What is the meaning of the error message "Property 'vitest' is not found on 'ImportMeta' type" in Vitest in-source testing?

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The error message "Property 'vitest' is not found on 'ImportMeta' type" in Vitest in-source testing suggests that the testing framework is unable to find the 'vitest' property on the 'ImportMeta' object. This could be due to various reasons such as a typo or a missing import statement. The 'ImportMeta' object is part of the ECMAScript 6 specification and represents metadata about a specific module. The 'vitest' property is likely a custom property added by the Vitest framework to allow for in-source testing. To resolve the error, ensure that the 'vitest' property is correctly defined and imported in the module being tested.