Does not work in Basilisk v2021.04.27

[tmpuserforbugreport]

It shows only a blank page (with all adblocker/umatrix etc. disabled).
Web console says:

12:22:39.359 SyntaxError: test for equality (==) mistyped as assignment (=)? web.js:8:76
12:22:39.359 SyntaxError: expected expression, got '.' web.js:224:52

[nin-jin]

Unfortunately, PaleMoon-based browsers still don't support ES6.

[tmpuserforbugreport]

PaleMoon browsers do support ES6 from v27. As a matter of fact Basilisk even "Implemented several ECMAScript 2019 features". So the issue is with some particular features that are used by search.hyoo.ru but not implemented in Basilisk. Unfortunately, I do not know js well enough to check this myself. May I kindly ask you to identify the missing feature(s) to report it to PaleMoon/Basilisk developers for implementation or (much more appreciated way) to make a workaround for your quite useful service to avoid using features, that cause malfunction in in Basilisk v2021.04.27?

Thank you in advance!

[nin-jin]

I have found 2 unimplemented features:

• dynamic import
• optional chaining operator