Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/eslint-module-utils/ModuleCache.d.ts

@@ -0,0 +1,22 @@
+import type { ESLintSettings } from "./types";
+
+export type CacheKey = unknown;
+export type CacheObject = {
+    result: unknown;
+    lastSeen: ReturnType<typeof process.hrtime>;
+};
+
+declare class ModuleCache {
+    map: Map<CacheKey, CacheObject>;
+
+    constructor(map?: Map<CacheKey, CacheObject>);
+
+    get<T>(cacheKey: CacheKey, settings: ESLintSettings): T | undefined;
+
+    set<T>(cacheKey: CacheKey, result: T): T;
+
+    static getSettings(settings: ESLintSettings): { lifetime: number } & Omit<ESLintSettings['import/cache'], 'lifetime'>;
+}
+export default ModuleCache;
+
+export type { ModuleCache }