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.changeset/sour-cycles-lie.md

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+---
+"@react-router/dev": major
+"react-router": major
+---
+
+- Consolidate types previously duplicated across `@remix-run/router`, `@remix-run/server-runtime`, and `@remix-run/react` now that they all live in `react-router`
+  - Examples: `LoaderFunction`, `LoaderFunctionArgs`, `ActionFunction`, `ActionFunctionArgs`, `DataFunctionArgs`, `RouteManifest`, `LinksFunction`, `Route`, `EntryRoute`
+  - The `RouteManifest` type used by the "remix" code is now slightly stricter because it is using the former `@remix-run/router` `RouteManifest`
+    - `Record<string, Route> -> Record<string, Route | undefined>`
+  - Removed `AppData` type in favor of inlining `unknown` in the few locations it was used
+  - Removed `ServerRuntimeMeta*` types in favor of the `Meta*` types they were duplicated from