Chore: move to eslint (#6270)

eslint.config.mjs

@@ -0,0 +1,69 @@
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+import { fixupConfigRules } from "@eslint/compat";
+import { FlatCompat } from "@eslint/eslintrc";
+import js from "@eslint/js";
+import prettier from "eslint-plugin-prettier";
+import { defineConfig, globalIgnores } from "eslint/config";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all,
+});
+
+export default defineConfig([
+  {
+    extends: fixupConfigRules(compat.extends("next/core-web-vitals", "prettier", "plugin:react-hooks/recommended")),
+
+    plugins: {
+      prettier,
+    },
+
+    languageOptions: {
+      ecmaVersion: 6,
+      sourceType: "module",
+
+      parserOptions: {
+        ecmaFeatures: {
+          modules: true,
+        },
+      },
+    },
+
+    settings: {
+      "import/resolver": {
+        node: {
+          paths: ["src"],
+        },
+      },
+    },
+
+    rules: {
+      "import/no-cycle": [
+        "error",
+        {
+          maxDepth: 1,
+        },
+      ],
+
+      "import/order": [
+        "error",
+        {
+          "newlines-between": "always",
+        },
+      ],
+
+      "no-else-return": [
+        "error",
+        {
+          allowElseIf: true,
+        },
+      ],
+    },
+  },
+  globalIgnores(["./config/", "./.venv/", "./.next/", "./site/"]),
+]);