I sniffed the javascript source listener on the docs page (I don't know why they don't make this more obvious tbh) and here it is for anyone else who may benefit.
Please note below I commented out a cookies aspect which I did not have defined and was throwing an error and seemed unimportant for my purposes.
"use strict";
document.addEventListener("DOMContentLoaded", function () {
  // Search
  var setSearchToggle = function setSearchToggle() {
    var icon = document.getElementById("searchIcon");
    var search = document.getElementById("search");
    var input = document.getElementById("algoliaSearch");
    if (!icon) {
      return;
    }
    icon.addEventListener("click", function (event) {
      search.classList.toggle("bd-is-visible");
      if (search.classList.contains("bd-is-visible")) {
        algoliaSearch.focus();
      }
    });
    window.addEventListener("keydown", function (event) {
      if (event.key === "Escape") {
        return search.classList.remove("bd-is-visible");
      }
    });
  };
  setSearchToggle();
  // Navbar
  var setNavbarVisibility = function setNavbarVisibility() {
    var navbar = document.getElementById("navbar");
    if (!navbar) {
      return;
    }
    var cs = getComputedStyle(navbar);
    var paddingX = parseFloat(cs.paddingLeft) + parseFloat(cs.paddingRight);
    var brand = navbar.querySelector(".navbar-brand");
    var end = navbar.querySelector(".navbar-end");
    var search = navbar.querySelector(".bd-search");
    var original = document.getElementById("navbarStartOriginal");
    var clone = document.getElementById("navbarStartClone");
    var rest = navbar.clientWidth - paddingX - brand.clientWidth - end.clientWidth - search.clientWidth;
    var space = original.clientWidth;
    var all = document.querySelectorAll("#navbarStartClone > .bd-navbar-item");
    var base = document.querySelectorAll("#navbarStartClone > .bd-navbar-item-base");
    var more = document.querySelectorAll("#navbarStartOriginal > .bd-navbar-item-more");
    var dropdown = document.querySelectorAll("#navbarStartOriginal .bd-navbar-dropdown > .navbar-item");
    var count = 0;
    var totalWidth = 0;
    var showMore = function showMore() {};
    var hideMore = function hideMore() {};
    var _iteratorNormalCompletion = true;
    var _didIteratorError = false;
    var _iteratorError = undefined;
    try {
      for (var _iterator = all[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
        var item = _step.value;
        totalWidth += item.offsetWidth;
        if (totalWidth > rest) {
          break;
        }
        count++;
      }
    } catch (err) {
      _didIteratorError = true;
      _iteratorError = err;
    } finally {
      try {
        if (!_iteratorNormalCompletion && _iterator.return) {
          _iterator.return();
        }
      } finally {
        if (_didIteratorError) {
          throw _iteratorError;
        }
      }
    }
    var howManyMore = Math.max(0, count - base.length);
    if (howManyMore > 0) {
      for (var i = 0; i < howManyMore; i++) {
        more[i].classList.add("bd-is-visible");
        dropdown[i].classList.add("bd-is-hidden");
      }
    }
    for (var j = howManyMore; j < more.length; j++) {
      more[j].classList.remove("bd-is-visible");
    }
    for (var k = howManyMore; k < dropdown.length; k++) {
      dropdown[k].classList.remove("bd-is-hidden");
    }
  };
  setNavbarVisibility();
  // Cookies
//  var cookieBookModalName = "bulma_closed_book_modal";
//  var cookieBookModal = Cookies.getJSON(cookieBookModalName) || false;
  // Dropdowns
  var $dropdowns = getAll(".dropdown:not(.is-hoverable)");
  if ($dropdowns.length > 0) {
    $dropdowns.forEach(function ($el) {
      $el.addEventListener("click", function (event) {
        event.stopPropagation();
        $el.classList.toggle("is-active");
      });
    });
    document.addEventListener("click", function (event) {
      closeDropdowns();
    });
  }
  function closeDropdowns() {
    $dropdowns.forEach(function ($el) {
      $el.classList.remove("is-active");
    });
  }
  // Toggles
  var $burgers = getAll(".navbar-burger");
  if ($burgers.length > 0) {
    $burgers.forEach(function ($el) {
      if (!$el.dataset.target) {
        return;
      }
