declare namespace gsap {
    type Timeline = SimpleTimeline | TimelineLite | TimelineMax;

    class SimpleTimeline extends Animation {
        /**
         * SimpleTimeline is the base class for TimelineLite and TimelineMax, providing the most basic timeline () => voidality and it is used for the root timelines in TweenLite but is only
         * intended for internal use in the GreenSock tweening platform. It is meant to be very fast and lightweight.
         */
        constructor(vars?: any);

        /** If true, child tweens/timelines will be removed as soon as they complete. */
        autoRemoveChildren: boolean;

        /** Controls whether or not child tweens/timelines are repositioned automatically (changing their startTime) in order to maintain smooth playback when properties are changed on-the-fly. */
        smoothChildTiming: boolean;

        /** Adds a TweenLite, TweenMax, TimelineLite, or TimelineMax instance to the timeline at a specific time. */
        add(child: any, position?: any, align?: string, stagger?: number): SimpleTimeline;

        /** renders */
        render(time: number, suppressEvents?: boolean, force?: boolean): SimpleTimeline;
    }

    class TimelineLite extends SimpleTimeline {
        constructor(vars?: {});

        /** Adds a tween, timeline, callback, or label (or an array of them) to the timeline. */
        add(value: any, position?: any, align?: string, stagger?: number): TimelineLite;

        /** Adds a label to the timeline, making it easy to mark important positions/times. */
        addLabel(label: string, position: any): TimelineLite;

        /** Inserts a special callback that pauses playback of the timeline at a particular time or label. */
        addPause(position?: any, callback?: (...args: any[]) => void, params?: any[], scope?: any): TimelineLite;

        /**
         * Adds a callback to the end of the timeline (or elsewhere using the "position" parameter) - this is a convenience method that accomplishes exactly the same thing as
         * add( TweenLite.delayedCall(...) ) but with less code.
         */
        call(callback: (...args: any[]) => void, params?: any[], scope?: any, position?: any): TimelineLite;

        /** Empties the timeline of all tweens, timelines, and callbacks (and optionally labels too). */
        clear(labels?: boolean): TimelineLite;

        /** Returns the time at which the animation will finish according to the parent timeline's local time. */
        endTime(includeRepeats?: boolean): number;

        /**
         * Seamlessly transfers all tweens, timelines, and [optionally] delayed calls from the root timeline into a new TimelineLite so that you can perform advanced tasks on a seemingly global
         * basis without affecting tweens/timelines that you create after the export.
         */
        static exportRoot(vars?: {}, omitDelayedCalls?: boolean): TimelineLite;

        /**
         * Adds a TweenLite.from() tween to the end of the timeline (or elsewhere using the "position" parameter) - this is a convenience method that accomplishes exactly the same thing as
         * add( TweenLite.from(...) ) but with less code.
         */
        from(target: {}, duration: number, vars: {}, position?: any): TimelineLite;

        /** Adds a TweenLite.fromTo() tween to the end of the timeline - this is a convenience method that accomplishes exactly the same thing as add( TweenLite.fromTo(...) ) but with less code. */
        fromTo(target: {}, duration: number, fromVars: {}, toVars: {}, position?: any): TimelineLite;

        /** Returns an array containing all the tweens and/or timelines nested in this timeline. */
        getChildren(nested?: boolean, tweens?: boolean, timelines?: boolean, ignoreBeforeTime?: number): Array<Tween | Timeline>;

        /** Returns the time associated with a particular label. */
        getLabelTime(label: string): number;

        /** Returns the tweens of a particular object that are inside this timeline. */
        getTweensOf(target: {}, nested?: boolean): Tween[];

        /**
         * Clears any initialization data (like starting/ending values in tweens) which can be useful if, for example, you want to restart a tween without reverting to any previously recorded
         * starting values.
         */
        invalidate(): TimelineLite;

        /** Returns the most recently added child tween/timeline/callback regardless of its position in the timeline. */
        recent(): Animation;

