import { DateAdapter } from '../date-adapter';
import { OccurrenceGenerator } from '../interfaces';
import { Operator, OperatorFnOutput } from './interface';
declare const OCCURRENCE_STREAM_ID: unique symbol;
/**
 * `OccurrenceStream` allows you to combine occurrence generators using
 * operator functions to produce new, complex recurrence schedules.
 * For example: internally, `Schedule` relies on an `OccurrenceStream` to combine
 * rrules, exrules, rdates, and exdates appropriately.
 *
 * ### Example
 ```
 const schedule1 = new Schedule();
 const schedule2 = new Rule();
 const dates = new Dates();

 const stream = new OccurrenceStream({
   operators: [
     add(schedule1),
     subtract(schedule2, dates)
   ]
 })

 stream.occurrences().toArray() // occurrences

 new Calendar({ schedules: stream }).occurrences().toArray() // occurrences
 ```
 * In general, you should not need to manually create an `OccurrenceStream`.
 * Instead, you can use `OccurrenceGenerater#pipe()` to pass an occurrence
 * generator's occurrences through various operator functions (similar to
 * rxjs pipes).
 *
 * ### Example
 ```
 const schedule = new Schedule().pipe(
  add(schedule1),
  subtract(schedule2, dates)
 )

 schedule.occurrences().toArray() // occurrences
 ```
 *
 * Operator functions:
 * - add()
 * - subtract()
 * - intersection()
 * - unique()
 */
export declare class OccurrenceStream<T extends typeof DateAdapter> extends OccurrenceGenerator<T> {
    /**
     * Similar to `Array.isArray()`, `isOccurrenceStream()` provides a surefire method
     * of determining if an object is an `OccurrenceStream` by checking against the
     * global symbol registry.
     */
    static isOccurrenceStream(object: unknown): object is OccurrenceStream<any>;
    pipe: (...operatorFns: OperatorFnOutput<T>[]) => OccurrenceStream<T>;
    readonly isInfinite: boolean;
    readonly hasDuration: boolean;
    readonly timezone: string | null;
    readonly operators: ReadonlyArray<Operator<T>>;
    protected readonly [OCCURRENCE_STREAM_ID] = true;
    private readonly lastOperator;
    constructor(args: {
        operators: OperatorFnOutput<T>[] | Operator<T>[];
        dateAdapter?: T;
        timezone?: string | null;
    });
    set(prop: 'timezone', value: string | null, options?: {
        keepLocalTime?: boolean;
    }): OccurrenceStream<T>;
    private emptyIterator;
}
export declare function pipeFn<T extends typeof DateAdapter>(self: OccurrenceGenerator<T>): (...operatorFns: OperatorFnOutput<T>[]) => OccurrenceStream<T>;
export {};
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