import { IBaseGroupFieldInfo, IBaseGroupFieldJSON, IPivotTableGroupInfo, PivotDataFieldTypeEnum } from '../types';
import { DataField } from './data-field';
export declare abstract class BaseGroupField extends DataField {
    protected originalFieldId: string;
    /**
     * Get the current group type
     * @returns {PivotDataFieldTypeEnum} - The group type
     */
    abstract getDataFieldType(): PivotDataFieldTypeEnum;
    abstract getGroupInfo(): IPivotTableGroupInfo;
    abstract getOriginFieldId(): string;
    abstract refreshGroupField(originalField: DataField): void;
    getFieldInfo(): IBaseGroupFieldInfo;
    toJSON(): IBaseGroupFieldJSON;
    /**
     * This is a `static` method that returns different grouping instances based on the passed json
     * Then call the `fromJSON` method of the instance to initialize it
     * @param {IBaseGroupFieldInfo} json
     * @returns {BaseGroupField | undefined} - The instance of the group field
     */
    static fromJSON(json: IBaseGroupFieldJSON): BaseGroupField | undefined;
}