doc.yeswiki.pro/node_modules/focus-trap/dist/focus-trap.js

/*!
* focus-trap 7.4.3
* @license MIT, https://github.com/focus-trap/focus-trap/blob/master/LICENSE
*/
'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var tabbable = require('tabbable');

function ownKeys(object, enumerableOnly) {
  var keys = Object.keys(object);
  if (Object.getOwnPropertySymbols) {
    var symbols = Object.getOwnPropertySymbols(object);
    enumerableOnly && (symbols = symbols.filter(function (sym) {
      return Object.getOwnPropertyDescriptor(object, sym).enumerable;
    })), keys.push.apply(keys, symbols);
  }
  return keys;
}
function _objectSpread2(target) {
  for (var i = 1; i < arguments.length; i++) {
    var source = null != arguments[i] ? arguments[i] : {};
    i % 2 ? ownKeys(Object(source), !0).forEach(function (key) {
      _defineProperty(target, key, source[key]);
    }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) {
      Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
    });
  }
  return target;
}
function _defineProperty(obj, key, value) {
  key = _toPropertyKey(key);
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }
  return obj;
}
function _toPrimitive(input, hint) {
  if (typeof input !== "object" || input === null) return input;
  var prim = input[Symbol.toPrimitive];
  if (prim !== undefined) {
    var res = prim.call(input, hint || "default");
    if (typeof res !== "object") return res;
    throw new TypeError("@@toPrimitive must return a primitive value.");
  }
  return (hint === "string" ? String : Number)(input);
}
function _toPropertyKey(arg) {
  var key = _toPrimitive(arg, "string");
  return typeof key === "symbol" ? key : String(key);
}

var activeFocusTraps = {
  activateTrap: function activateTrap(trapStack, trap) {
    if (trapStack.length > 0) {
      var activeTrap = trapStack[trapStack.length - 1];
      if (activeTrap !== trap) {
        activeTrap.pause();
      }
    }
    var trapIndex = trapStack.indexOf(trap);
    if (trapIndex === -1) {
      trapStack.push(trap);
    } else {
      // move this existing trap to the front of the queue
      trapStack.splice(trapIndex, 1);
      trapStack.push(trap);
    }
  },
  deactivateTrap: function deactivateTrap(trapStack, trap) {
    var trapIndex = trapStack.indexOf(trap);
    if (trapIndex !== -1) {
      trapStack.splice(trapIndex, 1);
    }
    if (trapStack.length > 0) {
      trapStack[trapStack.length - 1].unpause();
    }
  }
};
var isSelectableInput = function isSelectableInput(node) {
  return node.tagName && node.tagName.toLowerCase() === 'input' && typeof node.select === 'function';
};
var isEscapeEvent = function isEscapeEvent(e) {
  return e.key === 'Escape' || e.key === 'Esc' || e.keyCode === 27;
};
var isTabEvent = function isTabEvent(e) {
  return e.key === 'Tab' || e.keyCode === 9;
};

// checks for TAB by default
var isKeyForward = function isKeyForward(e) {
  return isTabEvent(e) && !e.shiftKey;
};

// checks for SHIFT+TAB by default
var isKeyBackward = function isKeyBackward(e) {
  return isTabEvent(e) && e.shiftKey;
};
var delay = function delay(fn) {
  return setTimeout(fn, 0);
};

// Array.find/findIndex() are not supported on IE; this replicates enough
//  of Array.findIndex() for our needs
var findIndex = function findIndex(arr, fn) {
  var idx = -1;
  arr.every(function (value, i) {
    if (fn(value)) {
      idx = i;
      return false; // break
    }

    return true; // next
  });

  return idx;
};

