/**
 * Shell execution wrapper with timeout, retry, and structured output.
 */
export interface ExecResult {
    stdout: string;
    stderr: string;
    exitCode: number;
}
export interface ExecOptions {
    cwd?: string;
    timeout?: number;
    /** Retry count on failure (default 0) */
    retries?: number;
    /** Env vars merged with process.env */
    env?: Record<string, string>;
}
/**
 * Run a shell command and return structured result.
 * Throws on non-zero exit unless `reject: false` is used internally.
 */
export declare function exec(command: string, args?: string[], opts?: ExecOptions): Promise<ExecResult>;
/**
 * Run and return stdout trimmed, or null on failure.
 */
export declare function execSafe(command: string, args?: string[], opts?: ExecOptions): Promise<string | null>;
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