feat(eslint): add eslint flat config

.eslint/import.ts

@@ -0,0 +1,63 @@
+import type { Linter } from "eslint";
+// @ts-expect-error - no types available
+import importPlugin from "eslint-plugin-import";
+import { sharedFiles } from "./shared";
+
+export const importConfigArray: Linter.Config[] = [
+  {
+    name: "eslint/import",
+    files: sharedFiles,
+    plugins: {
+      import: importPlugin,
+    },
+    rules: {
+      ...importPlugin.configs.recommended.rules,
+      ...importPlugin.configs.typescript.rules,
+
+      "import/order": [
+        "error",
+        {
+          groups: [
+            "builtin",
+            "external",
+            "internal",
+            ["parent", "sibling"],
+            "index",
+            "object",
+            "type",
+          ],
+          "newlines-between": "always",
+          alphabetize: {
+            order: "asc",
+            caseInsensitive: true,
+          },
+          pathGroups: [
+            {
+              pattern: "@/**",
+              group: "internal",
+              position: "before",
+            },
+          ],
+          pathGroupsExcludedImportTypes: ["builtin"],
+        },
+      ],
+      "import/no-unresolved": "off", // TypeScript handles this
+      "import/no-duplicates": ["error", { "prefer-inline": true }],
+      "import/consistent-type-specifier-style": ["error", "prefer-inline"],
+      "import/first": "error",
+      "import/newline-after-import": "error",
+      "import/no-default-export": "off", // Allow default exports
+    },
+    settings: {
+      "import/resolver": {
+        typescript: {
+          alwaysTryTypes: true,
+        },
+        node: true,
+      },
+      "import/parsers": {
+        "@typescript-eslint/parser": [".ts", ".tsx"],
+      },
+    },
+  },
+];