import type { ParallelRunnerMetrics, ParallelRunnerOptions, Task, TaskResult } from './types';
export declare class ParallelRunnerTimeoutError extends Error {
    readonly taskId: string;
    readonly timeoutMs: number;
    constructor(taskId: string, timeoutMs: number);
}
export declare class ParallelRunner {
    private readonly defaults;
    private metrics;
    constructor(defaults?: ParallelRunnerOptions);
    run<T>(tasks: Task<T>[], options?: ParallelRunnerOptions<T>): Promise<TaskResult<T>[]>;
    getMetrics(): ParallelRunnerMetrics;
    private mergeOptions;
    private mergeCallbacks;
}