import { AnimationAction, AnimationClip, AnimationMixer, Object3D } from "three";
import type { Context } from "./engine_context.js";
import { IAnimationComponent, Model } from "./engine_types.js";
/**
 * Registry for animation related data. Use {@link registerAnimationMixer} to register an animation mixer instance.
 * Can be accessed from {@link Context.animations} and is used internally e.g. when exporting GLTF files.
 * @category Animation
 */
export declare class AnimationsRegistry {
    readonly context: Context;
    readonly mixers: AnimationMixer[];
    constructor(context: Context);
    /** @hidden @internal */
    onDestroy(): void;
    /**
     * Register an animation mixer instance.
     */
    registerAnimationMixer(mixer: AnimationMixer): void;
    /**
     * Unregister an animation mixer instance.
     */
    unregisterAnimationMixer(mixer: AnimationMixer | null | undefined): void;
}
/**
 * Utility class for working with animations.
 */
export declare class AnimationUtils {
    /**
     * Tries to get the animation actions from an animation mixer.
     * @param mixer The animation mixer to get the actions from
     * @returns The actions or null if the mixer is invalid
     */
    static tryGetActionsFromMixer(mixer: AnimationMixer): Array<AnimationAction> | null;
    static tryGetAnimationClipsFromObjectHierarchy(obj: Object3D, target?: Array<AnimationClip>): Array<AnimationClip>;
    /**
     * Assigns animations from a GLTF file to the objects in the scene.
     * This method will look for objects in the scene that have animations and assign them to the correct objects.
     * @param file The GLTF file to assign the animations from
     */
    static assignAnimationsFromFile(file: Pick<Model, "animations" | "scene">, opts?: {
        createAnimationComponent(obj: Object3D, animation: AnimationClip): IAnimationComponent;
    }): void;
}