', 'y']>>({} as [[], string[], ['x', 'y']]);
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expectType<SplitOnRestElement<[...never[], 1]>>({} as [[], never[], [1]]);
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expectType<SplitOnRestElement<[undefined, ...boolean[], null]>>({} as [[undefined], boolean[], [null]]);
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expectType<SplitOnRestElement<[void, ...never[], 1]>>({} as [[void], never[], [1]]);
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expectType<SplitOnRestElement<[null, ...any[], null]>>({} as [[null], any[], [null]]);
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expectType<SplitOnRestElement<[...Array<{id: string}>, number]>>({} as [[], Array<{id: string}>, [number]]);
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expectType<SplitOnRestElement<[1, ...Array<readonly [string, number]>, 2]>>({} as [[1], Array<readonly [string, number]>, [2]]);
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// Generic arrays
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expectType<SplitOnRestElement<string[]>>({} as [[], string[], []]);
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expectType<SplitOnRestElement<number[]>>({} as [[], number[], []]);
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expectType<SplitOnRestElement<unknown[]>>({} as [[], unknown[], []]);
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expectType<SplitOnRestElement<any[]>>({} as [[], any[], []]);
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// Unions
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expectType<SplitOnRestElement<[...Array<string | number>, boolean]>>({} as [[], Array<string | number>, [boolean]]);
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expectType<SplitOnRestElement<[1, 2] | [3, 4]>>({} as [[1, 2], [], []] | [[3, 4], [], []]);
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expectType<SplitOnRestElement<[1, ...number[]] | ['foo', ...string[]]>>({} as [[1], number[], []] | [['foo'], string[], []]);
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// Preserve optional
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expectType<SplitOnRestElement<[0, 1?, 2?, ...never[]]>>({} as [[0, 1?, 2?], never[], []]);
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expectType<SplitOnRestElement<[number?, ...string[]]>>({} as [[number?], string[], []]);
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expectType<SplitOnRestElement<[number, boolean?, ...string[]]>>({} as [[number, boolean?], string[], []]);
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// Remove optional
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expectType<SplitOnRestElement<[0, 1?, 2?, ...never[]], {preserveOptionalModifier: false}>>({} as [[0, 1, 2], never[], []]);
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expectType<SplitOnRestElement<[number?, ...string[]], {preserveOptionalModifier: false}>>({} as [[number], string[], []]);
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expectType<SplitOnRestElement<[number, boolean?, ...string[]], {preserveOptionalModifier: false}>>({} as [[number, boolean], string[], []]);
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// Readonly
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expectType<SplitOnRestElement<readonly []>>({} as readonly [[], [], []]);
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expectType<SplitOnRestElement<readonly [number] | [string]>>({} as readonly [[number], [], []] | [[string], [], []]);
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expectType<SplitOnRestElement<readonly [...number[], 2]>>({} as readonly [[], number[], [2]]);
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expectType<SplitOnRestElement<readonly [1, ...string[], 2] | readonly ['foo'?, ...string[]]>>({} as readonly [[1], string[], [2]] | readonly [['foo'?], string[], []]);
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expectType<SplitOnRestElement<readonly [1, 2, 3]>>({} as readonly [[1, 2, 3], [], []]);
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// Edge: `never` / `any`
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expectType<SplitOnRestElement<any>>({} as any);
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expectType<SplitOnRestElement<never>>({} as never);
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