      $el.addEventListener("click", function () {
        var target = $el.dataset.target;
        var $target = document.getElementById(target);
        $el.classList.toggle("is-active");
        $target.classList.toggle("is-active");
      });
    });
  }
  // Modals
  var rootEl = document.documentElement;
  var $modals = getAll(".modal");
  var $modalButtons = getAll(".modal-button");
  var $modalCloses = getAll(".modal-background, .modal-close, .modal-card-head .delete, .modal-card-foot .button");
  if ($modalButtons.length > 0) {
    $modalButtons.forEach(function ($el) {
      $el.addEventListener("click", function () {
        var target = $el.dataset.target;
        openModal(target);
      });
    });
  }
  if ($modalCloses.length > 0) {
    $modalCloses.forEach(function ($el) {
      $el.addEventListener("click", function () {
        closeModals();
      });
    });
  }
  function openModal(target) {
    var $target = document.getElementById(target);
    rootEl.classList.add("is-clipped");
    $target.classList.add("is-active");
  }
  function closeModals() {
    rootEl.classList.remove("is-clipped");
    $modals.forEach(function ($el) {
      $el.classList.remove("is-active");
    });
  }
  document.addEventListener("keydown", function (event) {
    var e = event || window.event;
    if (e.keyCode === 27) {
      closeModals();
      closeDropdowns();
    }
  });
  // Clipboard
  var $highlights = getAll(".highlight");
  var itemsProcessed = 0;
  if ($highlights.length > 0) {
    $highlights.forEach(function ($el) {
      var copyEl = '<button class="button bd-copy">Copy</button>';
      var expandEl = '<button class="button is-small bd-expand">Expand</button>';
      $el.insertAdjacentHTML("beforeend", copyEl);
      var $parent = $el.parentNode;
      if ($parent && $parent.classList.contains("bd-is-more")) {
        var showEl = '<button class="button is-small bd-show"><span class="icon"><i class="fas fa-code"></i></span><strong>Show code</strong></button>';
        $parent.insertAdjacentHTML("afterbegin", showEl);
      } else if ($el.firstElementChild.scrollHeight > 480 && $el.firstElementChild.clientHeight <= 480) {
        $el.insertAdjacentHTML("beforeend", expandEl);
      }
      itemsProcessed++;
      if (itemsProcessed === $highlights.length) {
        addHighlightControls();
      }
    });
  }
  function addHighlightControls() {
    var $highlightButtons = getAll(".highlight .bd-copy, .highlight .bd-expand");
    $highlightButtons.forEach(function ($el) {
      $el.addEventListener("mouseenter", function () {
        $el.parentNode.classList.add("bd-is-hovering");
        $el.parentNode.parentNode.classList.add("bd-is-hovering");
      });
      $el.addEventListener("mouseleave", function () {
        $el.parentNode.classList.remove("bd-is-hovering");
        $el.parentNode.parentNode.classList.remove("bd-is-hovering");
      });
    });
    var $highlightExpands = getAll(".bd-snippet .bd-expand");
    $highlightExpands.forEach(function ($el) {
      $el.addEventListener("click", function () {
        $el.parentNode.firstElementChild.style.maxHeight = "none";
      });
    });
    var $highlightShows = getAll(".bd-snippet .bd-show");
    $highlightShows.forEach(function ($el) {
      $el.addEventListener("click", function () {
        var text = $el.querySelector("strong").textContent;
        var newText = text === "Show code" ? "Hide code" : "Show code";
        $el.querySelector("strong").textContent = newText;
        $el.parentNode.classList.toggle("bd-is-more-clipped");
      });
    });
  }
  setTimeout(function () {
    new Clipboard(".bd-copy", {
      target: function target(trigger) {
        return trigger.previousElementSibling.firstElementChild;
      }
    });
    new Clipboard(".bd-clipboard");
  }, 100);
  // Events
  var resizeTimer = void 0;
  function handleResize() {
    window.clearTimeout(resizeTimer);
    resizeTimer = window.setTimeout(function () {
      setNavbarVisibility();
    }, 10);
  }
  window.addEventListener("resize", handleResize);
  // Utils
  function getAll(selector) {
    var parent = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : document;
    return Array.prototype.slice.call(parent.querySelectorAll(selector), 0);
  }
});