Fixes type InvertPatternForExcludeInternal to work with readonly array
#284
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gvergnaud
reviewed
Sep 22, 2024
src/types/InvertPattern.ts
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| ? i extends any[] | ||
| ? InvertPatternForExcludeInternal<subpattern, ii, empty>[] | ||
| : readonly InvertPatternForExcludeInternal<subpattern, ii, empty>[] |
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Stylistic: There's a pattern of using MaybeAddReadonly<T> in this file that I think we should keep:
Suggested change
| ? i extends any[] | |
| ? InvertPatternForExcludeInternal<subpattern, ii, empty>[] | |
| : readonly InvertPatternForExcludeInternal<subpattern, ii, empty>[] | |
| ? MaybeAddReadonly< | |
| InvertPatternForExcludeInternal<subpattern, ii, empty>[], | |
| IsReadonlyArray<i> | |
| > |
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@gvergnaud
it looks good! Included it in this commit 979b358
tests/lists.test.ts
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| it('issue #271: P.array should support readonly arrays as its input', () => { | ||
| type Input = string | Date | readonly string[]; | ||
| const input = ['a', 'b', 'c'] as Input; | ||
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|
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| const output = match(input) | ||
| .with(P.array(P.string), (value) => 2) | ||
| .with(P.string, (value) => 1) | ||
| .with(P.instanceOf(Date), (value) => 3) | ||
| .exhaustive(); | ||
| }); |
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Could you move this unit test to the exhaustive-match.test.ts file?
I think this is technically a bug of exhaustiveness checking, since the problem is that without this change, the match expression isn't considered exhaustive.
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@gvergnaud Sure! I moved it in this commit 980e4d0
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This PR resolves the issue #271
Fixed the issue by modifying
InvertPatternForExcludeInternalto considerreadonly.