Module Federation, How do we create unit tests for distributed code?!

Zack Jackson
4 min readApr 23, 2021

The curious case of Module Federation and how do we write tests for federated applications.

If you haven't heard by now — Module Federation is a way to simply import() other modules/files between independently compiled and deployed bundles at runtime.

Possibilities are endless, especially after working with it for over a year. Before there was even an npm release, it was in production, installing directly from a branch on GitHub. It’s immensely more powerful then most think

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Zack Jackson

Infra Architect @ ByteDance. Creator of Module Federation. Specializing in Bundler and Javascript Orchestration at scale.