/**
 * Security validation utilities.
 * Prevents path traversal, command injection, and unsafe path operations.
 */
/**
 * Validates a git ref for safe use in shell commands.
 * Rejects refs containing shell metacharacters or control characters.
 *
 * @param ref - Git ref (branch, tag, or commit SHA)
 * @returns The ref if valid
 * @throws If ref contains unsafe characters
 */
export declare function validateGitRef(ref: string): string;
/**
 * Validates a file path and resolves it safely.
 * Rejects paths that escape the base directory or exceed length limits.
 *
 * @param path - Path to validate
 * @param baseDir - Base directory (default: cwd)
 * @returns Resolved absolute path
 * @throws If path is invalid or escapes base
 */
export declare function validatePath(path: string, baseDir?: string): string;
/**
 * Validates that a path does not contain path traversal sequences
 * before resolution.
 */
export declare function sanitizePathComponent(component: string): string;
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