/**
 * Get an option's value when it could be a plain value, or a handler that provides
 *  the value.
 * @param {*} value Option's value to check.
 * @param {...*} [params] Any parameters to pass to the handler, if `value` is a function.
 * @returns {*} The `value`, or the handler's returned value.
 */
var valueOrHandler = function valueOrHandler(value) {
  for (var _len = arguments.length, params = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
    params[_key - 1] = arguments[_key];
  }
  return typeof value === 'function' ? value.apply(void 0, params) : value;
};
var getActualTarget = function getActualTarget(event) {
  // NOTE: If the trap is _inside_ a shadow DOM, event.target will always be the
  //  shadow host. However, event.target.composedPath() will be an array of
  //  nodes "clicked" from inner-most (the actual element inside the shadow) to
  //  outer-most (the host HTML document). If we have access to composedPath(),
  //  then use its first element; otherwise, fall back to event.target (and
  //  this only works for an _open_ shadow DOM; otherwise,
  //  composedPath()[0] === event.target always).
  return event.target.shadowRoot && typeof event.composedPath === 'function' ? event.composedPath()[0] : event.target;
};

// NOTE: this must be _outside_ `createFocusTrap()` to make sure all traps in this
//  current instance use the same stack if `userOptions.trapStack` isn't specified
var internalTrapStack = [];
var createFocusTrap = function createFocusTrap(elements, userOptions) {
  // SSR: a live trap shouldn't be created in this type of environment so this
  //  should be safe code to execute if the `document` option isn't specified
  var doc = (userOptions === null || userOptions === void 0 ? void 0 : userOptions.document) || document;
  var trapStack = (userOptions === null || userOptions === void 0 ? void 0 : userOptions.trapStack) || internalTrapStack;
  var config = _objectSpread2({
    returnFocusOnDeactivate: true,
    escapeDeactivates: true,
    delayInitialFocus: true,
    isKeyForward: isKeyForward,
    isKeyBackward: isKeyBackward
  }, userOptions);
  var state = {
    // containers given to createFocusTrap()
    // @type {Array<HTMLElement>}
    containers: [],
    // list of objects identifying tabbable nodes in `containers` in the trap
    // NOTE: it's possible that a group has no tabbable nodes if nodes get removed while the trap
    //  is active, but the trap should never get to a state where there isn't at least one group
    //  with at least one tabbable node in it (that would lead to an error condition that would
    //  result in an error being thrown)
    // @type {Array<{
    //   container: HTMLElement,
    //   tabbableNodes: Array<HTMLElement>, // empty if none
    //   focusableNodes: Array<HTMLElement>, // empty if none
    //   firstTabbableNode: HTMLElement|null,
    //   lastTabbableNode: HTMLElement|null,
    //   nextTabbableNode: (node: HTMLElement, forward: boolean) => HTMLElement|undefined
    // }>}
    containerGroups: [],
    // same order/length as `containers` list

    // references to objects in `containerGroups`, but only those that actually have
    //  tabbable nodes in them
    // NOTE: same order as `containers` and `containerGroups`, but __not necessarily__
    //  the same length
    tabbableGroups: [],
    nodeFocusedBeforeActivation: null,
    mostRecentlyFocusedNode: null,
    active: false,
    paused: false,
    // timer ID for when delayInitialFocus is true and initial focus in this trap
    //  has been delayed during activation
    delayInitialFocusTimer: undefined
  };
  var trap; // eslint-disable-line prefer-const -- some private functions reference it, and its methods reference private functions, so we must declare here and define later

  /**
   * Gets a configuration option value.
   * @param {Object|undefined} configOverrideOptions If true, and option is defined in this set,
   *  value will be taken from this object. Otherwise, value will be taken from base configuration.
   * @param {string} optionName Name of the option whose value is sought.
   * @param {string|undefined} [configOptionName] Name of option to use __instead of__ `optionName`
   *  IIF `configOverrideOptions` is not defined. Otherwise, `optionName` is used.
   */
  var getOption = function getOption(configOverrideOptions, optionName, configOptionName) {
    return configOverrideOptions && configOverrideOptions[optionName] !== undefined ? configOverrideOptions[optionName] : config[configOptionName || optionName];
  };

