Marked@5.1.0 crashes in Hermes (React Native) environment

[birdofpreyru]

Marked version: 5.1.0

Describe the bug
When marked module is loaded, the following line gets called with regex equal ^((?![*_])[\s\p{P}$+<=>`|~]), which is deemed to be an invalid regular expression by Hermes engine (namely, it calls the error "Invalid escape", not giving more specific details), thus it throws on this line crashing the host app

marked/src/helpers.js

Line 66 in a26f002

return new RegExp(regex, opt);

It did not happen in the previous, v5.0.5 of marked.

To Reproduce
Steps to reproduce the behavior:

Expected behavior
A clear and concise description of what you expected to happen.

[UziTech]

This sounds like a bug in Hermes. Unicode escapes have been in JavaScript since ES 2018.

[UziTech]

One option is to use babel-plugin-transform-unicode-escapes and compile marked yourself to use older browser engines

[birdofpreyru]

Thanks @UziTech , I double-checked it indeed fails on \p{P}, and reported the bug in Hermes repo (facebook/hermes#1027).

[djMax]

How is this solved (real question, not snark)? I just tried a fresh project with latest and hermes still breaks on the regex.

[UziTech]

This is an issue in Hermes not marked see facebook/hermes#1027