/**
 * @module backoff
 * @category Internal
 *
 * Per-reaction retry backoff delay computation. Pure function — keeps
 * `DrainController` and `reactions._finalize` testable in isolation.
 *
 * @internal
 */
import type { BackoffOptions } from "../types/action.js";
/**
 * Compute the wall-clock delay (in ms) to wait before the next attempt on
 * a stream whose handler just failed.
 *
 * @param retry - The lease's `retry` counter at finalize time. `0` is the
 *   first attempt that failed; `1` is after one retry; etc.
 * @param opts - Per-reaction backoff config. Returns `0` when undefined.
 * @returns Non-negative integer milliseconds. Always `0` when `opts` is
 *   undefined or `baseMs <= 0`.
 */
export declare function compute_backoff_delay(retry: number, opts: BackoffOptions | undefined): number;
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