import { DateTime, IDateAdapter } from '../date-time';
export declare class InvalidDateAdapterError extends Error {
}
declare const DATE_ADAPTER_ID: unique symbol;
export declare class DateAdapter implements IDateAdapter<unknown> {
    static readonly date: unknown;
    static readonly hasTimezoneSupport: boolean;
    /**
     * Similar to `Array.isArray()`, `isInstance()` provides a surefire method
     * of determining if an object is a `DateAdapter` by checking against the
     * global symbol registry.
     */
    static isInstance(object: unknown): object is DateAdapter;
    static isDate(_object: unknown): boolean;
    static fromJSON(_json: IDateAdapter.JSON): DateAdapter;
    static fromDateTime(_datetime: DateTime): DateAdapter;
    readonly date: unknown;
    readonly timezone: string | null;
    /** A length of time in milliseconds */
    readonly duration: number | undefined;
    /**
     * An array of OccurrenceGenerator objects which produced this DateAdapter.
     *
     * #### Details
     *
     * When a Rule object creates a DateAdapter, that Rule object adds itself to
     * the DateAdapter's generators property before yielding the DateAdapter. If you are using a Rule
     * object directly, the process ends there and the DateAdapter is yielded to you (in this case,
     * generators will have the type `[Rule]`)
     *
     * If you are using another object, like a Schedule however, then each DateAdapter is generated
     * by either a Dates (rdates) or Rule (rrule) within the Schedule. After being originally
     * generated by a Dates/Rule, the DateAdapter is then filtered by any exdate/exrules and,
     * assuming it passes, then the DateAdapter "bubbles up" to the Schedule object itself. At this
     * point the Schedule adds itself to the generators array of the DateAdapter and yields the date
     * to you. So each DateAdapter produced by a Schedule has a generators property of type
     * `[Schedule, Rule | Dates]`.
     *
     * The generators property pairs well with the `data` property on many OccurrenceGenerators. You
     * can access the OccurrenceGenerators which produced a DateAdapter via `generators`, and then
     * access any arbitrary data via the `data` property.
     *
     * _Note: occurrence operators are never included in the generators array._
     *
     */
    readonly generators: unknown[];
    protected readonly [DATE_ADAPTER_ID] = true;
    constructor(_date: unknown, _options?: unknown);
    /**
     * Returns `undefined` if `this.duration` is falsey. Else returns
     * the `end` date.
     */
    readonly end: unknown | undefined;
    set(_prop: 'timezone', _value: string | null): DateAdapter;
    valueOf(): number;
    toISOString(): string;
    toDateTime(): DateTime;
    toJSON(): IDateAdapter.JSON;
    assertIsValid(): boolean;
}
export {};
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