/**
 * @module drain-ratio
 * @category Internal
 *
 * Adaptive lag-to-lead ratio for the dual-frontier drain strategy.
 *
 * The orchestrator splits its per-cycle stream budget between two frontiers:
 *
 * - **lagging** — newly subscribed or behind streams catching up.
 * - **leading** — actively-processing streams at the head of the log.
 *
 * After each cycle, this helper looks at how many events were actually
 * handled in each frontier and shifts the next cycle's split toward
 * whichever frontier had the higher per-stream throughput. The result is
 * clamped to `[0.2, 0.8]` so neither frontier can be starved.
 *
 * @internal
 */
import type { HandleResult } from "./drain-cycle.js";
/**
 * Compute the next lag-to-lead ratio from the cycle's handled events and
 * the frontier sizes used to claim them. Returns `RATIO_DEFAULT` when no
 * progress was made (nothing to base a decision on).
 */
export declare function compute_lag_lead_ratio(handled: ReadonlyArray<HandleResult>, lagging: number, leading: number): number;
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