Add changeset

Author: kdaviduik

.changeset/remove-remix-oxygen-package.md

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+---
+'@shopify/hydrogen': minor
+'@shopify/cli-hydrogen': patch
+'@shopify/create-hydrogen': patch
+---
+
+Remove `@shopify/remix-oxygen` package and migrate to React Router 7
+
+This change removes the `@shopify/remix-oxygen` package as part of Hydrogen's migration from Remix to React Router 7 + Vite. The package had become a thin wrapper that mostly re-exported React Router functionality.
+
+## Breaking Changes
+
+The `@shopify/remix-oxygen` package has been removed. Update your imports:
+
+**Before:**
+```typescript
+import {LoaderFunctionArgs, redirect} from '@shopify/remix-oxygen';
+import {createRequestHandler} from '@shopify/remix-oxygen';
+```
+
+**After:**
+```typescript
+import {LoaderFunctionArgs, redirect} from 'react-router';
+import {createRequestHandler} from '@shopify/hydrogen/oxygen';
+```
+
+## What's Changed
+
+- **Type exports**: All types like `LoaderFunctionArgs`, `ActionFunctionArgs`, `HeadersFunction`, etc. are now imported directly from `react-router`
+- **Utility functions**: Functions like `redirect`, `json`, and `defer` are now imported from `react-router`
+- **Request handler**: The `createRequestHandler` function for Oxygen deployments is now available from `@shopify/hydrogen/oxygen`
+- **Storefront headers**: The `getStorefrontHeaders` utility is now exported from `@shopify/hydrogen`
+
+## Migration Required
+
+All projects using `@shopify/remix-oxygen` need to update their imports. The skeleton template and examples have been updated to use the new import paths.
+
+The functionality remains the same - this is primarily an import path change to align with React Router 7 and reduce unnecessary abstraction layers.