undefinedDeprecated: use node-modules-inspector instead.

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are-we-esm

CLI to check your project’s ESM support status

Usage

Run the following command in your project root:

pnpx are-we-esm

[!NOTE]
Only works with pnpm projects

Options

• --simple - Simplified the module type to CJS and ESM. Consider DUAL as ESM, FAUX as CJS (default: false)
• --prod - Check only the production dependencies
• --dev - Check only the development dependencies
• --exclude - Exclude packages from the check, e.g. --exclude="eslint,eslint-*,@eslint/*"
• --all - Print all packages, including those that are ESM compatible (default: false)
• --list - Print the flat list of packages, instead of tree (default: false)
• --depth - Limit the depth search of the tree (default: 25)

TODOs

• Add progress bar
• Cache the result to disk
• Improve --prod Improve `--prod` flag by traversing the tree
• Support exclude list
• Summary how top-level packages are contribute to ESM support
• Web UI

Sponsors

Credits

Thanks to the following projects and their authors for inspiration:

• The ESM/CJS detection logic is modified from this project by @wooorm.

License

MIT License © 2025-PRESENT Anthony Fu