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/jest-config/build/utils.d.ts

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+import type { Config } from '@jest/types';
+declare type ResolveOptions = {
+    rootDir: Config.Path;
+    key: string;
+    filePath: Config.Path;
+    optional?: boolean;
+};
+export declare const BULLET: string;
+export declare const DOCUMENTATION_NOTE: string;
+export declare const resolve: (resolver: string | null | undefined, { key, filePath, rootDir, optional }: ResolveOptions) => string;
+export declare const escapeGlobCharacters: (path: Config.Path) => Config.Glob;
+export declare const replaceRootDirInPath: (rootDir: Config.Path, filePath: Config.Path) => string;
+declare type OrArray<T> = T | Array<T>;
+declare type ReplaceRootDirConfigObj = Record<string, Config.Path>;
+declare type ReplaceRootDirConfigValues = OrArray<ReplaceRootDirConfigObj> | OrArray<RegExp> | OrArray<Config.Path>;
+export declare const _replaceRootDirTags: <T extends ReplaceRootDirConfigValues>(rootDir: Config.Path, config: T) => T;
+declare type JSONString = string & {
+    readonly $$type: never;
+};
+export declare const isJSONString: (text?: string | JSONString | undefined) => text is JSONString;
+export {};