When I execute a JavaScript file in WebStorm, it shows an error message stating that importing statements are not allowed outside modules.

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This error message is raised when you have import statements in a regular JavaScript file, which is not a module. To resolve this issue, you can either convert your file to a module or remove the import statements.

To convert your file to a module, you need to add the type="module" attribute to your script tag in your HTML file. This will enable your JavaScript file to be treated as a module and allow you to use import statements.

Alternatively, if you do not want to use modules, you can remove the import statements and directly include the code in your JavaScript file.