Reason highlight.js
This is the source of truth for Reason's highlight.js integration.
yarn add reason-highlightjsIn your code:
let reasonHighlightJs = require('reason-highlightjs');
hljs.registerLanguage('reason', reasonHighlightJs)The exposed classes for css coloring are plainly written in index.js. Check for the className: ...parts.
index.js is the single source file. yarn test to check whether your modification caused test/expected.html to change. Do read the tests; they're simple.
When a mode has begin but no end, as per the docs, end will default to anything. But this doesn't mean the mode stops immediately; it'll actually cycle through its contains until every sub-mode fails to match.
If you wanna do a big look-ahead in begin then come back and highlight stuff in the region you've captured, through submodes (aka contains), you can't ordinarily, since the submodes matchings start right after the captured begin; too late to highlight that region (except for keywords, which is kinda special-cased as a config, but disregard that)! Instead, you can use returnBegin: true that resets the lexing process back to begin, and then in contains, proceed as desired. Aka this is basically looking-ahead without skipping past the part you've looked. Careful though, since resetting the lexer back to beginning means you might get caught in infinite loops.
contains' order is significant. Top to bottom.