import * as i0 from "@angular/core";
export declare class ChartService {
    constructor();
    calculateMonths(date1: Date, date2: Date): number;
    generateDonutChartData(startDate: string, endDate: string): {
        donutData: {
            datasets: {
                data: number[];
                backgroundColor: string[];
            }[];
        };
        donutOptions: {
            plugins: {
                legend: {
                    position: string;
                };
                customTextAndLine: {
                    remainingColor: string;
                };
            };
            cutout: string;
            responsive: boolean;
            layout: {
                padding: {
                    top: number;
                };
            };
            events: never[];
        };
        remainingColor: string;
        remainingMonths: number;
    };
    getCustomPlugin(): {
        id: string;
        afterDraw(chart: any, args: any, pluginOptions: any): void;
    };
    static ɵfac: i0.ɵɵFactoryDeclaration<ChartService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<ChartService>;
}