import { Worker } from 'worker_threads';

type Task<TaskArguments> = {
    fn: (data: TaskArguments) => any | ((data: TaskArguments) => Promise<any>);
    args?: TaskArguments;
    onSuccess?: (msg: any) => any;
    onError?: (err: Error) => any;
};
/**
 * Runs the given tasks in parallel threads, allowing for CPU-intensive operations
 * to be offloaded from the main thread. Each task is given its own worker, and
 * the tasks are run in the order they are given in the array. The function
 * returns an array of Worker objects, which can be used to terminate the
 * workers if needed.
 *
 * @param tasks An array of tasks to run in parallel. Each task is an object with
 *   three properties: `fn` (a function that takes no arguments), `args` (an
 *   optional object that is passed to the worker as `workerData`), and
 *   `onSuccess` and `onError` (optional functions that are called with the
 *   result of the task if it succeeds or fails, respectively).
 *
 * @returns An array of Worker objects, which can be used to terminate the
 *   workers if needed.
 */
declare function threadTasks<TaskArguments>(tasks: Task<TaskArguments>[]): Promise<Worker>[];
/**
 * Executes a set of tasks in parallel threads, with controlled concurrency (max thread count).
 *
 * @param tasks - An array of tasks to run in parallel. Each task is an object
 *   with the following properties: `fn` (a function to be executed), `args`
 *   (optional arguments for the function), and optional `onSuccess` and
 *   `onError` callbacks.
 * @param getMaxThreads - An optional function that returns the maximum
 *   number of simultaneously running tasks allowed. If not provided, it defaults to
 *   the number of CPU cores available.
 * @param afterAll - An optional callback function that is executed after all
 *   tasks have been completed.
 *
 * @returns A promise that resolves once all tasks have been processed.
 */
declare function threadTasksAdvanced<TaskArguments>({ tasks, getMaxThreads, afterAll }: {
    tasks: Task<TaskArguments>[];
    getMaxThreads?: () => number;
    afterAll?: () => any | (() => Promise<any>);
}): Promise<unknown>;

export { type Task, threadTasks, threadTasksAdvanced };