import { exec as _exec, SpawnOptionsWithoutStdio } from 'child_process';
export declare const exec: typeof _exec.__promisify__;
export declare class SpawnError extends Error {
    stdout: string;
    stderr: string;
    processError?: any;
    code?: number;
    constructor(stdout: string, stderr: string);
}
/**
 * Won't throw error, the error handling should be done in callback and if-throw style.
 * Use spawnAndWait if you want error handling in try-catch style.
 */
export declare function spawn(options: {
    cmd: string;
    args?: string[];
    options?: SpawnOptionsWithoutStdio;
    on_stdout?: (chunk: any) => void;
    on_stderr?: (chunk: any) => void;
    on_error?: (error: any) => void;
}): Promise<number | null>;
/**
 * spawn a child process and return the stdout and stderr in promise
 *
 * the console is not used to output the stdout and stderr
 *
 * the error stack is preserved (avoided lost in native event loop)
 */
export declare function spawnAndWait(options: {
    cmd: string;
    args: string[];
    options?: SpawnOptionsWithoutStdio;
}): Promise<{
    code: number | null;
    stdout: string;
    stderr: string;
}>;