export type BooleanFlagConfig = {
    type: "boolean";
    flag: string;
    enabled: boolean;
};
export type VariationFlagConfig = {
    type: "variation";
    flag: string;
    variations: {
        variation: string;
        weight: number;
    }[];
};
export type FlagConfig = BooleanFlagConfig | VariationFlagConfig;
export declare class FeatureFlags {
    private flagConfig;
    private readonly userId;
    constructor(flagConfig: FlagConfig[], userId: string);
    isEnabled(flag: string): boolean;
    variation(flag: string): string | undefined;
    allVariations(): {
        [k: string]: string | undefined;
    };
    updateFlagConfig(config: FlagConfig): void;
    resetFlagConfig(): void;
    private randomVariationForFlag;
    private findFlagConfig;
}