'<' and '>' gets escaped twice when used with Prismjs

I am trying to use the library along with Prism highlighting to render a notebook's content. It seems like the notebookjs library html-escapes the '<' and '>' characters before passing it to the highlighter. The highlighter treats it as the actual code and renders it as such by tokenising < and >

Anyway to disable escaping or any recommended way to handle this situation?

I am using the code given on the site to use prism highlighting. ie

`var Prism = require('prismjs');

var highlighter = function(code, lang) {
if (typeof lang === 'undefined') lang = 'markup';

if (!Prism.languages.hasOwnProperty(lang)) {
    try {
        require('prismjs/components/prism-' + lang + '.js');
    } catch (e) {
        console.warn('** failed to load Prism lang: ' + lang);
        Prism.languages[lang] = false;
    }
}
return Prism.languages[lang] ? Prism.highlight(code, Prism.languages[lang]) : code;

};
var nb = require("notebookjs");
nb.highlighter = function(text, pre, code, lang) {
var language = lang || 'text';
pre.className = 'language-' + language;
if (typeof code != 'undefined') {
code.className = 'language-' + language;
}
return highlighter(text, language);
};`

The issue does not name a repository file or test; start with the nb.highlighter callback and the Prism.highlight call shown in the report. Reproduce the double escaping with the supplied integration, then verify that angle brackets are highlighted once rather than tokenised as < and >.