negated regex with positive lookbehind inside parentheses breaks highlighting

[pushkine]

const x = 0
;/\n/g.test(x)
if (!/(?<=a)bc/.test(x)) {
    const x = 0
    ;/\n/g.test(x)
}

1.43

it has issues coloring const, export and I think class methods but it will not break everything right away, I did not manage to find what but combining this with some specific regex or template literal further in the file eventually breaks it completely

possibly related to microsoft/TypeScript-TmLanguage#809

[gjsjohnmurray]

Looks like this is the same as microsoft/TypeScript-TmLanguage#806

[pushkine]

actually the bug happens with any regex that includes a ? as long as it is preceded by a !

!/x?/

the issue linked by @gjsjohnmurray only breaks highlighting within the regex, this one breaks it for the rest of the file

[mjbvz]

Duplicate of microsoft/TypeScript-TmLanguage#806