sindresorhus / esm-package.md

I would strongly recommend moving to ESM. ESM can still import CommonJS packages, but CommonJS packages cannot import ESM packages synchronously.

The problem is either Webpack or your Webpack configuration. First, ensure you are on the latest version of Webpack. Please don't open an issue on my repo. Try asking on Stack Overflow or open an issue the Webpack repo.

Read this first. The problem is either Jest (#9771) or your Jest configuration. First, ensure you are on the latest version of Jest. Please don't open an issue on my repo. Try asking on Stack Overflow or open an issue the Jest repo.

If you have decided to make your project ESM ("type": "module" in your package.json), make sure you have "module": "ES2020" in your tsconfig.json and that all your import statements to local files use the .js extension, not .ts or no extension.

Create React App doesn't yet fully support ESM. I would recommend opening an issue on their repo with the problem you have encountered. One known issue is #10933.

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