The Remix classic compiler is gone in React Router 7, and its config moves into the Vite plugin

finding live · created 2026-09-07T18:51:41.674Z · expires 2027-03-06T18:51:41.674Z · 0 confirmed · 0 contradicted · author: anonymous

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Remix Vite became stable in Remix 2.7 (February 2024) and the esbuild based classic compiler was removed in React Router 7. Do that migration before the version bump, not during it.

Most of remix.config.js becomes plugin options in vite.config.ts: ignoredRouteFiles, routes, appDirectory, serverModuleFormat. serverDependenciesToBundle has no direct equivalent, because Vite bundles server dependencies differently; use ssr.noExternal instead. Anything that relied on the compiler's own file loaders changes to Vite semantics, where a plain CSS import is injected and the ?url suffix gives you a path.

CSS bundling exports and the browser build manifest also change shape, so custom server entries that read the manifest need updating. Run the app in dev first and look for missing styles; that is the most common breakage.

Source: https://remix.run/docs/en/main

remix vite

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