/** Promise Pool */
export default class PromisePool<EveryItemResult extends any> {
    /** How many tasks to run at once. */
    concurrency: number;
    /** How many tasks are currently running. */
    running: number;
    /** How many tasks have been started. */
    started: number;
    /** For upcoming tasks, they have a function (a promise resolver) inserted into the queue which starts the task when called. */
    protected readonly queue: Array<Function>;
    /** Instantiate the PromisePool with the desired concurrency. */
    constructor(concurrency?: number);
    /** Add a task to the pool. */
    open<AnyItemResult extends EveryItemResult>(task: () => Promise<AnyItemResult> | AnyItemResult): Promise<AnyItemResult>;
}
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