/// <reference types="google.visualization" />
import { EventEmitter } from '@angular/core';
import { Observable } from 'rxjs';
import { ChartErrorEvent, ChartReadyEvent, ChartSelectionChangedEvent } from '../../types/events';
export type Column = string | google.visualization.ColumnSpec;
export type Row = (string | number | Date | boolean | google.visualization.DataObjectCell | null)[];
export interface ChartBase {
    /**
     * The chart is ready for external method calls.
     *
     * Emits *after* the chart was drawn for the first time every time the chart gets redrawn.
     */
    ready: EventEmitter<ChartReadyEvent>;
    /**
     * Emits when an error occurs when attempting to render the chart.
     */
    error: EventEmitter<ChartErrorEvent>;
    /**
     * Emits when the user clicks a bar or legend.
     *
     * When a chart element is selected, the corresponding cell
     * in the data table is selected; when a legend is selected,
     * the corresponding column in the data table is selected.
     */
    select: EventEmitter<ChartSelectionChangedEvent>;
    /**
     * The drawn chart or `null`.
     */
    chart: google.visualization.ChartBase | null;
    /**
     * The underlying chart wrapper.
     *
     * This will throw an exception when trying to access the chart wrapper before `wrapperReady$` emits.
     */
    chartWrapper: google.visualization.ChartWrapper;
    /**
     * Emits after the `ChartWrapper` is created, but before the chart is drawn for the first time.
     */
    wrapperReady$: Observable<google.visualization.ChartWrapper>;
}