chore(test-runner): vendor the expect library#40301
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dgozman merged 18 commits intomicrosoft:mainfrom Apr 21, 2026
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Inlines the parts of expect@30.2.0 that Playwright actually uses into packages/playwright/src/matchers/expectLibrary.ts. Drops spy matchers, jest snapshot matchers, expect.assertions/hasAssertions, and the public addEqualityTesters API (matcher context keeps customTesters: [] so built-in matcher bodies stay unchanged). Removes the expect, @jest/get-type, and jest-util dependencies; inlines getType, isPrimitive, isPromise locally.
Removes global state plumbing (getState/setState/JEST_MATCHERS_OBJECT), dontThrow(), and unused MatcherState fields (currentTestName, testPath, expand — expand was always false, so isExpand(this.expand) is now just false). Unexports types and helpers that no caller imports.
Removes wrapUnknownMatcherProxy and the matching "helpful expect errors" tests. Accessing a nonexistent matcher now yields the native "is not a function" TypeError instead of a custom message.
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Let's cleanup package.json - sounds like expect is being pulled via packages/playwright/package.json's dev deps - that is not orderly...
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pavelfeldman
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Apr 20, 2026
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Test results for "MCP"3 failed 2 flaky6429 passed, 976 skipped Merge workflow run. |
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Test results for "tests 1"6 flaky41176 passed, 847 skipped Merge workflow run. |
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Test results for "tests 2"2 failed 75 flaky273272 passed, 12555 skipped Merge workflow run. |
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Test results for "tests others"2 fatal errors, not part of any test 18674 passed, 617 skipped, 838 did not run Merge workflow run. |
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Summary
expectlibrary (v30.2.0) intopackages/playwright/src/matchers/expectLibrary.ts, adapted and trimmed to Playwright's needs.expect.tsrewritten on top of the vendored library, no more proxies, global variables, smaller interface into the test runner, etc.