Cannot use import statement outside a module

I want to import some public functions from another js file. But an error `Cannot use import statement outside a module` happened. How to fix this?

No file, test, or entry point is named. Start by reproducing the import statement error in J2V8 and checking how the JavaScript execution context handles modules. Done means either module imports work through a defined J2V8-supported path or the limitation and required usage are documented.

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