export declare function isSnapshotingAsJSON(): boolean;
export declare function incrementSnapshotAsJSON(): void;
export declare function decrementSnapshotAsJSON(): void;
export declare function isSnapshotingAsPlainObject(): boolean;
export declare function setIsApplyingSnapshotFromPlainObject(value: boolean): void;
export declare function setIsApplyingSnapshotFromJSON(value: boolean): void;
export declare function isApplyingSnapshotFromJSON(): boolean;
export declare function isApplyingSnapshotFromPlainObject(): boolean;
export declare function getSnapshotAsString(observable: object): string;
export declare function getSnapshot(observable: object, options?: {
    asJSON: boolean;
}): any;
export declare function applySnapshot(json: object | string, observable: object, options?: {
    asJSON: boolean;
}): void;