/** The local-restore boundary of one opted-in persisted Collection. */
export type PersistedReadinessSnapshot = {
    status: `loading`;
    error?: never;
} | {
    status: `ready`;
    error?: never;
} | {
    status: `error`;
    error: unknown;
};
/** @internal Capability supplied by a persistence adapter, not by core sync. */
export interface PersistedReadinessSource {
    /** Time to prefer network before a completed persisted restore may render. */
    networkTimeoutMs: number;
    /** Anchor the deadline to this Collection's current sync run. */
    getOrStartNetworkDeadline: () => number;
    getSnapshot: () => PersistedReadinessSnapshot;
    subscribe: (listener: () => void) => () => void;
}
/** @internal Config capability shared with first-party persistence adapters. */
export declare const PERSISTED_READINESS: unique symbol;
export declare function getPersistedReadinessSource(config: object): PersistedReadinessSource | undefined;