@loaders.gl/textures/src/lib/parsers/crunch-module-loader.ts

Framework-independent loaders for compressed and super compressed (basis) textures

// loaders.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors

// @ts-nocheck
import {getJSModuleOrNull, LoaderOptions, registerJSModules} from '@loaders.gl/loader-utils';
import {loadLibrary} from '@loaders.gl/worker-utils';

export const CRUNCH_EXTERNAL_LIBRARIES = {
  /** Crunch decoder library. It is used as dynamically imported script */
  DECODER: 'crunch.js'
};

/**
 * Load crunch decoder module
 * @param options - loader options
 * @returns Promise of module object
 */
export async function loadCrunchModule(options: LoaderOptions): Promise<any> {
  registerJSModules(options.modules);
  const crunch = getJSModuleOrNull('crunch');
  if (crunch) {
    return crunch;
  }

  return loadCrunch(options);
}

let crunchModule;

/**
 * Load crunch decoder module
 * @param {any} options - Loader options
 * @returns {Promise<any>} Promise of Module object
 */
async function loadCrunch(options: LoaderOptions): Promise<any> {
  if (crunchModule) {
    return crunchModule;
  }

  let loadCrunchDecoder = await loadLibrary(CRUNCH_EXTERNAL_LIBRARIES.DECODER, 'textures', options);

  // Depends on how import happened...
  // @ts-ignore TS2339: Property does not exist on type
  loadCrunchDecoder ||= globalThis.LoadCrunchDecoder;
  crunchModule = loadCrunchDecoder();
  return crunchModule;
}