The website's Cloudflare build (`opennextjs-cloudflare` / Turbopack) was
failing with `_defineProperty is not a function` while linaria/wyw
evaluates `twenty-ui/dist/theme.cjs` at build time. It regressed in
#21946, whose twenty-ui build rework changed the emitted `theme.cjs` so
the theme objects ship as runtime object spreads (`{ ...THEME_COMMON
}`).
**Cause:** wyw evaluates modules in Node through `next/babel`, which
pulls in `preset-env` + `transform-runtime`. Those re-lower the runtime
spreads into `@babel/runtime` helpers imported as ESM; wyw then
`require()`s that ESM module in a CJS context where the export is not
callable, so `_defineProperty` fails.
**Fix:** wyw runs in Node and needs no downleveling, so replace
`next/babel` with minimal presets (`@babel/preset-typescript`,
`@babel/preset-react`, `@wyw-in-js/babel-preset`, plus
`@babel/plugin-transform-export-namespace-from`), matching
twenty-front's wyw config. No `@babel/runtime` helpers get injected.
Kept on the website side so twenty-ui keeps react/react-dom as peer deps
(#21946).
Note: no blocking PR check runs the website production build, so this is
best validated via the website preview build or the twenty-infra deploy.
Raphaël Bosi
85406a58fb