Deprecate eslint config package (#10174)

.changeset/giant-eggs-march.md

@@ -0,0 +1,5 @@
+---
+"@remix-run/eslint-config": minor
+---
+
+Add deprecation warning to `@remix-run/eslint-config`

packages/remix-eslint-config/README.md

@@ -1,5 +1,8 @@
 # `@remix-run/eslint-config`
 
+> [!WARNING]
+> The `@remix-run/eslint-config` package is deprecated and will not be included in React Router v7. We recommend moving towards a streamlined ESLint config such as the ones included in the Remix templates. See https://github.com/remix-run/remix/blob/main/templates/remix/.eslintrc.cjs.
+
 This package includes a shareable ESLint config for Remix projects.
 
 If you create your app with `create-remix` no additional configuration is necessary.

packages/remix-eslint-config/index.js

@@ -14,6 +14,13 @@ const reactSettings = require("./settings/react");
  */
 require("@rushstack/eslint-patch/modern-module-resolution");
 
+console.warn(
+  "⚠️ REMIX FUTURE CHANGE: The `@remix-run/eslint-config` package is deprecated " +
+    "and will not be included in React Router v7.  We recommend moving towards a " +
+    "streamlined ESLint config such as the ones included in the Remix templates. " +
+    "See https://github.com/remix-run/remix/blob/main/templates/remix/.eslintrc.cjs."
+);
+
 const OFF = 0;
 // const WARN = 1;
 // const ERROR = 2;