iiinova — where your digital self keeps evolving

fast-check

@fast-check.dev

228 followers 27 following 199 posts

🎲 Property-based testing for JavaScript and TypeScript compatible with Vitest, Jest and others · Official website at fast-check.dev · Made with ♥️ by @nicolas.dubien.me

Posts Replies Media

fast-check @fast-check.dev · 14/09/2026

🫣 Short trailer for v5? Let's have a sneak peek at the upcoming next major version of fast-check!

031

fast-check @fast-check.dev · 11/09/2026

🚀 New release! Version 4.10.0 is out. 🫣 Get prepared for the upcoming v5.

Image to advertise the release of 4.10.0 of fast-check.

It says:
PREPARE FOR v5.
New plugin API and deprecation notices. v5 is still ahead.

Image build with the help of ChatGPT

061

fast-check @fast-check.dev · 04/05/2026

🤫 Direct link to tangled from our documentation

010

fast-check @fast-check.dev · 20/03/2026

🎲 New release of pure-rand, our internal dependency. With 33% increase in bundle size but for the right cause: we want to provide users with ways to jump on Mersenne Twister generators. It has been a long PR started 6 years ago and that finally made it.

0131

fast-check @fast-check.dev · 05/03/2026

🚀 This is it: version 8.0.0 of pure-rand is out! 📦 Lighter bundle 🛢️ No more barrel files 🧹 Simplified API by default npmx.dev/package/pure...

092

fast-check @fast-check.dev · 01/02/2026

🚀 Here is a very first version of our "JavaScript testing expert". There are still a LOT of missing guidelines. We still want to cover basics of UI testing with testing-library and @vitest.dev with @playwright.dev but soon... First let's play with it 🤞

240

fast-check @fast-check.dev · 18/01/2026

Currently in fast-check, when you check a synchronous predicate the assertion is synchronous but when checking an asynchronous one it becomes asynchronous and requires another helper to be called. What if it was always asynchronous? But with the benefit of always calling fc.property 🤔

132

fast-check @fast-check.dev · 07/02/2025

Just added a banner on top of the documentation to make it clear 👍

110

fast-check @fast-check.dev · 31/12/2024

Happy New Year 🎆

030

fast-check @fast-check.dev · 18/12/2024

🎅✨ Advent of PBT 2024 · Day 18 ✨🎅 Santa’s journey-planning algorithm is live, but can it truly optimize his route? This year, every kilometer counts, and potential delays could risk Christmas! Ensure Santa’s path is optimal 🏠➡️🎁 👉 Dive into today’s puzzle: fast-check.dev/blog/2024/12...

In the foreground, we can see a screen showing the journey that Santa is planning to do with a map having points representing the houses he plans to visit in this specific trip.

In the background, we see Santa on his sleigh and ready to go!

(AI generated image)

100

fast-check @fast-check.dev · 16/12/2024

🎄 Day 16: Debugging Santa Codes! 🎅 Santa’s new counting system ensures every number differs by exactly one bit. Ingenious—but are the elves' algorithms bug-free? 🛠️ Can you find an input that breaks their "flawless" implementation? Christmas is in your hands! ✨ 👉 fast-check.dev/blog/2024/12...

021

fast-check @fast-check.dev · 15/12/2024

🎄 Day 15: Santa’s Shelf Shenanigans! 🎅 Santa replaced his trusty conveyor belts with a new shelf system—but something’s not quite right. Can you uncover the edge cases in how toys are placed and retrieved? Christmas depends on your testing skills! 🛠️✨ 👉 fast-check.dev/blog/2024/12...