import { Configuration } from '../configuration/PricingContext';
import { Feature } from '../../types';
import { PaymentType } from '../../main/models/pricing2yaml/feature';
export interface FeatureStatus {
    eval: Boolean | string;
    used: string | number | boolean | null;
    limit: string | number | boolean | null;
}
export interface ExtendedFeatureStatus extends FeatureStatus {
    error: {
        code: string;
        message: string;
    } | null;
}
export type ContextToEval = Record<'features' | 'usageLimits', Record<string, string | boolean | number | PaymentType[]>>;
export declare function generateUserPricingToken(): string;
/**
 * Modifies the given JWT by changing the evaluation of the specified feature
 * using a {@link string} expression that will be evaluated on the client side
 * of the application.
 *
 * @param token      The generated JWT returned by the
 *                   {@link generateUserPricingToken()} method.
 * @param featureId  The ID of a feature defined within the token body.
 * @param expression The expression for the feature that will replace its
 *                   current evaluation.
 * @returns A modified version of the provided JWT containing the new expression
 *          in the "eval" attribute of the specified feature.
 */
export declare function addExpressionToToken(token: string, featureId: string, expression: string): string;
export declare function extractContextToEvalFromSubscriptionContext(subscriptionContext: Configuration): ContextToEval;
export declare function evaluateFeature(feature: Feature | string, configuration?: Configuration | undefined, subscriptionContext?: Record<string, any> | undefined, pricingContext?: ContextToEval | undefined): ExtendedFeatureStatus;