/**
 * Shared utilities for backend implementations.
 *
 * @module
 */
/**
 * Check whether a command is available on the system PATH.
 *
 * Splits `process.env.PATH` by the platform delimiter and checks each
 * directory for a file matching the command name. On Windows, also checks
 * each extension from `process.env.PATHEXT` (e.g., `.exe`, `.cmd`, `.bat`).
 *
 * Uses `fs.stat` (not `fs.access` with execute bit) for cross-platform
 * compatibility -- Windows does not have Unix execute permissions.
 *
 * @param command - The bare command name to look for (e.g., "claude")
 * @returns `true` if the command exists as a file in any PATH directory
 *
 * @example
 * ```typescript
 * if (await isCommandOnPath('claude')) {
 *   console.log('Claude CLI is available');
 * }
 * ```
 */
export declare function isCommandOnPath(command: string): Promise<boolean>;
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