/**
 * A map for provider information
 *
 * @interface Providers
 */
export interface Providers {
    [name: string]: Provider;
}
/**
 * Provider error entry
 *
 * @export
 * @interface ProviderErrors
 */
export interface ProviderErrors {
    [code: string]: string;
}
/**
 * Object that describes a user-defined provider.
 *
 * @export
 * @interface UserDefinedProvider
 */
export interface UserDefinedProvider {
    name: string;
    provider: Provider;
}
/**
 * Single provider interface.
 * Used to store pre-constructed query templates for various currency rate providers.
 * @export
 * @interface Provider
 */
export interface Provider {
    /**
     * An API key / Profile ID / Access key for a provider.
     *
     * @type {*}
     * @memberof Provider
     */
    key: any;
    /**
     * Endpoint configuration object for a provider:
     * The base template is the root of the access URL, with a place for access key in the form of %KEY% (if needed)
     * The single template is used for single currency conversions, requires a %FROM% and a %TO% to be present.
     * The multiple template is currently unused.
     * @type {{ base: string; single: string; multiple: string }}
     * @memberof Provider
     */
    endpoint: {
        base: string;
        single: string;
        multiple: string;
    };
    /**
     * A function that returns a map of currencies from the data object returned by axios (response.data)
     *
     * @example
     *  function(data) { //must return {currency1:rate1,curency2:rate2} in reference to the base currency.
     *    return data.rates;
     *  }
     *
     * @type {Function}
     * @memberof Provider
     */
    handler: Function;
    /**
     * A map of possible errors and their respective messages
     *
     * @type {*}
     * @memberof Provider
     */
    errors: ProviderErrors;
    /**
     * A unique method to resolve errors, if any.
     * Some APIs return their errors via success responses, others via HTTP failures.
     * These two modes are mutually exclusive; The data passed to the errorHandler is:
     * the response.data object, in the case of 'success' failures
     * the response object, in the case of Axios errors (HTTP failures)
     *
     * @type {Function}
     * @memberof Provider
     */
    errorHandler: (data: any) => number | string | null;
}
/**
 * An interface for an object that is used to configure providers
 *
 * @export
 * @interface ProviderReference
 */
export interface ProviderReference {
    name: string;
    key: any;
}
/**
 * A function that constructs provider based on raw input data.
 *
 * @export
 * @param {ProviderReference} provider object containing provider name and api key
 * @returns {Provider} constructed provider
 */
export declare function resolveProvider(provider: ProviderReference): Provider;
/**
 * Provider map initialization
 */
export declare const providers: Providers;