@phaserjs/phaser/renderer/webgl1/textures/SupportsCompressedTexture.js

Phaser 4

import { WebGLRendererInstance } from "../WebGLRendererInstance";
export function SupportsCompressedTexture(baseFormat, format) {
  const renderer = WebGLRendererInstance.get();
  if (renderer) {
    const supportedFormats = renderer.compression[baseFormat.toUpperCase()];
    if (supportedFormats) {
      if (format) {
        return format in supportedFormats;
      } else {
        return true;
      }
    }
  }
  return false;
}