  /**
   * Finds the index of the container that contains the element.
   * @param {HTMLElement} element
   * @param {Event} [event]
   * @returns {number} Index of the container in either `state.containers` or
   *  `state.containerGroups` (the order/length of these lists are the same); -1
   *  if the element isn't found.
   */
  var findContainerIndex = function findContainerIndex(element, event) {
    var composedPath = typeof (event === null || event === void 0 ? void 0 : event.composedPath) === 'function' ? event.composedPath() : undefined;
    // NOTE: search `containerGroups` because it's possible a group contains no tabbable
    //  nodes, but still contains focusable nodes (e.g. if they all have `tabindex=-1`)
    //  and we still need to find the element in there
    return state.containerGroups.findIndex(function (_ref) {
      var container = _ref.container,
        tabbableNodes = _ref.tabbableNodes;
      return container.contains(element) || ( // fall back to explicit tabbable search which will take into consideration any
      //  web components if the `tabbableOptions.getShadowRoot` option was used for
      //  the trap, enabling shadow DOM support in tabbable (`Node.contains()` doesn't
      //  look inside web components even if open)
      composedPath === null || composedPath === void 0 ? void 0 : composedPath.includes(container)) || tabbableNodes.find(function (node) {
        return node === element;
      });
    });
  };

  /**
   * Gets the node for the given option, which is expected to be an option that
   *  can be either a DOM node, a string that is a selector to get a node, `false`
   *  (if a node is explicitly NOT given), or a function that returns any of these
   *  values.
   * @param {string} optionName
   * @returns {undefined | false | HTMLElement | SVGElement} Returns
   *  `undefined` if the option is not specified; `false` if the option
   *  resolved to `false` (node explicitly not given); otherwise, the resolved
   *  DOM node.
   * @throws {Error} If the option is set, not `false`, and is not, or does not
   *  resolve to a node.
   */
  var getNodeForOption = function getNodeForOption(optionName) {
    var optionValue = config[optionName];
    if (typeof optionValue === 'function') {
      for (var _len2 = arguments.length, params = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
        params[_key2 - 1] = arguments[_key2];
      }
      optionValue = optionValue.apply(void 0, params);
    }
    if (optionValue === true) {
      optionValue = undefined; // use default value
    }

    if (!optionValue) {
      if (optionValue === undefined || optionValue === false) {
        return optionValue;
      }
      // else, empty string (invalid), null (invalid), 0 (invalid)

      throw new Error("`".concat(optionName, "` was specified but was not a node, or did not return a node"));
    }
    var node = optionValue; // could be HTMLElement, SVGElement, or non-empty string at this point

    if (typeof optionValue === 'string') {
      node = doc.querySelector(optionValue); // resolve to node, or null if fails
      if (!node) {
        throw new Error("`".concat(optionName, "` as selector refers to no known node"));
      }
    }
    return node;
  };
  var getInitialFocusNode = function getInitialFocusNode() {
    var node = getNodeForOption('initialFocus');

    // false explicitly indicates we want no initialFocus at all
    if (node === false) {
      return false;
    }
    if (node === undefined || !tabbable.isFocusable(node, config.tabbableOptions)) {
      // option not specified nor focusable: use fallback options
      if (findContainerIndex(doc.activeElement) >= 0) {
        node = doc.activeElement;
      } else {
        var firstTabbableGroup = state.tabbableGroups[0];
        var firstTabbableNode = firstTabbableGroup && firstTabbableGroup.firstTabbableNode;

        // NOTE: `fallbackFocus` option function cannot return `false` (not supported)
        node = firstTabbableNode || getNodeForOption('fallbackFocus');
      }
    }
    if (!node) {
      throw new Error('Your focus-trap needs to have at least one focusable element');
    }
    return node;
  };
  var updateTabbableNodes = function updateTabbableNodes() {
    state.containerGroups = state.containers.map(function (container) {
      var tabbableNodes = tabbable.tabbable(container, config.tabbableOptions);

