Modernizing Redux Packages to ES Modules: A Journey of Compatibility

2023/08/08

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The article recounts the author's experience in modernizing the Redux packages to ES Modules (ESM) for better compatibility. Over the years, the JavaScript ecosystem has been transitioning towards using ESM as the default approach for publishing and using JS code. The author highlights the challenges faced in this process, including the lack of a comprehensive guide on how to publish a JS package correctly. They discuss the nuances and behavior quirks of different build tools and runtime environments. The article provides insights into the package formatting configurations that worked well for the Redux family of libraries. It covers topics such as file formats, ESM/CJS interop, package.exports, TS types versions, tree shaking, compatibility issues, and support for specific build tools. Although not an authoritative guide, the article offers valuable information and lessons learned. It also mentions additional resources on the history and arguments surrounding the ESM spec. This article is a must-read for developers looking to modernize their packages and ensure compatibility in the evolving JS ecosystem.