npm-package-develop

Dual ESM and CJS publishing requires configuring the package.json exports map to define distinct entry points for each format. This Skill guides setting up the exports structure, TypeScript configuration, and bundler outputs to ensure both module systems resolve correctly.

The exports map is a package.json field defining how module entry points resolve across environments. It maps specific import paths to ESM or CJS files, ensuring consumers receive the correct format for their runtime while preventing deep import access.

Setting up TypeScript and tsup involves configuring tsconfig module resolution options and using tsup to bundle ESM and CJS outputs. This Skill provides the necessary configuration steps, bundler setup, and prepublish scripts to generate dual-format builds.

Yes, this Skill applies to both library authors and CLI tools needing dual-format support. It tailors TypeScript configuration, exports maps, and publishing pipelines specifically for CLI tools requiring ESM and CJS compatibility.

Automating npm package publishing requires setting up prepublish scripts and CI-ready workflows to validate release quality. This Skill guides configuring automated publishing pipelines and publishing-quality checks to ensure releases are validated before deployment.