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diff --git a/js/src/collapse.js b/js/src/collapse.js
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+++ b/js/src/collapse.js
@@ -0,0 +1,302 @@
+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap (v5.2.3): collapse.js
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
+ * --------------------------------------------------------------------------
+ */
+
+import {
+  defineJQueryPlugin,
+  getElement,
+  getElementFromSelector,
+  getSelectorFromElement,
+  reflow
+} from './util/index'
+import EventHandler from './dom/event-handler'
+import SelectorEngine from './dom/selector-engine'
+import BaseComponent from './base-component'
+
+/**
+ * Constants
+ */
+
+const NAME = 'collapse'
+const DATA_KEY = 'bs.collapse'
+const EVENT_KEY = `.${DATA_KEY}`
+const DATA_API_KEY = '.data-api'
+
+const EVENT_SHOW = `show${EVENT_KEY}`
+const EVENT_SHOWN = `shown${EVENT_KEY}`
+const EVENT_HIDE = `hide${EVENT_KEY}`
+const EVENT_HIDDEN = `hidden${EVENT_KEY}`
+const EVENT_CLICK_DATA_API = `click${EVENT_KEY}${DATA_API_KEY}`
+
+const CLASS_NAME_SHOW = 'show'
+const CLASS_NAME_COLLAPSE = 'collapse'
+const CLASS_NAME_COLLAPSING = 'collapsing'
+const CLASS_NAME_COLLAPSED = 'collapsed'
+const CLASS_NAME_DEEPER_CHILDREN = `:scope .${CLASS_NAME_COLLAPSE} .${CLASS_NAME_COLLAPSE}`
+const CLASS_NAME_HORIZONTAL = 'collapse-horizontal'
+
+const WIDTH = 'width'
+const HEIGHT = 'height'
+
+const SELECTOR_ACTIVES = '.collapse.show, .collapse.collapsing'
+const SELECTOR_DATA_TOGGLE = '[data-bs-toggle="collapse"]'
+
+const Default = {
+  parent: null,
+  toggle: true
+}
+
+const DefaultType = {
+  parent: '(null|element)',
+  toggle: 'boolean'
+}
+
+/**
+ * Class definition
+ */
+
+class Collapse extends BaseComponent {
+  constructor(element, config) {
+    super(element, config)
+
+    this._isTransitioning = false
+    this._triggerArray = []
+
+    const toggleList = SelectorEngine.find(SELECTOR_DATA_TOGGLE)
+
+    for (const elem of toggleList) {
+      const selector = getSelectorFromElement(elem)
+      const filterElement = SelectorEngine.find(selector)
+        .filter(foundElement => foundElement === this._element)
+
+      if (selector !== null && filterElement.length) {
+        this._triggerArray.push(elem)
+      }
+    }
+
+    this._initializeChildren()
+
+    if (!this._config.parent) {
+      this._addAriaAndCollapsedClass(this._triggerArray, this._isShown())
+    }
+
+    if (this._config.toggle) {
+      this.toggle()
+    }
+  }
+
+  // Getters
+  static get Default() {
+    return Default
+  }
+
+  static get DefaultType() {
+    return DefaultType
+  }
+
+  static get NAME() {
+    return NAME
+  }
+
+  // Public
+  toggle() {
+    if (this._isShown()) {
+      this.hide()
+    } else {
+      this.show()
+    }
+  }
+
+  show() {
+    if (this._isTransitioning || this._isShown()) {
+      return
+    }
+
+    let activeChildren = []
+
+    // find active children
+    if (this._config.parent) {
+      activeChildren = this._getFirstLevelChildren(SELECTOR_ACTIVES)
+        .filter(element => element !== this._element)
+        .map(element => Collapse.getOrCreateInstance(element, { toggle: false }))
+    }
+
+    if (activeChildren.length && activeChildren[0]._isTransitioning) {
+      return
+    }
+
+    const startEvent = EventHandler.trigger(this._element, EVENT_SHOW)
+    if (startEvent.defaultPrevented) {
+      return
+    }
+
+    for (const activeInstance of activeChildren) {
+      activeInstance.hide()
+    }
+
+    const dimension = this._getDimension()
+
+    this._element.classList.remove(CLASS_NAME_COLLAPSE)
+    this._element.classList.add(CLASS_NAME_COLLAPSING)
+
+    this._element.style[dimension] = 0
+
+    this._addAriaAndCollapsedClass(this._triggerArray, true)
+    this._isTransitioning = true
+
+    const complete = () => {
+      this._isTransitioning = false
+
+      this._element.classList.remove(CLASS_NAME_COLLAPSING)
+      this._element.classList.add(CLASS_NAME_COLLAPSE, CLASS_NAME_SHOW)
+
