import { InjectionToken } from '@angular/core';
import { Observable } from 'rxjs';
export interface GoogleChartsConfig {
    /**
     * This setting lets you specify a key that you may use with Geochart and Map Chart.
     * You may want to do this rather than using the default behavior which may result in
     * occasional throttling of service for your users.
     *
     * Only available when using Google Charts 45 or higher.
     *
     * {@link https://developers.google.com/chart/interactive/docs/basic_load_libs#load-settings Parameter documentation }
     * {@link https://developers.google.com/chart/interactive/docs/gallery/geochart GeoChart Documentation}
     */
    mapsApiKey?: string;
    /**
     * Which version of Google Charts to use.
     *
     * Please note that this library does only work with Google Charts 45 or higher.
     *
     * @description
     * Can be either a number specifying a
     * {@link https://developers.google.com/chart/interactive/docs/release_notes#current:-january-6,-2020 frozen version } of Google Charts
     * or one of the special versions `current` and `upcoming`.
     *
     * Defaults to `current`.
     *
     * {@link https://developers.google.com/chart/interactive/docs/basic_load_libs#basic-library-loading Offical Documentation}
     */
    version?: string;
    /**
     * When set to true, all charts and tooltips that generate HTML from user-supplied data will sanitize it
     * by stripping out unsafe elements and attributes.
     *
     * Only available when using GoogleCharts 47 or higher.
     *
     * {@link https://developers.google.com/chart/interactive/docs/basic_load_libs#load-settings Parameter documentation }
     */
    safeMode?: boolean;
}
export declare const GOOGLE_CHARTS_CONFIG: InjectionToken<Observable<GoogleChartsConfig>>;
export declare const GOOGLE_CHARTS_LAZY_CONFIG: InjectionToken<Observable<GoogleChartsConfig>>;