/**
 * Recursively reads a directory and returns an array of all files.
 *
 * @param directoryPath - The directory path to read.
 * @returns An array of file paths.
 *
 * @example
 * getDirectoryTree('/path/to/directory') // returns ['/path/to/directory/file1.txt', '/path/to/directory/subdirectory/file2.txt', ...]
 */
export declare function getDirectoryTree(directoryPath: string): string[];