Open source · 2025
ABTestLab
CLI to build and live-preview A/B tests locally, adopted company-wide.
The problem
A/B test developers were writing variations straight into vendor dashboards, with no local tooling, bundling or live reload.
What I built
- Scaffolds websites, tests, touchpoints and variations; bundles JS and SCSS with Rollup.
- Runs single, grouped and multi-touchpoint tests in parallel, for VWO, AB Tasty, Optimizely, Dynamic Yield, Kameleoon and Convert.
- Local WebSocket server pushes rebuilt code to the browser, which checks targeting and goals before showing the variation.
- In-page status panel with search, sort and per-test details, plus a migration script for old projects.
- Ported into the company's shared services repo and used to restructure a 1,700-experiment monorepo onto one scaffold / start / build workflow.
In numbers
- 192 commits
- ~7.9k lines
- Adopted as the company's shared CLI
Stack
- Node.js
- WebSocket
- Rollup
- Sass
- Chokidar
- Commander