## Summary
Now that Twenty has fully migrated from Emotion to Linaria, the theme
system has been simplified to remove unnecessary complexity that existed
only to support the old runtime injection pattern.
### What changed
- **Deleted** `generateThemeConstants.ts` script and the entire
`generated/` directory — no more auto-generation
- **Added** `theme-light.css` and `theme-dark.css`: static CSS files
with 991 custom properties each, scoped under `.light` and `.dark`
selectors respectively
- **Moved** `themeCssVariables.ts` out of `generated/` and hand-maintain
it as a static `as const` object of `var(--t-*)` references (Linaria can
statically evaluate these at build time)
- **Extracted** numeric constants (`MOBILE_VIEWPORT`, `ICON_SIZES`,
`ICON_STROKES`) into a new `constants.ts` — CSS variables can't be used
in media queries or as numeric icon size props
- **Simplified** `ThemeContextProvider`: removed
`ThemeCssVariableInjectorEffect` entirely; now uses a single
`useLayoutEffect` to toggle `.light`/`.dark` class on `<html>`
- **Added** `class="light"` to `index.html` as default to prevent FOUC
before React hydration
### Why
The previous setup maintained a dual system: JS theme objects
(`THEME_LIGHT`/`THEME_DARK`) used at runtime, plus a generation script
that produced CSS variable entry arrays, which were then injected into
the DOM by `ThemeCssVariableInjectorEffect`. With Linaria, theme values
only need to be CSS custom properties — the JS objects were redundant.
This PR removes ~250 lines of infrastructure while keeping the same
theming capabilities.
# Introduction
closes https://github.com/twentyhq/core-team-issues/issues/591
Same than for `twenty-shared` made in
https://github.com/twentyhq/twenty/pull/11083.
## TODO
- [x] Manual migrate twenty-website twenty-ui imports
## What's next:
- Generate barrel and migration script factorization within own package
+ tests
- Refactoring using preconstruct ? TimeBox
- Lint circular dependencies
- Lint import from barrel and forbid them
### Preconstruct
We need custom rollup plugins addition, but preconstruct does not expose
its rollup configuration. It might be possible to handle this using the
babel overrides. But was a big tunnel.
We could give it a try afterwards ! ( allowing cjs interop and stuff
like that )
Stuck to vite lib app
Closed related PRs:
- https://github.com/twentyhq/twenty/pull/11294
- https://github.com/twentyhq/twenty/pull/11203
Charles Bochet