three.js/examples/jsm/utils/GeometryUtils.d.ts

/**
 * @deprecated
 */
export namespace GeometryUtils {
    /**
     * @deprecated Use {@link Geometry#merge geometry.merge( geometry2, matrix, materialIndexOffset )} instead.
     */
    export function merge(geometry1: any, geometry2: any, materialIndexOffset?: any): any;
    /**
     * @deprecated Use {@link Geometry#center geometry.center()} instead.
     */
    export function center(geometry: any): any;
}