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

import { Mesh } from '../../../src/Three';

export namespace GeometryCompressionUtils {

	export function compressNormals( mesh: Mesh, encodeMethod: String ): void;
	export function compressPositions( mesh: Mesh ): void;
	export function compressUvs( mesh: Mesh ): void;

}