How to use the babylonjs-gltf2interface.AnimationChannelTargetPath.WEIGHTS function in babylonjs-gltf2interface

public _loadAnimationChannelAsync(context: string, animationContext: string, animation: IAnimation, channel: IAnimationChannel, babylonAnimationGroup: AnimationGroup, animationTargetOverride: Nullable = null): Promise {
        if (channel.target.node == undefined) {
            return Promise.resolve();
        }

        const targetNode = ArrayItem.Get(`${context}/target/node`, this._gltf.nodes, channel.target.node);

        // Ignore animations that have no animation targets.
        if ((channel.target.path === AnimationChannelTargetPath.WEIGHTS && !targetNode._numMorphTargets) ||
            (channel.target.path !== AnimationChannelTargetPath.WEIGHTS && !targetNode._babylonTransformNode)) {
            return Promise.resolve();
        }

        const sampler = ArrayItem.Get(`${context}/sampler`, animation.samplers, channel.sampler);
        return this._loadAnimationSamplerAsync(`${animationContext}/samplers/${channel.sampler}`, sampler).then((data) => {
            let targetPath: string;
            let animationType: number;
            switch (channel.target.path) {
                case AnimationChannelTargetPath.TRANSLATION: {
                    targetPath = "position";
                    animationType = Animation.ANIMATIONTYPE_VECTOR3;
                    break;
                }
                case AnimationChannelTargetPath.ROTATION: {
                    targetPath = "rotationQuaternion";
                    animationType = Animation.ANIMATIONTYPE_QUATERNION;

public _loadAnimationChannelAsync(context: string, animationContext: string, animation: IAnimation, channel: IAnimationChannel, babylonAnimationGroup: AnimationGroup, animationTargetOverride: Nullable = null): Promise {
        if (channel.target.node == undefined) {
            return Promise.resolve();
        }

        const targetNode = ArrayItem.Get(`${context}/target/node`, this._gltf.nodes, channel.target.node);

        // Ignore animations that have no animation targets.
        if ((channel.target.path === AnimationChannelTargetPath.WEIGHTS && !targetNode._numMorphTargets) ||
            (channel.target.path !== AnimationChannelTargetPath.WEIGHTS && !targetNode._babylonTransformNode)) {
            return Promise.resolve();
        }

        const sampler = ArrayItem.Get(`${context}/sampler`, animation.samplers, channel.sampler);
        return this._loadAnimationSamplerAsync(`${animationContext}/samplers/${channel.sampler}`, sampler).then((data) => {
            let targetPath: string;
            let animationType: number;
            switch (channel.target.path) {
                case AnimationChannelTargetPath.TRANSLATION: {
                    targetPath = "position";
                    animationType = Animation.ANIMATIONTYPE_VECTOR3;
                    break;
                }
                case AnimationChannelTargetPath.ROTATION: {
                    targetPath = "rotationQuaternion";

private _loadAnimationChannelAsync(context: string, animationContext: string, animation: IAnimation, channel: IAnimationChannel, babylonAnimationGroup: AnimationGroup): Promise {
        if (channel.target.node == undefined) {
            return Promise.resolve();
        }

        const targetNode = ArrayItem.Get(`${context}/target/node`, this._gltf.nodes, channel.target.node);

        // Ignore animations that have no animation targets.
        if ((channel.target.path === AnimationChannelTargetPath.WEIGHTS && !targetNode._numMorphTargets) ||
            (channel.target.path !== AnimationChannelTargetPath.WEIGHTS && !targetNode._babylonTransformNode)) {
            return Promise.resolve();
        }

        const sampler = ArrayItem.Get(`${context}/sampler`, animation.samplers, channel.sampler);
        return this._loadAnimationSamplerAsync(`${animationContext}/samplers/${channel.sampler}`, sampler).then((data) => {
            let targetPath: string;
            let animationType: number;
            switch (channel.target.path) {
                case AnimationChannelTargetPath.TRANSLATION: {
                    targetPath = "position";
                    animationType = Animation.ANIMATIONTYPE_VECTOR3;
                    break;
                }
                case AnimationChannelTargetPath.ROTATION: {
                    targetPath = "rotationQuaternion";

