Add option not to use a blob: URL for the worker source

src/browser/index.js

@@ -124,10 +124,11 @@ exports.defaultOptions = {
  * @param {object} instance - TesseractWorker instance
  * @param {object} options
  * @param {string} options.workerPath - worker script path
+ * @param {boolean} options.workerBlobURL - Use a blob:// URL for the worker script
  */
-exports.spawnWorker = (instance, { workerPath }) => {
+exports.spawnWorker = (instance, { workerPath, workerBlobURL }) => {
   let worker;
-  if (Blob && URL) {
+  if (Blob && URL && workerBlobURL) {
     const blob = new Blob([`importScripts("${workerPath}");`], {
       type: 'application/javascript',
     });

src/common/TesseractWorker.js

@@ -32,6 +32,7 @@ class TesseractWorker {
    *     In browser-like environment, it is downloaded from a CDN service.
    *     Please update this option if you self-host the worker script.
    *     In Node.js environment, this option is not used as the worker script is in local.
+   * @param {boolean} [options.workerBlobURL=true] - Use a blob: URL for the worker script
    * @param {string} options.corePath -
    *     A remote path to load tesseract.js-core script.
    *     In browser-like environment, it is downloaded from a CDN service.

src/common/options.js

@@ -8,6 +8,10 @@ module.exports = {
      * of 20 MB.
      */
     langPath: 'https://tessdata.projectnaptha.com/4.0.0',
+    /*
+     * Use BlobURL for worker script by default
+     */
+    workerBlobURL: true,
   },
   /*
    * default params for recognize()