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Demonstration of performance bug in Vitest

  • npm run test - observe that tests are instant
  • npm run test.dot - observe that tests are very slow
  • npm run test.verbose - observe that tests are very slow

Notes: This demo runs an autogenerated test suite with expect(true).toBe(true) and expect(false).toBe(true). Only difference between the different commands is the reporter used. Enabling console based reporters significantly impairs vitest performance (orders of magnitude)