/// <reference types="node" />
export interface GluegunSystem {
    /**
     * Executes a command via execa.
     */
    exec(command: string, options?: any): Promise<any>;
    /**
     * Runs a command and returns stdout as a trimmed string.
     */
    run(command: string, options?: any): Promise<string>;
    /**
     * Spawns a command via crosspawn.
     */
    spawn(command: string, options?: any): Promise<any>;
    /**
     * Uses node-which to find out where the command lines.
     */
    which(command: string): string | void;
    /**
     * Returns a timer function that starts from this moment. Calling
     * this function will return the number of milliseconds from when
     * it was started.
     */
    startTimer(): GluegunTimer;
}
/**
 * Returns the number of milliseconds from when the timer started.
 */
export declare type GluegunTimer = () => number;
export declare type StringOrBuffer = string | Buffer;
export interface GluegunError extends Error {
    stdout?: StringOrBuffer;
    stderr?: StringOrBuffer;
}