WebGLTextureUtils is an addon, and must be imported explicitly, see Installation#Addons.
import * as WebGLTextureUtils from 'three/addons/utils/WebGLTextureUtils.js';
Returns an uncompressed version of the given compressed texture.
This module can only be used with WebGLRenderer. When using WebGPURenderer, import the function from WebGPUTextureUtils.
texture
The compressed texture.
maxTextureSize
The maximum size of the uncompressed texture.
Default is Infinity.
renderer
A reference to a renderer.
Default is null.
Returns: The uncompressed texture.