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/postcss-custom-properties/dist/index.d.ts

@@ -0,0 +1,16 @@
+import type { PluginCreator } from 'postcss';
+import type { ImportOptions, ExportOptions } from './lib/options';
+export interface PluginOptions {
+    /** Do not emit warnings about "importFrom" and "exportTo" deprecations */
+    disableDeprecationNotice?: boolean;
+    /** Determines whether Custom Properties and properties using custom properties should be preserved in their original form. */
+    preserve?: boolean;
+    /** Specifies sources where Custom Properties can be imported from, which might be CSS, JS, and JSON files, functions, and directly passed objects. */
+    importFrom?: ImportOptions | Array<ImportOptions>;
+    /** Specifies destinations where Custom Properties can be exported to, which might be CSS, JS, and JSON files, functions, and directly passed objects. */
+    exportTo?: ExportOptions | Array<ExportOptions>;
+    /** Specifies if `importFrom` properties or `:root` properties have priority. */
+    overrideImportFromWithRoot?: boolean;
+}
+declare const creator: PluginCreator<PluginOptions>;
+export default creator;

node_modules/postcss-custom-properties/dist/lib/get-custom-properties-from-imports.d.ts

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+import type { ImportOptions } from './options';
+import valuesParser from 'postcss-value-parser';
+export default function getCustomPropertiesFromImports(sources: Array<ImportOptions>): Promise<Map<string, valuesParser.ParsedValue>>;

node_modules/postcss-custom-properties/dist/lib/get-custom-properties-from-root.d.ts

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+import valuesParser from 'postcss-value-parser';
+export default function getCustomPropertiesFromRoot(root: any, opts: any): Map<string, valuesParser.ParsedValue>;

node_modules/postcss-custom-properties/dist/lib/is-ignored.d.ts

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+import type { Container, Declaration } from 'postcss';
+declare function isBlockIgnored(container: Container): any;
+declare function isDeclarationIgnored(decl: Declaration): boolean;
+export { isBlockIgnored, isDeclarationIgnored, };

node_modules/postcss-custom-properties/dist/lib/options.d.ts

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+export declare type ImportFromSource = {
+    from: string;
+    type?: string;
+} | string;
+export declare type ImportCustomProperties = {
+    customProperties?: Record<string, string>;
+    'custom-properties'?: Record<string, string>;
+};
+export declare type ImportAsFunction = () => ImportFromSource | ImportCustomProperties;
+export declare type ImportAsPromise = Promise<ImportFromSource | ImportCustomProperties>;
+export declare type ImportAsFunctionPromise = () => Promise<ImportFromSource | ImportCustomProperties>;
+export declare type ImportOptions = ImportFromSource | ImportCustomProperties | ImportAsFunction | ImportAsPromise | ImportAsFunctionPromise;
+export declare type ExportJSONFunction = (customProperties?: Record<string, string>) => Record<string, string>;
+export declare type ExportToSource = {
+    to: string;
+    type?: string;
+    toJSON: ExportJSONFunction;
+} | string;
+export declare type ExportCustomProperties = {
+    customProperties?: Record<string, string>;
+    'custom-properties'?: Record<string, string>;
+    toJSON: ExportJSONFunction;
+};
+export declare type ExportAsFunction = (ExportCustomProperties: any) => void;
+export declare type ExportAsFunctionPromise = (ExportCustomProperties: any) => Promise<void>;
+export declare type ExportOptions = ExportToSource | ExportCustomProperties | ExportAsFunction | ExportAsFunctionPromise;

node_modules/postcss-custom-properties/dist/lib/transform-properties.d.ts

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+declare const _default: (decl: any, customProperties: any, opts: any) => void;
+export default _default;

node_modules/postcss-custom-properties/dist/lib/transform-value-ast.d.ts

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+export default function transformValueAST(root: any, customProperties: any): any;

node_modules/postcss-custom-properties/dist/lib/write-custom-properties-to-exports.d.ts

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+import type { ExportOptions } from './options';
+export default function writeCustomPropertiesToExports(customProperties: any, destinations: Array<ExportOptions>): Promise<void[]>;