Uncaught DOMException: Failed to execute ‘importScripts’ on ‘WorkerGlobalScope’

21 Aug 20251 minute to read

Another error that can occur when setting up the ej2-pdfviewer-library without the necessary assets is the Uncaught DOMException: Failed to execute ‘importScripts’ on ‘WorkerGlobalScope’. This error typically arises when a web worker attempts to load a script (e.g., pdfium.js or pdfium.wasm) and fails to do so.

To troubleshoot and resolve this error, consider the following steps:

  1. Check Asset Availability: Ensure that the required assets, specifically pdfium.js and pdfium.wasm, are present in the correct locations within your project. Confirm that they are accessible and have been copied correctly.

  2. Network and CORS: Verify that there are no network-related issues preventing the web worker from fetching the assets. Also, address any CORS-related problems, especially if the assets are hosted on a different origin.

NOTE

If ej2-pdfviewer-lib folder is not available in the ‘src/assets’, copy the contents of the ej2-pdfviewer-lib folder from ./node_modules/@syncfusion/ej2-pdfviewer/dist to the src/assets directory using the command:

cp -R ./node_modules/@syncfusion/ej2-pdfviewer/dist/ej2-pdfviewer-lib  src/assets/ej2-pdfviewer-lib