        /** Removes a tween, timeline, callback, or label (or array of them) from the timeline. */
        remove(value: any): TimelineLite;

        /** Removes a label from the timeline and returns the time of that label. */
        removeLabel(label: string): any;

        /** Jumps to a specific time (or label) without affecting whether or not the instance is paused or reversed. */
        seek(position: string | number, supressEvents?: boolean): TimelineLite;

        /**
         * Adds a zero-duration tween to the end of the timeline (or elsewhere using the "position" parameter) that sets values immediately (when the virtual playhead reaches that
         * position on the timeline) - this is a convenience method that accomplishes exactly the same thing as add( TweenLite.to(target, 0, {...}) ) but with less code.
         */
        set(target: {}, vars: {}, position?: any): TimelineLite;

        /** Shifts the startTime of the timeline's children by a certain amount and optionally adjusts labels too. */
        shiftChildren(amount: number, adjustLabels?: boolean, ignoreBeforeTime?: number): TimelineLite;

        /**
         * Tweens an array of targets from a common set of destination values (using the current values as the destination), but staggers their start times by a specified amount of time,
         * creating an evenly-spaced sequence with a surprisingly small amount of code.
         */
        staggerFrom(
            targets: any,
            duration: number,
            vars: {},
            stagger?: number,
            position?: any,
            onCompleteAll?: (...args: any[]) => void,
            onCompleteAllParams?: any[],
            onCompleteScope?: any
        ): TimelineLite;

        /**
         * Tweens an array of targets from and to a common set of values, but staggers their start times by a specified amount of time, creating an evenly-spaced sequence with a surprisingly
         * small amount of code.
         */
        staggerFromTo(
            targets: any,
            duration: number,
            fromVars: {},
            toVars: {},
            stagger?: number,
            position?: any,
            onCompleteAll?: (...args: any[]) => void,
            onCompleteAllParams?: any[],
            onCompleteAllScope?: any
        ): TimelineLite;

        /**
         * Tweens an array of targets to a common set of destination values, but staggers their start times by a specified amount of time, creating an evenly-spaced sequence with a surprisingly
         * small amount of code.
         */
        staggerTo(
            targets: any,
            duration: number,
            vars: {},
            stagger: number,
            position?: any,
            onCompleteAll?: (...args: any[]) => void,
            onCompleteAllParams?: any[],
            onCompleteAllScope?: any
        ): TimelineLite;

        /**
         * Adds a TweenLite.to() tween to the end of the timeline (or elsewhere using the "position" parameter) - this is a convenience method that accomplishes exactly the same thing as
         * add( TweenLite.to(...) ) but with less code.
         */
        to(target: {}, duration: number, vars: {}, position?: any): TimelineLite;
        usesFrames(): boolean;

        /** If true, the timeline's timing mode is frames-based instead of seconds. */
        useFrames(): boolean;
    }

    class TimelineMax extends TimelineLite {
        constructor(vars?: {});

        addCallback(callback: (...args: any[]) => void, position: any, params?: any[], scope?: any): TimelineMax;
        currentLabel(): string;
        currentLabel(value: string): TimelineMax;
        getActive(nested?: boolean, tweens?: boolean, timelines?: boolean): Tween | Timeline[];
        getLabelAfter(time: number): string;
        getLabelBefore(time: number): string;
        getLabelsArray(): Array<{ name: string; time: number }>;
        removeCallback(callback: (...args: any[]) => void, timeOrLabel?: any): TimelineMax;
        removePause(position: any): TimelineMax;
        repeat(): number;
        repeat(value: number): TimelineMax;
        repeatDelay(): number;
        repeatDelay(value: number): TimelineMax;
        tweenFromTo(fromPosition: any, toPosition: any, vars?: {}): TweenLite;
        tweenTo(position: any, vars?: {}): TweenLite;
        yoyo(): boolean;
        yoyo(value: boolean): TimelineMax;
    }
}