import EventEmitter from "wolfy87-eventemitter";
/**
 * Example usage
 * ```
 * const queue = new TaskQueue();
 * queue.on("exec", execCommand);
 * function execCommand(command, promiseHolder) {
 *   let promise;
 *   try{
 *     switch(command.method){
 *       case "foo": foo(command.data);
 *     }
 *   } catch (err) {
 *     promise = Promise.reject(error);
 *   }
 *   promiseHolder.promise = promise;
 * }
 * function foo(data) {
 *  console.log(data); // { somedata: "123" }
 *  return Promise.resolve();
 * }
 * queue.push("foo", { somedata: "123" });
 * ```
 */
export interface Command {
    method: string;
    resolve: (value?: any | PromiseLike<any>) => void;
    reject: (reason?: any) => void;
    data?: any;
}
export interface PromiseHolder {
    promise: Promise<any> | null;
}
export declare class TaskQueue extends EventEmitter {
    _closed: Boolean;
    _busy: Boolean;
    _queue: Command[];
    private name;
    /**
     * 是否显示 log
     */
    private isDebug;
    constructor(name?: string, debug?: boolean);
    close(): void;
    push(method: string, data?: any): Promise<any>;
    _handlePendingCommands(): void;
    _handleCommand(command: Command): Promise<any>;
}