import { DateAdapter } from '../date-adapter';
import { IOccurrenceGenerator } from '../interfaces';
import { Operator, OperatorFnOutput } from './interface';
declare const ADD_OPERATOR_ID: unique symbol;
/**
 * An operator function which accepts a spread of occurrence generators
 * and adds their occurrences to the output.
 *
 * @param streams a spread of occurrence generators
 */
export declare function add<T extends typeof DateAdapter>(...streams: IOccurrenceGenerator<T>[]): OperatorFnOutput<T>;
export declare class AddOperator<T extends typeof DateAdapter> extends Operator<T> {
    static isAddOperator(object: unknown): object is AddOperator<any>;
    protected readonly [ADD_OPERATOR_ID] = true;
    /** Not actually used but necessary for IRunnable interface */
    set(_: 'timezone', value: string | null): AddOperator<T>;
    protected calculateIsInfinite(): boolean;
    protected calculateHasDuration(): boolean;
}
export {};
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