/**
 * Graph-native stream gap recovery (#133 interim slice).
 *
 * The discrete/continuous law is the replay discriminator: only discrete
 * crossings are replayable graph events; continuous transients must NOT replay.
 * Recovery paths type-refuse continuous cells — widening the SSE replay payload
 * with signals is intentionally uncompilable.
 *
 * @module
 */
import type { StateCell, StateCellKind } from './state-cell.js';
import type { SignalSource } from './signal.js';
/** Only discrete/replayable cells may enter graph-native recovery paths (#133). */
export type ReplayableRecoveryCell = StateCell & {
    readonly replayable: true;
    readonly kind: 'discrete';
};
/** Narrow a {@link StateCell} to a replayable recovery entry, or `undefined`. */
export declare const asReplayableRecoveryCell: (cell: StateCell) => ReplayableRecoveryCell | undefined;
/**
 * Classify a canonical {@link SignalSource} by the discrete/continuous replay law
 * (ADR-0035 / ROADMAP Epic 9).
 */
export declare function signalSourceKind(source: SignalSource): StateCellKind;
/**
 * Classify an SSE signal frame payload (often ad-hoc, not a full {@link SignalSource}).
 */
export declare function signalPayloadKind(payload: unknown): StateCellKind;
/** Whether a replay patch entry is morphable HTML (not a signal frame). */
export declare function isReplayHtmlPatch(patch: unknown): boolean;
/** True when the replay array carries signal frames that need snapshot supplement. */
export declare const replayDroppedSignals: (patches: readonly unknown[]) => boolean;
/** Extract replayable discrete signal payloads from a snapshot `signals` field. */
export declare function filterDiscreteSnapshotSignals(signals: unknown): readonly unknown[];
/**
 * Validate the snapshot `signals` field before graph-native recovery applies HTML.
 * Returns an error message when the field is missing or not an object/array.
 */
export declare function validateSnapshotSignalsField(signals: unknown): string | null;
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