import { Disposable } from "@anz-bank/vscode-sysl-model";
import { SpawnOptions } from "child_process";
/** Executes child processes and records completion. */
export declare class Executor {
    private readonly processes;
    private onSettledListeners;
    /**
     * Executes an asynchronous function and records its existence until it completes.
     */
    start(f: () => Promise<any>): Promise<any>;
    /**
     * Handles the completion of a process. If it was the final active process, invokes all onComplete
     * listeners.
     */
    private end;
    /**
     * Subscribes a callback to be invoked when all active processes have finished.
     *
     * If there are no active processes, the callback is invoked immediately.
     */
    onSettled(listener: () => any): Disposable;
    /** Returns a promise that resolves once all active processes have finished. */
    allSettled(): Promise<void>;
    /** Returns the number of active processes. */
    get count(): number;
    /** Returns a unique ID for a new process. */
    private id;
}
/** Spawns a child process and returns a promise that resolves to the buffer content of stdout. */
export declare function spawnBuffer(command: string, args?: ReadonlyArray<string>, options?: SpawnOptions & {
    input?: any;
}): Promise<Buffer>;