import { Timeline } from '../timeline/timeline';
import { Sequenced } from './sequenced-timeline';
import { AbstractCompositeTimeline } from '../timeline/abstract-composite-timeline';
import { TimelineEvents } from '../timeline';
export interface SequenceEvents<T extends Timeline> extends TimelineEvents<Sequence<T>> {
    completed: [event: {}, source: Sequence<T>];
    sought: [event: {
        from: number;
    }, source: Sequence<T>];
    timelineActivated: [timeline: T, source: Sequence<T>];
    timelineDeactivated: [timeline: T, source: Sequence<T>];
    updated: [event: {
        dt: number;
    }, source: Sequence<T>];
}
export declare class Sequence<T extends Timeline> extends AbstractCompositeTimeline<T> implements Timeline {
    private readonly eventEmitter;
    readonly on: <K extends keyof SequenceEvents<T>>(eventName: K, handler: (...args: import("@akolos/event-emitter/build/union-to-intersection").UnionToIntersection<SequenceEvents<T>[K]>) => void) => this;
    readonly off: <K extends keyof SequenceEvents<T>>(eventName: K, handler: (...args: import("@akolos/event-emitter/build/union-to-intersection").UnionToIntersection<SequenceEvents<T>[K]>) => void) => this;
    protected readonly emit: <K extends keyof SequenceEvents<T>>(eventName: K, ...args: import("@akolos/event-emitter/build/union-to-intersection").UnionToIntersection<SequenceEvents<T>[K]>) => this;
    private readonly _items;
    private readonly _activeTimelines;
    /**
     * The set of all timelines that were updated during this sequence's most recent update.
     */
    getActiveTimelines(): ReadonlySet<T>;
    /**
     * All timelines included in this sequence along with their start times.
     */
    getItems(): ReadonlyArray<Sequenced<T>>;
    /**
     * Creates a new sequence.
     * @param sequenceItems The timelines to include in this sequence, with each having a start time.
     */
    constructor(sequenceItems: Sequenced<T>[]);
    _update(dt: number): void;
    protected _completed(): void;
    protected _start(): void;
    protected _stop(): void;
    protected _seek(from: number): void;
    private updateTimelines;
}