Original Post: Building an npm package compatible with ESM and CJS in 2024
Developers need to publish JavaScript packages that are compatible with both ECMAScript Modules (ESM) and CommonJS (CJS) to integrate a wide range of libraries. This requires avoiding the use of the `”type: module”` declaration in package.json and utilizing the `main` and `module` fields to differentiate entry points. The `exports` field in package.json controls module resolution, while TypeScript projects can ensure compatibility and type safety by integrating package manifest exports with a module type. By following practical examples and best practices, developers can create dual-compatible libraries that work seamlessly with both ESM and CJS consumers.
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