Andrew Jarrett @ahrjarrett.bsky.social · 27/09/2025Here's are some resources on property testing/fuzz testing that I've been reading lately: - Property testing in Elixir: propertesting.com - How to identify properties/invariants: fsharpforfunandprofit.com/series/prope... - Using fast-check with Cypress: www.youtube.com/watch?v=E42T... Any others? 000
Andrew Jarrett @ahrjarrett.bsky.social · 27/09/2025Interesting article by @chrispenner.ca about why monads aren't the solution to everything, and a functor I've never crossed paths with called selective applicatives. Still absorbing it, but great read as always. Check it out if that's your thing. chrispenner.ca/posts/expres...chrispenner.caMonads are too powerful: The Expressiveness SpectrumMonads are a useful tool, but what costs do we pay for their expressive power? 031
Andrew Jarrett @ahrjarrett.bsky.social · 25/09/2025This afternoon I was listening to @typescript.fm and was surprised to hear @traversable/valibot mentioned 🤩 As a long time fan of the podcast, this was super fun. 111
Reposted by Andrew JarrettMatthew Miller @iamkale.millerti.me · 23/09/2025This is great news! GitHub will require use of passkeys for 2FA when publishing to NPM. What a huge step up in security compared to other phishable 2FA methods that were historically supported 🎉 github.blog/security/sup...github.blogOur plan for a more secure npm supply chainGitHub is strengthening npm's security with stricter authentication, granular tokens, and enhanced trusted publishing. 03413
Andrew Jarrett @ahrjarrett.bsky.social · 23/09/2025What if deep object comparisons were 10x more performant than they've ever been in JavaScript? Just re-use your Valibot, ArkType, Zod, or TypeBox schema. It even works with JSON Schema. Run the benchmarks yourself: bolt.new/~/mitata-ej4... Library: github.com/traversable/... 010
Andrew Jarrett @ahrjarrett.bsky.social · 20/09/2025I also think the implementation is interesting. The workhorse here is the fold function – all 29 libraries are powered by the same abstraction. 120
Andrew Jarrett @ahrjarrett.bsky.social · 20/09/2025Just shipped a zod transformer that turns a zod schema into a recursive to/from snake/camel case codec. This release also allows users to provide their own key to/from transforms. Available in @traversable/zod@0.0.50. Feedback welcome! cc @colinhacks.com 230
Andrew Jarrett @ahrjarrett.bsky.social · 19/09/2025Writing tests is hard, and I'm lazy. I'd rather write a few invariants, and let fast-check fuzz test the rest. That's why I built @traversable/valibot-test. Here it is in action: 4145
Reposted by Andrew JarrettFabian Hiller @fabianhiller.com · 16/09/2025This is one of the coolest @valibot.dev utility libraries around! 🔥 It can convert Valibot schemas into stringified TypeScript types. It can also check schemas for equality and clone them. Great job, @ahrjarrett.bsky.social! 🪄 Read the full article on @dev.to: dev.to/ahrjarrett/i...dev.toIntroducing: @traversable/valibotA few weeks ago I released a TypeScript library called @traversable/valibot. This post covers what... 2174
