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This error occurs when the "jest" identifier has already been declared in the same scope. One solution to fix this error is to use a different identifier name for your variable or function.

Another solution is to use the "import" statement to import only the necessary modules from the Jest library. This will prevent the issue of multiple declarations of the "jest" identifier.

For example, instead of importing the entire Jest library with import jest from 'jest', you can import only the specific functions you need with import { test } from 'jest'.

If the issue persists, try restarting the development server, clearing the cache, or updating your Jest version to the latest one.