+      this._element.style[dimension] = ''
+
+      EventHandler.trigger(this._element, EVENT_SHOWN)
+    }
+
+    const capitalizedDimension = dimension[0].toUpperCase() + dimension.slice(1)
+    const scrollSize = `scroll${capitalizedDimension}`
+
+    this._queueCallback(complete, this._element, true)
+    this._element.style[dimension] = `${this._element[scrollSize]}px`
+  }
+
+  hide() {
+    if (this._isTransitioning || !this._isShown()) {
+      return
+    }
+
+    const startEvent = EventHandler.trigger(this._element, EVENT_HIDE)
+    if (startEvent.defaultPrevented) {
+      return
+    }
+
+    const dimension = this._getDimension()
+
+    this._element.style[dimension] = `${this._element.getBoundingClientRect()[dimension]}px`
+
+    reflow(this._element)
+
+    this._element.classList.add(CLASS_NAME_COLLAPSING)
+    this._element.classList.remove(CLASS_NAME_COLLAPSE, CLASS_NAME_SHOW)
+
+    for (const trigger of this._triggerArray) {
+      const element = getElementFromSelector(trigger)
+
+      if (element && !this._isShown(element)) {
+        this._addAriaAndCollapsedClass([trigger], false)
+      }
+    }
+
+    this._isTransitioning = true
+
+    const complete = () => {
+      this._isTransitioning = false
+      this._element.classList.remove(CLASS_NAME_COLLAPSING)
+      this._element.classList.add(CLASS_NAME_COLLAPSE)
+      EventHandler.trigger(this._element, EVENT_HIDDEN)
+    }
+
+    this._element.style[dimension] = ''
+
+    this._queueCallback(complete, this._element, true)
+  }
+
+  _isShown(element = this._element) {
+    return element.classList.contains(CLASS_NAME_SHOW)
+  }
+
+  // Private
+  _configAfterMerge(config) {
+    config.toggle = Boolean(config.toggle) // Coerce string values
+    config.parent = getElement(config.parent)
+    return config
+  }
+
+  _getDimension() {
+    return this._element.classList.contains(CLASS_NAME_HORIZONTAL) ? WIDTH : HEIGHT
+  }
+
+  _initializeChildren() {
+    if (!this._config.parent) {
+      return
+    }
+
+    const children = this._getFirstLevelChildren(SELECTOR_DATA_TOGGLE)
+
+    for (const element of children) {
+      const selected = getElementFromSelector(element)
+
+      if (selected) {
+        this._addAriaAndCollapsedClass([element], this._isShown(selected))
+      }
+    }
+  }
+
+  _getFirstLevelChildren(selector) {
+    const children = SelectorEngine.find(CLASS_NAME_DEEPER_CHILDREN, this._config.parent)
+    // remove children if greater depth
+    return SelectorEngine.find(selector, this._config.parent).filter(element => !children.includes(element))
+  }
+
+  _addAriaAndCollapsedClass(triggerArray, isOpen) {
+    if (!triggerArray.length) {
+      return
+    }
+
+    for (const element of triggerArray) {
+      element.classList.toggle(CLASS_NAME_COLLAPSED, !isOpen)
+      element.setAttribute('aria-expanded', isOpen)
+    }
+  }
+
+  // Static
+  static jQueryInterface(config) {
+    const _config = {}
+    if (typeof config === 'string' && /show|hide/.test(config)) {
+      _config.toggle = false
+    }
+
+    return this.each(function () {
+      const data = Collapse.getOrCreateInstance(this, _config)
+
+      if (typeof config === 'string') {
+        if (typeof data[config] === 'undefined') {
+          throw new TypeError(`No method named "${config}"`)
+        }
+
+        data[config]()
+      }
+    })
+  }
+}
+
+/**
+ * Data API implementation
+ */
+
+EventHandler.on(document, EVENT_CLICK_DATA_API, SELECTOR_DATA_TOGGLE, function (event) {
+  // preventDefault only for <a> elements (which change the URL) not inside the collapsible element
+  if (event.target.tagName === 'A' || (event.delegateTarget && event.delegateTarget.tagName === 'A')) {
+    event.preventDefault()
+  }
+
+  const selector = getSelectorFromElement(this)
+  const selectorElements = SelectorEngine.find(selector)
+
+  for (const element of selectorElements) {
+    Collapse.getOrCreateInstance(element, { toggle: false }).toggle()
+  }
+})
+
+/**
+ * jQuery
+ */
+
+defineJQueryPlugin(Collapse)
+
+export default Collapse