#ESM • 2 Articles
Articles tagged with #ESM
A curated list of engineering series, deep dives, and notes related to #ESM.
Engineering Vitest Internals & Modern Testing Architecture • Part 2 2026-09-15
The Vite Module Graph & On-Demand Transformation in Unit Testing
Learn how Vitest leverages Vite's module graph, SSR transformation, and esbuild pipeline for rapid unit testing.
Engineering Vitest Internals & Modern Testing Architecture • Part 1 2026-09-11
Why Jest Slows Down at Scale: Dual Module Graphs & ESM Interop Bottlenecks
Examine the technical causes of Jest test suite slowdowns: CommonJS transformations, custom module resolution, and memory leaks.