Add unit tests for uncovered modules

[staging-devin-ai-integration]

Summary

Adds comprehensive unit tests for previously uncovered modules, bringing the test count from 6 to 84. New test files cover:

• runtime.test.ts (30 tests): createRuntimeTw proxy — basic classes, chained classes, underscore-to-hyphen conversion, $ to @// conversion, variant modifiers (hover, md, dark, nested), important(), raw(), variant(), arbitrary values, slash-separated values, typewind_id symbol, Symbol.toPrimitive/toString/valueOf, string property delegation (length, includes, split), getPrototypeOf trap, complex multi-variant combinations.

• cn.test.ts (10 tests): cn() utility — tailwind-merge conflict resolution, falsy values, empty calls, arrays, conditional classes, object syntax, typewind proxy integration via typewind_id, mixed inputs.

• evaluate.test.ts (19 tests): createTw with live tailwind context — mirrors runtime tests but exercises the evaluate module's candidateRuleMap/variantMap-based proxy (classes, variants, important, raw, variant helper, arbitrary values, symbol access, complex expressions). Uses jest.isolateModules to avoid cross-test module cache contamination.

• utils.test.ts (7 tests): loadConfig (default config shape) and createTypewindContext (returns Map-based candidateRuleMap/variantMap with standard Tailwind utilities and variants, throws on missing config).

• typewindTransforms.test.ts (2 tests): Verifies the typewindTransforms export shape (tsx/ts/jsx/js keys).

• transform.test.ts (4 new tests added): Edge cases — no-tw passthrough, multiple tw expressions, js/jsx extension handling.

Also updated jest.config.js to use explicit ts-jest configuration with esModuleInterop: true, enabling direct source file imports in tests.

Review & Testing Checklist for Human

• Run npm test and verify all 84 tests pass
• Confirm the jest.config.js change (switching from preset: 'ts-jest' to explicit transform config with esModuleInterop) doesn't affect any other tooling in your workflow
• Spot-check that the new snapshot entries in transform.test.ts.snap look correct for the added edge case tests

Notes

• The evaluate.test.ts uses jest.isolateModules for each test to avoid the top-level createTypewindContext() call in evaluate.ts from caching a single tailwind config across test runs.
• All test files use __dirname-based paths instead of process.cwd() to be resilient to cross-file cwd changes from other test suites.
• The typewindTransforms.test.ts intentionally only tests the export shape (not actual transforms) to avoid caching the dist evaluate module with a config that lacks plugins needed by other fixture tests (e.g., @tailwindcss/container-queries).

Link to Devin session: https://staging.itsdev.in/sessions/f530a193b53f4c1192e5d1eb7bb7f27e
Requested by: @Mokshit06

[staging-devin-ai-integration]

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Project	Deployment	Actions	Updated (UTC)
typewind	Error		Apr 8, 2026 6:41pm