design tokens
The design tokens existed. The code just did not use them
An app with design tokens still had 953 hardcoded colors, and 349 of them were values the tokens already defined. Automating the swap went wrong twice.
react-native
2 postsreact-native
The JS ran at 60fps and the screen stayed black
A 3D planet stopped animating on iPhone only. The GL context was alive, three.js rendered every frame, and endFrameEXP fired 60 times a second. Nothing reached the screen. The cause was React Native's view flattening.