import type { PlannedTestSuite } from '../types.js';
import type { TestChunk } from './test_pool_manager.js';
/**
 * Internal helper responsible for calculating concurrency and distributing
 * test files round-robin across Playwright browser page slots.
 */
export declare class ShardingStrategy {
    /**
     * Resolves numeric concurrency from setting or 'auto' CPU count.
     * Dynamically calculates default concurrency based on system resources (cpus / 2)
     * and scales worker pools across multiple configured browsers.
     *
     * @param value Setting value (number, 'auto', or undefined).
     * @param browserCount Number of target browsers (default: 1).
     * @returns Resolved positive concurrency integer.
     *
     * @example
     * ```ts
     * const concurrency = strategy.resolveConcurrency('auto', 3)
     * ```
     */
    resolveConcurrency(value: number | 'auto' | undefined, browserCount?: number): number;
    /**
     * Partitions tiered suites across concurrency slots for each specified browser.
     *
     * @param tieredSuites Array of suites belonging to the priority tier.
     * @param priority Priority tier number.
     * @param browserNames Array of target browser names (e.g. ['chromium']).
     * @param globalConcurrency Configured global concurrency setting.
     * @returns List of non-empty TestChunk objects.
     */
    shard(tieredSuites: PlannedTestSuite[], priority: number, browserNames: string[], globalConcurrency: number | 'auto' | undefined): TestChunk[];
}