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Modernizing packages to ESM (JS Party #290)

Sep 1, 2023
01:05:15
Snipd AI
Mark Erikson joins to talk about the shift from CommonJS to ESM. They discuss the history of module patterns in JS, challenges of publishing packages and the need for standards in package publishing. The chapter also explores the ongoing relevance and benefits of CommonJS in package modernization.
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Podcast summary created with Snipd AI

Quick takeaways

  • The challenges faced in modernizing node packages to support ESM, including issues with different tools and environments, mismatches between runtime behavior and TypeScript types, and complexities of the React server components environment.
  • Issues app developers encounter when modernizing node packages to support ESM, such as import errors, library authors switching to ESM-only releases, and the need to maintain compatibility by reverting to previous library versions.

Deep dives

Challenges of Modernizing Node Packages to use ESM

The podcast episode discusses the challenges faced by Mark Erickson, a maintainer, in modernizing his node packages to use ESM (ECMAScript Modules). The episode highlights how JavaScript lacked a built-in way to define packages or reusable modules, unlike other languages like Java or Python. This led to the development of community-defined specs such as AMD (Asynchronous Module Definition) and CommonJS module format. Eventually, ES modules were incorporated into the ES 2015 spec. The episode explores the difficulties in handling the transition to ESM, including issues with different tools and environments, mismatches between runtime behavior and TypeScript types, and the complexities of the React server components environment. The episode also touches on the friction experienced by developers relying on libraries with different module formats and the need for documentation and standards to mitigate these challenges.

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