Slowdown on compress image with modified RegExp prototype

[filipevserra]

Uploading a huge image to the demo site (https://image-library.app/) in the "Upload and Compress Image", it'll take a long time to finish if some extensions or libs change the prototype of RegExp. Reducing the steps to the minimum to reproduce the problem, I have:

• Open https://image-library.app/
• In browser console run the line: globalThis.Object["defineProperty"](globalThis.RegExp.prototype, 'mynewproperty', {});
• Click on Upload and Compress Image and chose a huge image (7MB or more) It'll take almost 30 seconds to conclude. Without the change on RegExp prototype, it takes only 2 or 3 seconds.

Thirdy party products to protect JS code can causes this changes on RegExp.

The problem occurs only on Chrome and Edge. Firefox works fine.

[dfa1234]

Very interesting issue

There are some regex in the code

const isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
const isIOS = /iPad|iPhone|iPod/i.test(navigator.userAgent);

For now the only solution for you is to only use the compress function, and do the upload on your side.

I will investigate because it's interesting, but it is in low priority for now.