import { FeatureFlagValue, IOption, IUser, VariationDataType } from "./types";
export declare function generateorGetGuid(): string;
export declare function serializeUser(user: IUser | undefined): string;
export declare function isNumeric(str: string): boolean;
export declare function parseVariation(type: VariationDataType, value: string): FeatureFlagValue;
export declare function uuid(): string;
export declare function validateUser(user: IUser): string | null;
export declare function isNullOrUndefinedOrWhiteSpace(value?: string): boolean;
export declare function validateOption(option: IOption): string | null;
export declare function generateConnectionToken(text: string): string;
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