import { CommonPlotProps, CommonPlotState } from './common.contracts';
/**
 * Wrapper for UUID/v4
 */
export declare const GetGuid: () => string;
/**
 * For comparing a new hash against an old one.
 * Return whether the hashes have changed, as well as the contents of the new hash
 */
export interface HashAndCompareResult {
    /**
     * New hash string
     */
    newHash: string;
    /**
     * Whether the new hash has changed from the previous one
     */
    hasChanged: boolean;
}
/**
 * Get a SHA1 hash of an item
 * @param input Input item to hash
 * @returns hash of item as string
 */
export declare const GetHash: <T>(input: T) => string;
/**
 * Get a SHA1 hash of an item, and compare it to the previous value.
 * Returns whether the new hash has changed from previous + the contents of the new hash
 *
 * @typeparam T The type to hash
 * @param input Input item used to generate new hash + compare to previous
 * @param prevHash Previous hash string
 */
export declare const GetAndCompareHash: <T>(input: T, prevHash?: string) => HashAndCompareResult;
/**
 * If the input data has changed (according to a hash), increment the plot revision and store new hash
 */
export declare const HandleDerivedStateUpdate: <TProps extends CommonPlotProps, TState extends CommonPlotState>(propsIn: TProps, stateIn: TState) => {
    dataset: import("./common.contracts").AppPlotData[];
    revision: number;
    dataHash: string;
};