Composition Is All You Need | Fernando Rojo at React Universe Conf 2025 YouTube video by Callstack

A must see: youtu.be/4KvbVq3Eg5w?...
I don’t know how many times I’ve tried to explain the concept and usefulness of composition in React → now I just have to forward this video

And the best part: there’s a skill for it.

github.com/vercel-labs/...

Thanks @rojo.bsky.social 🙏

React Native's Major 2025 Updates: Mix Blend Mode, CSS Animations, SwiftUI YouTube video by Fernando Rojo

New YouTube video reacting to this week’s updates in React Native:

→ Mix blend mode, display: contents in RN 0.77
→ CSS Transitions in Reanimated 4
→ Secretly-released SwiftUI support?

youtu.be/3V43hhMIUXE

GitHub - paramsinc/params-templates Contribute to paramsinc/params-templates development by creating an account on GitHub.

github.com/paramsinc/params-templates is the new URL

Just updated the name to params-templates

How does it manage to do this? Presumably you have to render each item to know its height for initialScrollIndex, right?

Very exciting. How good is support for setting the initial index to scroll to when items are of variable size?

I learned React Native as a web developer, and I got everything wrong Mistakes I made building with React Native.

New blog post: I learned React Native as a web developer, and I got everything wrong fernandorojo.co/mistakes

Expo DOM is the coolest feature I’ve seen in so long. I have to make a video on this

Whenever I spend a few days building a screen for just the web, I see how far ahead CSS still is

I wish React Native had em units for styling text.

I need letter-spacing: ‘-.03em’

Bluesky desperately needs a context menu when I long press an image to let me copy it. Same goes for posts themselves. Let me long press

Has anyone written a script to let me find my Twitter people on Bluesky

What do you use to measure this with RN?

zeego.dev for menus, moti.fyi for animations, burnt for toasts

I’m biased since these are mine, but the reception towards them all has been great. Steer clear of native elements that get rebuilt with JS.

PS I’m writing a blog post on the mistakes I made coming to native from a web background

I wonder if you could do:

Parent:
- overflow: hidden
- transform: scaleX

Child:
- position: absolute
- opposite scaleX to offset the parent

Never know if this is correct but it kinda works to just set it on iOS lol

behavior=platform.select({ ios: ‘padding’ })

In my experience you can only do this with local images, since it includes height/width in the source prop next to uri

just setting up my bsky