import { OnChanges, OnDestroy, SimpleChanges } from '@angular/core';
import { Observable, Subject } from 'rxjs';
import { Governor } from '../extension/governor';
export declare class ButtonGroup implements OnChanges, OnDestroy {
    antBtnGroup: 'large' | 'small' | '' | null;
    size: 'large' | 'small' | null;
    onChanges$: Subject<SimpleChanges>;
    onDestroy$: Subject<void>;
    input$: Observable<{
        antBtnGroup: string;
        size: string;
    }>;
    constructor(prefix: string, governor: Governor);
    ngOnChanges(changes: SimpleChanges): void;
    ngOnDestroy(): void;
}