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/**
 * Get JSON string representation of an item.
 * @param item - Unknown input.
 * @returns JSON string of item.
 */
export declare function getJSONString(item: unknown): string;
/**
 * Check whether a string value is null, undefined, empty or whitespace.
 * @param value - String input.
 * @returns Boolean value representing whether the string value is null, undefined, empty or whitespace.
 */
export declare function isNullOrWhiteSpace(value: string | null | undefined): boolean;
/**
 * Check whether a value is an object.
 * @param value - Value to check.
 * @returns Boolean value representing whether the value is an object.
 */
export declare function isObject(value: unknown): value is object;
/**
 * Recursively traverse a directory and execute an action on the underlying files.
 * @param directory - Directory to traverse.
 * @param action - Action to execute on the files.
 */
export declare function traverseDirectory(directory: string, action: (absolutePath: string) => unknown): void;
/**
 * Get Base URL.
 * @param protocol - Protocol.
 * @param hostname - Server hostname.
 * @param port - Server port number.
 * @returns Base URL as string.
 */
export declare function getBaseUrl(protocol: string, hostname: string, port?: number): string;
/**
 * Remove symbols like `\n`, `\r` and `\t` from a string.
 * @param value - Value to remove symbols from.
 * @returns Value with symbols removed.
 */
export declare function removeSymbols(value: string): string;
/**
 * Check whether a path is of a file.
 * @param path - Path to check.
 * @returns Boolean value representing whether the path is of a file.
 */
export declare function isFile(path: string): boolean;
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