Show HN: Pure Effect – Reproduce production bugs on your laptop without a DB
Pure EffectTypeScriptJavaScripteffect libraryI/O operationsdebuggingtesting
Author: tie-in
Date: 6/21/2026
Article Summary:
The author introduces Pure Effect, a tiny TypeScript/JavaScript effect library that helps write pure functions by describing the I/O operations they want to perform, making it easier to debug and test code.