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Node.js: ESM/CJS dual package – best practices to avoid ecosystem breakage?

Asked
Views 124
Difficulty Intermediate
Node.js ESM CJS Bundling

Maintainers: What’s the most reliable setup for publishing a dual ESM/CJS package in 2025 without breaking consumers?

Questions:

  • Preferred package.json fields (type, exports, main) arrangement?
  • Do you recommend separate builds and conditional exports per environment?
  • How to avoid TS/TS-Node, Jest, and bundlers choking on mixed module formats?

Looking for a minimal, robust template that works with Node 18+, Vite, Jest, and TS.

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