Allow Ligatures in more places in Sanctuary.js's docs. Intended for use alongside a custom CSS theme that applies a font like Fira Code.

ligatures-for-sanctuary.user.js

// ==UserScript==
// @name         Ligatures for Sanctuary.js Docs
// @namespace    https://gist.github.com/r-k-b/
// @version      0.1
// @description  Allow Ligatures in more places in Sanctuary.js's docs. Intended for use alongside a custom CSS theme that applies a font like Fira Code.
// @author       Robert K. Bell
// @homepage     https://gist.github.com/r-k-b/dd02d4e641826a721dec112d40b90630
// @downloadURL  https://gist.github.com/r-k-b/dd02d4e641826a721dec112d40b90630/raw/ligatures-for-sanctuary.user.js
// @match        https://sanctuary.js.org/*
// @grant        none
// @run-at       document-idle
// ==/UserScript==

/* jshint esnext: true */

(function(){
    const gap = /\u2060/g;

    function stripSpan(el) {
        const parent = el.parentNode;

        while (el.childNodes.length > 0) {
            nextChild = el.childNodes[0];

            parent.insertBefore(nextChild, el);
        }

        parent.removeChild(el);

        parent.normalize();

        // strip invisible whitespace
        for (i=parent.childNodes.length; i>0; i--) {
            let e = parent.childNodes[i-1];
            if (e.nodeType == Node.TEXT_NODE) {
                e.nodeValue = gap[Symbol.replace](e.nodeValue, '');
            }
        }
    }

    const hyphens = Array.prototype.slice.call(
        document.querySelectorAll('.arrow-hyphen')
    );

    hyphens.forEach(stripSpan);

})();