Although I don't have the listItems.js file in my src folder, some file is still being imported.

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It's possible that the import statement for listItems.js is located in another file that is being imported or referenced in your code. Check all of the files in your project to see if any of them are importing listItems.js or have a reference to it. Additionally, some build tools or frameworks, such as Webpack or create-react-app, may automatically include certain files even if they are not explicitly imported.