ohif-viewer/src/utils/initWebWorkers.js

import cornerstoneWADOImageLoader from 'cornerstone-wado-image-loader';

/**
 *
 * @param {String} baseDirectory
 * @param {String} webWorkScriptsPath
 */
export default function initWebWorkers(
  baseDirectory = '/',
  webWorkScriptsPath = ''
) {
  let scriptsPath = `${window.location.protocol}//${
    window.location.host
  }${baseDirectory}${webWorkScriptsPath}`;

  // Ensure the last character is a slash
  if (scriptsPath[scriptsPath.length - 1] !== '/') {
    scriptsPath += '/';
  }
  
  const config = {
    maxWebWorkers: Math.max(navigator.hardwareConcurrency - 1, 1),
    startWebWorkersOnDemand: true,
    webWorkerPath: `${scriptsPath}cornerstoneWADOImageLoaderWebWorker.min.js`,
    taskConfiguration: {
      decodeTask: {
        loadCodecsOnStartup: true,
        initializeCodecsOnStartup: false,
        codecsPath: `${scriptsPath}cornerstoneWADOImageLoaderCodecs.min.js`,
        usePDFJS: false,
        strict: false,
      },
    },
  };

  cornerstoneWADOImageLoader.webWorkerManager.initialize(config);
}