/**
 * Pure derived-deadline arithmetic for `control.timeoutSec`.
 *
 * "Active execution only" is the scope every node-timeout ruling shares: the
 * clock runs from `startedAt` but stops counting while the node was parked
 * for a human decision. Rather than persist a separate "paused" duration,
 * this module recomputes the deadline on demand from `startedAt` plus the
 * already-durable `approvalHistory` / `inputHistory` — so it is correct
 * immediately after `hydrate()` or a reconnect with no extra wiring, and a
 * live timer is never the source of truth.
 *
 * @docLink packages/flow-engine/concepts#node-deadline
 */
import type { NodeExecution } from "@skaile/workspaces/types";
/**
 * Milliseconds remaining before `execution`'s active-execution deadline, given
 * `timeoutSec`. Negative once the deadline has passed. `undefined` when no
 * timeout applies — `timeoutSec` is unset, or the node has no `startedAt` to
 * measure from (e.g. it hasn't actually started).
 *
 * Active time is wall-clock since `startedAt` minus every *resolved*
 * approval/input interval recorded at or after that `startedAt` (an
 * interval opened before a retry's fresh `startedAt` never counts against
 * the new attempt; a still-open interval never counts because the node
 * would not be `running` while parked).
 *
 * @param execution - Current node snapshot. Only `startedAt`, `approvalHistory`,
 *   and `inputHistory` are read.
 * @param timeoutSec - Authored `control.timeoutSec`, or `undefined` for no timeout.
 * @param nowMs - Caller-supplied wall clock (`Date.now()` in production, injectable
 *   for tests).
 * @docLink packages/flow-engine/concepts#remaining-active-execution-ms
 */
export declare function remainingActiveExecutionMs(execution: NodeExecution, timeoutSec: number | undefined, nowMs: number): number | undefined;
/**
 * Whether `execution` has exceeded its derived active-execution deadline.
 * `false` when no timeout applies. Convenience wrapper over
 * {@link remainingActiveExecutionMs} for call sites that only need the
 * boolean.
 *
 * @docLink packages/flow-engine/concepts#is-active-execution-expired
 */
export declare function isActiveExecutionExpired(execution: NodeExecution, timeoutSec: number | undefined, nowMs: number): boolean;
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