import { LitElement, PropertyDeclarations, TemplateResult } from 'lit-element';
import { StringMap, TOptions } from 'i18next';
import { FetchEvent } from '../NucleonElement/FetchEvent';
import { Gateways } from './types';
declare const I18n_base: typeof LitElement & import("lit-element").Constructor<import("../../../mixins/inferrable").InferrableMixinHost> & {
    inferredProperties: string[];
} & import("lit-element").Constructor<import("../../../mixins/translatable").TranslatableMixinHost> & {
    defaultNS: string;
};
/**
 * Custom element for effortless localization with i18next.
 *
 * @fires I18n#fetch - Instance of `I18n.FetchEvent`. Emitted before each translation request.
 *
 * @element foxy-i18n
 * @since 1.1.0
 */
export declare class I18n extends I18n_base {
    /** Instances of this event are dispatched on an element before each translation request. */
    static readonly FetchEvent: typeof FetchEvent;
    /** Shared [i18next](https://www.i18next.com) instance for all I18n elements. */
    static readonly i18next: import("i18next").i18n;
    /**
     * Registers a joint event listener for all i18next events that indicate
     * the availability of new translations. If you're using `I18n.i18next` to localize
     * your components, this function will call the provided handler every time an update is needed.
     *
     * @param handler Callback to invoke when translation changes.
     * @example const unsubscribe = I18n.onTranslationChange(triggerUpdate);
     */
    static onTranslationChange(handler: () => void): () => void;
    /**
     * Registers a global event listener that calls `handler` every time an i18next resource
     * is downloaded by `foxy-i18n`. Allows devs to specify resource location and/or fetch it
     * via a different channel (e.g. web sockets or using a localization SaaS).
     *
     * @param handler Callback to invoke on resource fetch.
     * @example const unsubscribe = I18n.onResourceFetch((ns, lang) => fetch(`path/to/${ns}/${lang}`));
     */
    static onResourceFetch(handler: (ns: string, lang: string) => Promise<Response>): () => void;
    /**
     * Adds payment gateway names to the i18next store. Fetch `fx:hosted_payment_gateways`
     * and `fx:payment_gateways` and call this method to make gateway names available to
     * elements like `foxy-payment-card`.
     *
     * @param param0 `fx:hosted_payment_gateways` or `fx:payment_gateways`
     * @example I18n.setGateways({ values: { authorize: { name: 'Authorize.Net' }}})
     * @deprecated
     */
    static setGateways({ values }: Gateways): void;
    /** @readonly */
    static get properties(): PropertyDeclarations;
    /**
     * Optional i18next translation function
     * [options](https://www.i18next.com/translation-function/essentials#overview-options).
     */
    options: TOptions<StringMap>;
    /**
     * Optional key to translate. Empty by default (renders nothing).
     * See [i18next docs](https://www.i18next.com/translation-function/essentials#accessing-keys) for more info.
     */
    key: string;
    private __unsubscribe?;
    /** @readonly */
    connectedCallback(): void;
    /** @readonly */
    render(): TemplateResult;
    /** @readonly */
    disconnectedCallback(): void;
}
export {};