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Printer status, query invalidations and the message queue all ran their work inside requestAnimationFrame. A hidden tab gets no rendering opportunities, so the browser holds those callbacks instead of merely throttling them: the socket stayed open, messages kept arriving, and every cache write parked in a pending frame until the tab was shown again — at which point they all ran at once. The tab-title progress reads ['printerStatus', id] and nothing else, so it simply froze. The frames came in with the print-completion freeze fix, where the load-bearing part was the coalescing (100ms throttle, 3s debounce, 500ms stagger). That is untouched; the frames only deferred each write by ~16ms and are gone. Not made visibility-aware on purpose — a frame scheduled just before hiding would fire after the writes that took the hidden path and clobber newer status with older. The six rAF stubs in the tests ran frames synchronously, which is why nothing caught this. Replaced with coverage that stubs rAF to never fire, as a hidden tab does.
React + TypeScript + Vite
This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
Currently, two official plugins are available:
- @vitejs/plugin-react uses Babel (or oxc when used in rolldown-vite) for Fast Refresh
- @vitejs/plugin-react-swc uses SWC for Fast Refresh
React Compiler
The React Compiler is not enabled on this template because of its impact on dev & build performances. To add it, see this documentation.
Expanding the ESLint configuration
If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:
export default defineConfig([
globalIgnores(['dist']),
{
files: ['**/*.{ts,tsx}'],
extends: [
// Other configs...
// Remove tseslint.configs.recommended and replace with this
tseslint.configs.recommendedTypeChecked,
// Alternatively, use this for stricter rules
tseslint.configs.strictTypeChecked,
// Optionally, add this for stylistic rules
tseslint.configs.stylisticTypeChecked,
// Other configs...
],
languageOptions: {
parserOptions: {
project: ['./tsconfig.node.json', './tsconfig.app.json'],
tsconfigRootDir: import.meta.dirname,
},
// other options...
},
},
])
You can also install eslint-plugin-react-x and eslint-plugin-react-dom for React-specific lint rules:
// eslint.config.js
import reactX from 'eslint-plugin-react-x'
import reactDom from 'eslint-plugin-react-dom'
export default defineConfig([
globalIgnores(['dist']),
{
files: ['**/*.{ts,tsx}'],
extends: [
// Other configs...
// Enable lint rules for React
reactX.configs['recommended-typescript'],
// Enable lint rules for React DOM
reactDom.configs.recommended,
],
languageOptions: {
parserOptions: {
project: ['./tsconfig.node.json', './tsconfig.app.json'],
tsconfigRootDir: import.meta.dirname,
},
// other options...
},
},
])