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feat: add the .toBeInstantiableWith() matcher#399

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mrazauskas merged 46 commits intomainfrom
add-toBeInstantiableWith
Mar 2, 2026
Merged

feat: add the .toBeInstantiableWith() matcher#399
mrazauskas merged 46 commits intomainfrom
add-toBeInstantiableWith

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@mrazauskas mrazauskas commented Jan 4, 2025 •
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Adding the .toBeInstantiableWith() matcher, which will be able to check if the generic type can be instantiated with the given type arguments.

import { type _, expect } from "tstyche";

interface Matchers<R, T = unknown> {
  [key: string]: (expected: T) => R;
}

expect<Matchers<_>>().type.toBeInstantiableWith<[void]>();
expect<Matchers<_>>().type.toBeInstantiableWith<[void, string]>();

expect<Matchers<_>>().type.not.toBeInstantiableWith<[]>();

Also the _ type is added which is useful to fill in the required type arguments of generic types.

The matcher handles generic type aliases, interfaces, functions and classes.

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codacy-production bot commented Jan 4, 2025 •
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Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation Diff coverage
✅ +0.05% (target: -1.00%) ✅ 98.90% (target: 85.00%)
Coverage variation details
Coverable lines Covered lines Coverage
Common ancestor commit (ba28c48) 7400 7283 98.42%
Head commit (bfaf2c7) 7562 (+162) 7446 (+163) 98.47% (+0.05%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details
Coverable lines Covered lines Diff coverage
Pull request (#399) 182 180 98.90%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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@mrazauskas mrazauskas force-pushed the main branch 2 times, most recently from c5ee149 to a50b57f Compare January 19, 2025 08:32
@mrazauskas mrazauskas force-pushed the main branch 2 times, most recently from 0c41123 to 8d26a31 Compare June 9, 2025 08:34
@mrazauskas mrazauskas force-pushed the main branch 4 times, most recently from c55203f to 2df744e Compare June 11, 2025 17:59
@mrazauskas mrazauskas force-pushed the main branch 2 times, most recently from 75286b6 to 6fb1277 Compare August 16, 2025 05:19
@mrazauskas mrazauskas marked this pull request as ready for review March 2, 2026 08:56
@mrazauskas mrazauskas enabled auto-merge (squash) March 2, 2026 12:31
@mrazauskas mrazauskas merged commit 0ee3a2c into main Mar 2, 2026
37 of 38 checks passed
@mrazauskas mrazauskas deleted the add-toBeInstantiableWith branch March 2, 2026 12:39
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@mrazauskas