/**
 * Generic process-spawning utilities with timeout handling,
 * stream cleanup, and discriminated result types.
 *
 * Extracted from openNextBuild.ts so other builders can reuse
 * the same timeout/stream/ENOENT patterns.
 */
import { spawn } from "child_process";
/**
 * Result from a spawned process with timeout handling.
 */
export type SpawnResult = {
    type: "success";
    code: number;
    stdout: string;
    stderr: string;
} | {
    type: "timeout";
    stdout: string;
    stderr: string;
} | {
    type: "aborted";
    stdout: string;
    stderr: string;
} | {
    type: "enoent";
    error: Error;
} | {
    type: "spawn_error";
    error: Error;
};
/**
 * Safely destroy process streams to prevent resource leaks.
 */
export declare function destroyProcessStreams(childProcess: ReturnType<typeof spawn>): void;
/**
 * Type guard for ENOENT errors (command not found).
 */
export declare function isEnoentError(err: unknown): err is NodeJS.ErrnoException;
/**
 * Spawn a child process with timeout handling and stream collection.
 *
 * `abortSignal` is the caller's cancellation signal (`DeployParams.abortSignal`
 * — Ctrl-C, or `fjall deployments cancel`). Without it a cancelled deploy still
 * waits out the full build timeout, because nothing else can reach the child.
 */
export declare function spawnWithTimeout(options: {
    command: string;
    args: string[];
    cwd: string;
    env: Record<string, string | undefined>;
    timeout: number;
    abortSignal?: AbortSignal;
    onStdoutData?: (data: string) => void;
    onStderrData?: (data: string) => void;
}): Promise<SpawnResult>;