three.js/src/animation/tracks/StringKeyframeTrack.js

import { InterpolateDiscrete } from '../../constants.js';
import { KeyframeTrack } from '../KeyframeTrack.js';

/**
 * A Track that interpolates Strings
 */
class StringKeyframeTrack extends KeyframeTrack {}

Object.assign( StringKeyframeTrack.prototype, {

	ValueTypeName: 'string',
	ValueBufferType: Array,

	DefaultInterpolation: InterpolateDiscrete,

	InterpolantFactoryMethodLinear: undefined,

	InterpolantFactoryMethodSmooth: undefined

} );

export { StringKeyframeTrack };