      // NOTE: if we have tabbable nodes, we must have focusable nodes; focusable nodes
      //  are a superset of tabbable nodes
      var focusableNodes = tabbable.focusable(container, config.tabbableOptions);
      return {
        container: container,
        tabbableNodes: tabbableNodes,
        focusableNodes: focusableNodes,
        firstTabbableNode: tabbableNodes.length > 0 ? tabbableNodes[0] : null,
        lastTabbableNode: tabbableNodes.length > 0 ? tabbableNodes[tabbableNodes.length - 1] : null,
        /**
         * Finds the __tabbable__ node that follows the given node in the specified direction,
         *  in this container, if any.
         * @param {HTMLElement} node
         * @param {boolean} [forward] True if going in forward tab order; false if going
         *  in reverse.
         * @returns {HTMLElement|undefined} The next tabbable node, if any.
         */
        nextTabbableNode: function nextTabbableNode(node) {
          var forward = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
          // NOTE: If tabindex is positive (in order to manipulate the tab order separate
          //  from the DOM order), this __will not work__ because the list of focusableNodes,
          //  while it contains tabbable nodes, does not sort its nodes in any order other
          //  than DOM order, because it can't: Where would you place focusable (but not
          //  tabbable) nodes in that order? They have no order, because they aren't tabbale...
          // Support for positive tabindex is already broken and hard to manage (possibly
          //  not supportable, TBD), so this isn't going to make things worse than they
          //  already are, and at least makes things better for the majority of cases where
          //  tabindex is either 0/unset or negative.
          // FYI, positive tabindex issue: https://github.com/focus-trap/focus-trap/issues/375
          var nodeIdx = focusableNodes.findIndex(function (n) {
            return n === node;
          });
          if (nodeIdx < 0) {
            return undefined;
          }
          if (forward) {
            return focusableNodes.slice(nodeIdx + 1).find(function (n) {
              return tabbable.isTabbable(n, config.tabbableOptions);
            });
          }
          return focusableNodes.slice(0, nodeIdx).reverse().find(function (n) {
            return tabbable.isTabbable(n, config.tabbableOptions);
          });
        }
      };
    });
    state.tabbableGroups = state.containerGroups.filter(function (group) {
      return group.tabbableNodes.length > 0;
    });

    // throw if no groups have tabbable nodes and we don't have a fallback focus node either
    if (state.tabbableGroups.length <= 0 && !getNodeForOption('fallbackFocus') // returning false not supported for this option
    ) {
      throw new Error('Your focus-trap must have at least one container with at least one tabbable node in it at all times');
    }
  };
  var tryFocus = function tryFocus(node) {
    if (node === false) {
      return;
    }
    if (node === doc.activeElement) {
      return;
    }
    if (!node || !node.focus) {
      tryFocus(getInitialFocusNode());
      return;
    }
    node.focus({
      preventScroll: !!config.preventScroll
    });
    state.mostRecentlyFocusedNode = node;
    if (isSelectableInput(node)) {
      node.select();
    }
  };
  var getReturnFocusNode = function getReturnFocusNode(previousActiveElement) {
    var node = getNodeForOption('setReturnFocus', previousActiveElement);
    return node ? node : node === false ? false : previousActiveElement;
  };

  // This needs to be done on mousedown and touchstart instead of click
  // so that it precedes the focus event.
  var checkPointerDown = function checkPointerDown(e) {
    var target = getActualTarget(e);
    if (findContainerIndex(target, e) >= 0) {
      // allow the click since it ocurred inside the trap
      return;
    }
    if (valueOrHandler(config.clickOutsideDeactivates, e)) {
      // immediately deactivate the trap
      trap.deactivate({
        // NOTE: by setting `returnFocus: false`, deactivate() will do nothing,
        //  which will result in the outside click setting focus to the node
        //  that was clicked (and if not focusable, to "nothing"); by setting
        //  `returnFocus: true`, we'll attempt to re-focus the node originally-focused
        //  on activation (or the configured `setReturnFocus` node), whether the
        //  outside click was on a focusable node or not
        returnFocus: config.returnFocusOnDeactivate
      });
      return;
    }