private _loadAnimationChannelAsync(context: string, animationContext: string, animation: IAnimation, channel: IAnimationChannel, babylonAnimationGroup: AnimationGroup): Promise {
        if (channel.target.node == undefined) {
            return Promise.resolve();
        }

        const targetNode = ArrayItem.Get(`${context}/target/node`, this._gltf.nodes, channel.target.node);

        // Ignore animations that have no animation targets.
        if ((channel.target.path === AnimationChannelTargetPath.WEIGHTS && !targetNode._numMorphTargets) ||
            (channel.target.path !== AnimationChannelTargetPath.WEIGHTS && !targetNode._babylonTransformNode)) {
            return Promise.resolve();
        }

        const sampler = ArrayItem.Get(`${context}/sampler`, animation.samplers, channel.sampler);
        return this._loadAnimationSamplerAsync(`${animationContext}/samplers/${channel.sampler}`, sampler).then((data) => {
            let targetPath: string;
            let animationType: number;
            switch (channel.target.path) {
                case AnimationChannelTargetPath.TRANSLATION: {
                    targetPath = "position";
                    animationType = Animation.ANIMATIONTYPE_VECTOR3;
                    break;
                }
                case AnimationChannelTargetPath.ROTATION: {
                    targetPath = "rotationQuaternion";
                    animationType = Animation.ANIMATIONTYPE_QUATERNION;

case AnimationChannelTargetPath.TRANSLATION: {
                    targetPath = "position";
                    animationType = Animation.ANIMATIONTYPE_VECTOR3;
                    break;
                }
                case AnimationChannelTargetPath.ROTATION: {
                    targetPath = "rotationQuaternion";
                    animationType = Animation.ANIMATIONTYPE_QUATERNION;
                    break;
                }
                case AnimationChannelTargetPath.SCALE: {
                    targetPath = "scaling";
                    animationType = Animation.ANIMATIONTYPE_VECTOR3;
                    break;
                }
                case AnimationChannelTargetPath.WEIGHTS: {
                    targetPath = "influence";
                    animationType = Animation.ANIMATIONTYPE_FLOAT;
                    break;
                }
                default: {
                    throw new Error(`${context}/target/path: Invalid value (${channel.target.path})`);
                }
            }

            let outputBufferOffset = 0;
            let getNextOutputValue: () => Vector3 | Quaternion | Array;
            switch (targetPath) {
                case "position": {
                    getNextOutputValue = () => {
                        const value = Vector3.FromArray(data.output, outputBufferOffset);
                        outputBufferOffset += 3;

case AnimationChannelTargetPath.TRANSLATION: {
                    targetPath = "position";
                    animationType = Animation.ANIMATIONTYPE_VECTOR3;
                    break;
                }
                case AnimationChannelTargetPath.ROTATION: {
                    targetPath = "rotationQuaternion";
                    animationType = Animation.ANIMATIONTYPE_QUATERNION;
                    break;
                }
                case AnimationChannelTargetPath.SCALE: {
                    targetPath = "scaling";
                    animationType = Animation.ANIMATIONTYPE_VECTOR3;
                    break;
                }
                case AnimationChannelTargetPath.WEIGHTS: {
                    targetPath = "influence";
                    animationType = Animation.ANIMATIONTYPE_FLOAT;
                    break;
                }
                default: {
                    throw new Error(`${context}/target/path: Invalid value (${channel.target.path})`);
                }
            }

            let outputBufferOffset = 0;
            let getNextOutputValue: () => Vector3 | Quaternion | Array;
            switch (targetPath) {
                case "position": {
                    getNextOutputValue = () => {
                        const value = Vector3.FromArray(data.output, outputBufferOffset);
                        outputBufferOffset += 3;