import { TypedError } from 'typed-error';
export interface Credit {
    validFrom: Date;
    version: number;
    firstDiscountPriceCents: number;
    discountRate: number;
    discountThreshold: number;
    discountThresholdPriceCents: number;
}
interface Credits {
    [slug: string]: Credit[];
}
interface Options {
    credits?: Credits;
    target?: 'current' | 'latest' | number | Date;
}
interface CreditRange {
    from: number;
    to?: number;
}
export declare class InvalidParametersError extends TypedError {
    constructor(message: string);
}
export declare class CreditPricing {
    credits: {
        [slug: string]: Credit[];
    };
    private target;
    constructor(options?: Options);
    /**
     * Gets and returns pricing for a given feature.
     * @param featureSlug - feature slug
     * @returns credit pricing definition
     *
     * @example
     * getDefinition('device:microservices');
     */
    getDefinition(featureSlug: string): Credit | undefined;
    /**
     * Adjust a given credit amount to be just over the line to be higher than
     * the given lower unit cost. This is used to handle rounding edge cases in
     * which the original range calculations were slightly off.
     * @param featureSlug - credit feature slug
     * @param lowerUnitCost - lower unit cost to adjust to
     * @param amount - starting point credit amount
     * @returns number of credits needed to be just above the lower unit cost
     *
     * @example
     * fixRange('device:microservices', 198, 1000);
     */
    private fixRange;
    /**
     * Get credit amount range for a given unit cost.
     * @param featureSlug - feature slug
     * @param unitCost - unit cost
     * @param availableCredits - currently available credits
     * @returns credit amount range
     *
     * @example
     * getCreditRange('device:microservices', 190);
     * getCreditRange('device:microservices', 190, 1000);
     */
    getCreditRange(featureSlug: string, unitCost: number, availableCredits?: number): CreditRange;
    /**
     * Calculates the price of a credit purchase
     * @param featureSlug - feature slug
     * @param availableCredits - total of available and currently accrued credits
     * @param creditsToPurchase - number of credits to purchase
     * @returns price of credits for purchase
     *
     * @example
     * getCreditPrice('device:microservices', 0, 25000);
     */
    getCreditPrice(featureSlug: string, availableCredits: number, creditsToPurchase: number): number;
    /**
     * Calculate the total price of a credit purchase
     * @param featureSlug - feature slug
     * @param availableCredits - total of available and currently accrued credits
     * @param creditsToPurchase - number of credits to purchase
     * @returns total price of credits for purchase
     *
     * @example
     * getCreditTotalPrice('device:microservices', 0, 25000);
     */
    getCreditTotalPrice(featureSlug: string, availableCredits: number, creditsToPurchase: number): number;
    /**
     * Calculate discount percentage when compared to dynamic pricing
     * @param featureSlug - feature slug
     * @param availableCredits - total of available and currently accrued credits
     * @param creditsToPurchase - number of credits to purchase
     * @param dynamicPriceCents - dynamic price in cents
     * @returns discount percentage
     *
     * @example
     * getDiscountOverDynamic('device:microservices', 0, 25000);
     */
    getDiscountOverDynamic(featureSlug: string, availableCredits: number, creditsToPurchase: number, dynamicPriceCents: number): number;
    /**
     * Calculate the total savings of a credit purchase
     * @param featureSlug - feature slug
     * @param availableCredits - total of available and currently accrued credits
     * @param creditsToPurchase - number of credits to purchase
     * @param dynamicPriceCents - dynamic price in cents
     * @returns total savings of credits for purchase
     *
     * @example
     * getTotalSavings('device:microservices', 0, 25000, 100);
     */
    getTotalSavings(featureSlug: string, availableCredits: number, creditsToPurchase: number, dynamicPriceCents: number): number;
}
export {};