    // This is needed for mobile devices.
    // (If we'll only let `click` events through,
    // then on mobile they will be blocked anyways if `touchstart` is blocked.)
    if (valueOrHandler(config.allowOutsideClick, e)) {
      // allow the click outside the trap to take place
      return;
    }

    // otherwise, prevent the click
    e.preventDefault();
  };

  // In case focus escapes the trap for some strange reason, pull it back in.
  var checkFocusIn = function checkFocusIn(e) {
    var target = getActualTarget(e);
    var targetContained = findContainerIndex(target, e) >= 0;

    // In Firefox when you Tab out of an iframe the Document is briefly focused.
    if (targetContained || target instanceof Document) {
      if (targetContained) {
        state.mostRecentlyFocusedNode = target;
      }
    } else {
      // escaped! pull it back in to where it just left
      e.stopImmediatePropagation();
      tryFocus(state.mostRecentlyFocusedNode || getInitialFocusNode());
    }
  };

  // Hijack key nav events on the first and last focusable nodes of the trap,
  // in order to prevent focus from escaping. If it escapes for even a
  // moment it can end up scrolling the page and causing confusion so we
  // kind of need to capture the action at the keydown phase.
  var checkKeyNav = function checkKeyNav(event) {
    var isBackward = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
    var target = getActualTarget(event);
    updateTabbableNodes();
    var destinationNode = null;
    if (state.tabbableGroups.length > 0) {
      // make sure the target is actually contained in a group
      // NOTE: the target may also be the container itself if it's focusable
      //  with tabIndex='-1' and was given initial focus
      var containerIndex = findContainerIndex(target, event);
      var containerGroup = containerIndex >= 0 ? state.containerGroups[containerIndex] : undefined;
      if (containerIndex < 0) {
        // target not found in any group: quite possible focus has escaped the trap,
        //  so bring it back into...
        if (isBackward) {
          // ...the last node in the last group
          destinationNode = state.tabbableGroups[state.tabbableGroups.length - 1].lastTabbableNode;
        } else {
          // ...the first node in the first group
          destinationNode = state.tabbableGroups[0].firstTabbableNode;
        }
      } else if (isBackward) {
        // REVERSE

        // is the target the first tabbable node in a group?
        var startOfGroupIndex = findIndex(state.tabbableGroups, function (_ref2) {
          var firstTabbableNode = _ref2.firstTabbableNode;
          return target === firstTabbableNode;
        });
        if (startOfGroupIndex < 0 && (containerGroup.container === target || tabbable.isFocusable(target, config.tabbableOptions) && !tabbable.isTabbable(target, config.tabbableOptions) && !containerGroup.nextTabbableNode(target, false))) {
          // an exception case where the target is either the container itself, or
          //  a non-tabbable node that was given focus (i.e. tabindex is negative
          //  and user clicked on it or node was programmatically given focus)
          //  and is not followed by any other tabbable node, in which
          //  case, we should handle shift+tab as if focus were on the container's
          //  first tabbable node, and go to the last tabbable node of the LAST group
          startOfGroupIndex = containerIndex;
        }
        if (startOfGroupIndex >= 0) {
          // YES: then shift+tab should go to the last tabbable node in the
          //  previous group (and wrap around to the last tabbable node of
          //  the LAST group if it's the first tabbable node of the FIRST group)
          var destinationGroupIndex = startOfGroupIndex === 0 ? state.tabbableGroups.length - 1 : startOfGroupIndex - 1;
          var destinationGroup = state.tabbableGroups[destinationGroupIndex];
          destinationNode = destinationGroup.lastTabbableNode;
        } else if (!isTabEvent(event)) {
          // user must have customized the nav keys so we have to move focus manually _within_
          //  the active group: do this based on the order determined by tabbable()
          destinationNode = containerGroup.nextTabbableNode(target, false);
        }
      } else {
        // FORWARD

