🔧 migrate eslint to flat config

eslint.config.ts

@@ -0,0 +1,73 @@
+import { defineConfig, globalIgnores } from "eslint/config";
+import tseslint from "typescript-eslint";
+import globals from "globals";
+import js from "@eslint/js";
+import react from "eslint-plugin-react";
+import reactHooks from "eslint-plugin-react-hooks";
+import importPlugin from "eslint-plugin-import";
+// @ts-expect-error: no types provided
+import jsxA11y from "eslint-plugin-jsx-a11y";
+import docusaurus from "@docusaurus/eslint-plugin";
+import regexp from "eslint-plugin-regexp";
+import prettier from "eslint-config-prettier/flat";
+
+import rules from "./eslint.rules";
+
+const plugins = defineConfig([
+  js.configs.recommended,
+  tseslint.configs.recommended,
+  react.configs.flat.recommended,
+  reactHooks.configs.flat.recommended,
+  importPlugin.flatConfigs.recommended,
+  jsxA11y.flatConfigs.recommended,
+  regexp.configs["flat/recommended"],
+  prettier,
+
+  // The published @docusaurus/eslint-plugin doesn't provide a flat config yet
+  // This adapts its legacy "all" config to flat config
+  {
+    plugins: {
+      "@docusaurus": docusaurus,
+    },
+    rules: docusaurus.configs.all.rules,
+  },
+]);
+
+const ignores = globalIgnores([
+  "**/dist/**",
+  "**/lib/**",
+  "**/build/**",
+  "**/.docusaurus/**",
+  "node_modules",
+  ".yarn",
+  ".history",
+  "coverage",
+]);
+
+export default defineConfig(plugins, rules, ignores, {
+  languageOptions: {
+    ecmaVersion: 2022,
+    sourceType: "module",
+    globals: {
+      ...globals.browser,
+      ...globals.node,
+      ...globals.commonjs,
+      JSX: true,
+    },
+  },
+
+  settings: {
+    "import/resolver": {
+      node: {
+        extensions: [".js", ".jsx", ".ts", ".tsx"],
+      },
+    },
+    react: {
+      version: "19",
+    },
+  },
+
+  linterOptions: {
+    reportUnusedDisableDirectives: true,
+  },
+});