How to Fix Uncaught SyntaxError: Cannot use import statement outside a module in Three.js?

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Understanding the Error

Ensure Your File Is a Module

The simplest way to make sure your JavaScript file is treated as a module is by adding the type="module" attribute to your <script> tag:

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Make sure to adapt all your file imports accordingly, using the .js extension explicitly:

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Using a Bundler

Tools like Webpack or Rollup can bundle your modules, removing the need for direct browser compatibility:

Webpack Example:

Install webpack and necessary loaders:

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Run the build script:

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This ensures that webpack handles the module imports and outputs a browser-compatible script.

Local Development Server

Using a local development server can also resolve this issue temporarily. For example, tools like live-server or http-server allow for easier handling of import/export statements in a local development environment.

Install and use live-server:

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Run live-server in your project directory:

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Conclusion

Happy coding!