        // is the target the last tabbable node in a group?
        var lastOfGroupIndex = findIndex(state.tabbableGroups, function (_ref3) {
          var lastTabbableNode = _ref3.lastTabbableNode;
          return target === lastTabbableNode;
        });
        if (lastOfGroupIndex < 0 && (containerGroup.container === target || tabbable.isFocusable(target, config.tabbableOptions) && !tabbable.isTabbable(target, config.tabbableOptions) && !containerGroup.nextTabbableNode(target))) {
          // an exception case where the target is the container itself, or
          //  a non-tabbable node that was given focus (i.e. tabindex is negative
          //  and user clicked on it or node was programmatically given focus)
          //  and is not followed by any other tabbable node, in which
          //  case, we should handle tab as if focus were on the container's
          //  last tabbable node, and go to the first tabbable node of the FIRST group
          lastOfGroupIndex = containerIndex;
        }
        if (lastOfGroupIndex >= 0) {
          // YES: then tab should go to the first tabbable node in the next
          //  group (and wrap around to the first tabbable node of the FIRST
          //  group if it's the last tabbable node of the LAST group)
          var _destinationGroupIndex = lastOfGroupIndex === state.tabbableGroups.length - 1 ? 0 : lastOfGroupIndex + 1;
          var _destinationGroup = state.tabbableGroups[_destinationGroupIndex];
          destinationNode = _destinationGroup.firstTabbableNode;
        } else if (!isTabEvent(event)) {
          // user must have customized the nav keys so we have to move focus manually _within_
          //  the active group: do this based on the order determined by tabbable()
          destinationNode = containerGroup.nextTabbableNode(target);
        }
      }
    } else {
      // no groups available
      // NOTE: the fallbackFocus option does not support returning false to opt-out
      destinationNode = getNodeForOption('fallbackFocus');
    }
    if (destinationNode) {
      if (isTabEvent(event)) {
        // since tab natively moves focus, we wouldn't have a destination node unless we
        //  were on the edge of a container and had to move to the next/previous edge, in
        //  which case we want to prevent default to keep the browser from moving focus
        //  to where it normally would
        event.preventDefault();
      }
      tryFocus(destinationNode);
    }
    // else, let the browser take care of [shift+]tab and move the focus
  };

  var checkKey = function checkKey(event) {
    if (isEscapeEvent(event) && valueOrHandler(config.escapeDeactivates, event) !== false) {
      event.preventDefault();
      trap.deactivate();
      return;
    }
    if (config.isKeyForward(event) || config.isKeyBackward(event)) {
      checkKeyNav(event, config.isKeyBackward(event));
    }
  };
  var checkClick = function checkClick(e) {
    var target = getActualTarget(e);
    if (findContainerIndex(target, e) >= 0) {
      return;
    }
    if (valueOrHandler(config.clickOutsideDeactivates, e)) {
      return;
    }
    if (valueOrHandler(config.allowOutsideClick, e)) {
      return;
    }
    e.preventDefault();
    e.stopImmediatePropagation();
  };

  //
  // EVENT LISTENERS
  //

  var addListeners = function addListeners() {
    if (!state.active) {
      return;
    }

    // There can be only one listening focus trap at a time
    activeFocusTraps.activateTrap(trapStack, trap);

    // Delay ensures that the focused element doesn't capture the event
    // that caused the focus trap activation.
    state.delayInitialFocusTimer = config.delayInitialFocus ? delay(function () {
      tryFocus(getInitialFocusNode());
    }) : tryFocus(getInitialFocusNode());
    doc.addEventListener('focusin', checkFocusIn, true);
    doc.addEventListener('mousedown', checkPointerDown, {
      capture: true,
      passive: false
    });
    doc.addEventListener('touchstart', checkPointerDown, {
      capture: true,
      passive: false
    });
    doc.addEventListener('click', checkClick, {
      capture: true,
      passive: false
    });
    doc.addEventListener('keydown', checkKey, {
      capture: true,
      passive: false
    });
    return trap;
  };
  var removeListeners = function removeListeners() {
    if (!state.active) {
      return;
    }
    doc.removeEventListener('focusin', checkFocusIn, true);
    doc.removeEventListener('mousedown', checkPointerDown, true);
    doc.removeEventListener('touchstart', checkPointerDown, true);
    doc.removeEventListener('click', checkClick, true);
    doc.removeEventListener('keydown', checkKey, true);
    return trap;
  };

