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+// Utils
+import debounce from './utils/debounce';
+import isFunction from './utils/isFunction';
+
+// Methods
+import update from './methods/update';
+import destroy from './methods/destroy';
+import enableEventListeners from './methods/enableEventListeners';
+import disableEventListeners from './methods/disableEventListeners';
+import Defaults from './methods/defaults';
+import placements from './methods/placements';
+
+export default class Popper {
+  /**
+   * Creates a new Popper.js instance.
+   * @class Popper
+   * @param {Element|referenceObject} reference - The reference element used to position the popper
+   * @param {Element} popper - The HTML / XML element used as the popper
+   * @param {Object} options - Your custom options to override the ones defined in [Defaults](#defaults)
+   * @return {Object} instance - The generated Popper.js instance
+   */
+  constructor(reference, popper, options = {}) {
+    // make update() debounced, so that it only runs at most once-per-tick
+    this.update = debounce(this.update.bind(this));
+
+    // with {} we create a new object with the options inside it
+    this.options = { ...Popper.Defaults, ...options };
+
+    // init state
+    this.state = {
+      isDestroyed: false,
+      isCreated: false,
+      scrollParents: [],
+    };
+
+    // get reference and popper elements (allow jQuery wrappers)
+    this.reference = reference && reference.jquery ? reference[0] : reference;
+    this.popper = popper && popper.jquery ? popper[0] : popper;
+
+    // Deep merge modifiers options
+    this.options.modifiers = {};
+    Object.keys({
+      ...Popper.Defaults.modifiers,
+      ...options.modifiers,
+    }).forEach(name => {
+      this.options.modifiers[name] = {
+        // If it's a built-in modifier, use it as base
+        ...(Popper.Defaults.modifiers[name] || {}),
+        // If there are custom options, override and merge with default ones
+        ...(options.modifiers ? options.modifiers[name] : {}),
+      };
+    });
+
+    // Refactoring modifiers' list (Object => Array)
+    this.modifiers = Object.keys(this.options.modifiers)
+      .map(name => ({
+        name,
+        ...this.options.modifiers[name],
+      }))
+      // sort the modifiers by order
+      .sort((a, b) => a.order - b.order);
+
+    // modifiers have the ability to execute arbitrary code when Popper.js get inited
+    // such code is executed in the same order of its modifier
+    // they could add new properties to their options configuration
+    // BE AWARE: don't add options to `options.modifiers.name` but to `modifierOptions`!
+    this.modifiers.forEach(modifierOptions => {
+      if (modifierOptions.enabled && isFunction(modifierOptions.onLoad)) {
+        modifierOptions.onLoad(
+          this.reference,
+          this.popper,
+          this.options,
+          modifierOptions,
+          this.state
+        );
+      }
+    });
+
+    // fire the first update to position the popper in the right place
+    this.update();
+
+    const eventsEnabled = this.options.eventsEnabled;
+    if (eventsEnabled) {
+      // setup event listeners, they will take care of update the position in specific situations
+      this.enableEventListeners();
+    }
+
+    this.state.eventsEnabled = eventsEnabled;
+  }
+
+  // We can't use class properties because they don't get listed in the
+  // class prototype and break stuff like Sinon stubs
+  update() {
+    return update.call(this);
+  }
+  destroy() {
+    return destroy.call(this);
+  }
+  enableEventListeners() {
+    return enableEventListeners.call(this);
+  }
+  disableEventListeners() {
+    return disableEventListeners.call(this);
+  }
+
+  /**
+   * Schedules an update. It will run on the next UI update available.
+   * @method scheduleUpdate
+   * @memberof Popper
+   */
+  scheduleUpdate = () => requestAnimationFrame(this.update);
+
+  /**
+   * Collection of utilities useful when writing custom modifiers.
+   * Starting from version 1.7, this method is available only if you
+   * include `popper-utils.js` before `popper.js`.
+   *
+   * **DEPRECATION**: This way to access PopperUtils is deprecated
+   * and will be removed in v2! Use the PopperUtils module directly instead.
+   * Due to the high instability of the methods contained in Utils, we can't
+   * guarantee them to follow semver. Use them at your own risk!
+   * @static
+   * @private
+   * @type {Object}
+   * @deprecated since version 1.8
+   * @member Utils
+   * @memberof Popper
+   */
+  static Utils = (typeof window !== 'undefined' ? window : global).PopperUtils;
+
+  static placements = placements;
+
+  static Defaults = Defaults;
+}
+
+/**
+ * The `referenceObject` is an object that provides an interface compatible with Popper.js
+ * and lets you use it as replacement of a real DOM node.<br />
+ * You can use this method to position a popper relatively to a set of coordinates
+ * in case you don't have a DOM node to use as reference.
+ *
+ * ```
+ * new Popper(referenceObject, popperNode);
+ * ```
+ *
+ * NB: This feature isn't supported in Internet Explorer 10.
+ * @name referenceObject
+ * @property {Function} data.getBoundingClientRect
+ * A function that returns a set of coordinates compatible with the native `getBoundingClientRect` method.
+ * @property {number} data.clientWidth
+ * An ES6 getter that will return the width of the virtual reference element.
+ * @property {number} data.clientHeight
+ * An ES6 getter that will return the height of the virtual reference element.
+ */