Per IRC, seems this started in the last week. Only related change seems to be the Minify work from reading changelogs.

The source code doesn't have the syntax error: https://phabricator.wikimedia.org/diffusion/ESHG/browse/master/modules/ve-syntaxhighlight/ve.ui.MWSyntaxHighlightDialogTool.js$17

Visual editor loads fine for me on the linked page.

Did more than one person report this problem? @Rtnf If you're the only affected person, the code might have been randomly corrupted after being cached on your computer – try clearing "local storage" in your browser.

If more folks are affected, then it might have been corrupted at some other stage, and we should investigate.

By the way, there's just a 1 bit difference between i and ) (01101001 vs 00101001), so it sure looks like a random bit flip. But it could be good to see at which point it happened.

I've cleared local storage, but the error keep persisting..
I opened an incognito tab, but i found a new kind of error (even though it's basically the same : random bit flip)

I changed my browser from Brave 1.20.110 to Firefox 85.0, now it's working properly on Firefox

I upgraded my Brave browser to 1.21.76 , deleted everything (not just "Empty Cache and Hard Reload" on devtools, but "brave://settings/clearBrowserData" , check everything and choose "all time".)

Now, it's finally working.

@Rtnf If this keeps happening, it could be a problem with your hardware (RAM or perhaps disk). I'm not really knowledgeable about this, but consider making a backup of everything to another device before it gets worse.

It's not me. But a moment ago, someone else also reported the same exact problem like this.
Is it really client-side corruption, or maybe, something else?