/**
 * Checks if a file exists at the specified path
 * Safely handles path resolution and filesystem access errors
 *
 * @param {string} dir - The base directory path
 * @param {string} currentPath - The relative file path to check
 * @returns {boolean} True if the file exists, false otherwise
 *
 * @example
 * fileExists('/project', 'src/index.js') // true if /project/src/index.js exists
 * fileExists('.', 'package.json') // true if ./package.json exists
 */
export function fileExists(dir: string, currentPath: string): boolean;