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.preventBlobURL - do not use a blob: URL for the worker script
  */
-exports.spawnWorker = (instance, { workerPath }) => {
+exports.spawnWorker = (instance, { workerPath, preventBlobURL }) => {
   let worker;
-  if (Blob && URL) {
+  if (Blob && URL && !preventBlobURL) {
     const blob = new Blob([`importScripts("${workerPath}");`], {
       type: 'application/javascript',
     });

src/common/TesseractWorker.js

@@ -43,6 +43,7 @@ class TesseractWorker {
    * @param {string} [options.cachePath=.] - @see {@link https://github.com/jeromewu/tesseract.js-utils/blob/master/src/loadLang.js}
    * @param {string} [options.cacheMethod=write] - @see {@link https://github.com/jeromewu/tesseract.js-utils/blob/master/src/loadLang.js}
    * @param {string} [options.dataPath=.] - @see {@link https://github.com/jeromewu/tesseract.js-utils/blob/master/src/loadLang.js}
+   * @param {boolean} [options.preventBlobURL=false] - do not use a blob: URL for the worker script
    *
    */
   constructor(options = {}) {

src/common/options.js

@@ -8,6 +8,7 @@ module.exports = {
      * of 20 MB.
      */
     langPath: 'https://tessdata.projectnaptha.com/4.0.0',
+    preventBlobURL: false,
   },
   /*
    * default params for recognize()