  //
  // MUTATION OBSERVER
  //

  var checkDomRemoval = function checkDomRemoval(mutations) {
    var isFocusedNodeRemoved = mutations.some(function (mutation) {
      var removedNodes = Array.from(mutation.removedNodes);
      return removedNodes.some(function (node) {
        return node === state.mostRecentlyFocusedNode;
      });
    });

    // If the currently focused is removed then browsers will move focus to the
    // <body> element. If this happens, try to move focus back into the trap.
    if (isFocusedNodeRemoved) {
      tryFocus(getInitialFocusNode());
    }
  };

  // Use MutationObserver - if supported - to detect if focused node is removed
  // from the DOM.
  var mutationObserver = typeof window !== 'undefined' && 'MutationObserver' in window ? new MutationObserver(checkDomRemoval) : undefined;
  var updateObservedNodes = function updateObservedNodes() {
    if (!mutationObserver) {
      return;
    }
    mutationObserver.disconnect();
    if (state.active && !state.paused) {
      state.containers.map(function (container) {
        mutationObserver.observe(container, {
          subtree: true,
          childList: true
        });
      });
    }
  };

  //
  // TRAP DEFINITION
  //

  trap = {
    get active() {
      return state.active;
    },
    get paused() {
      return state.paused;
    },
    activate: function activate(activateOptions) {
      if (state.active) {
        return this;
      }
      var onActivate = getOption(activateOptions, 'onActivate');
      var onPostActivate = getOption(activateOptions, 'onPostActivate');
      var checkCanFocusTrap = getOption(activateOptions, 'checkCanFocusTrap');
      if (!checkCanFocusTrap) {
        updateTabbableNodes();
      }
      state.active = true;
      state.paused = false;
      state.nodeFocusedBeforeActivation = doc.activeElement;
      onActivate === null || onActivate === void 0 ? void 0 : onActivate();
      var finishActivation = function finishActivation() {
        if (checkCanFocusTrap) {
          updateTabbableNodes();
        }
        addListeners();
        updateObservedNodes();
        onPostActivate === null || onPostActivate === void 0 ? void 0 : onPostActivate();
      };
      if (checkCanFocusTrap) {
        checkCanFocusTrap(state.containers.concat()).then(finishActivation, finishActivation);
        return this;
      }
      finishActivation();
      return this;
    },
    deactivate: function deactivate(deactivateOptions) {
      if (!state.active) {
        return this;
      }
      var options = _objectSpread2({
        onDeactivate: config.onDeactivate,
        onPostDeactivate: config.onPostDeactivate,
        checkCanReturnFocus: config.checkCanReturnFocus
      }, deactivateOptions);
      clearTimeout(state.delayInitialFocusTimer); // noop if undefined
      state.delayInitialFocusTimer = undefined;
      removeListeners();
      state.active = false;
      state.paused = false;
      updateObservedNodes();
      activeFocusTraps.deactivateTrap(trapStack, trap);
      var onDeactivate = getOption(options, 'onDeactivate');
      var onPostDeactivate = getOption(options, 'onPostDeactivate');
      var checkCanReturnFocus = getOption(options, 'checkCanReturnFocus');
      var returnFocus = getOption(options, 'returnFocus', 'returnFocusOnDeactivate');
      onDeactivate === null || onDeactivate === void 0 ? void 0 : onDeactivate();
      var finishDeactivation = function finishDeactivation() {
        delay(function () {
          if (returnFocus) {
            tryFocus(getReturnFocusNode(state.nodeFocusedBeforeActivation));
          }
          onPostDeactivate === null || onPostDeactivate === void 0 ? void 0 : onPostDeactivate();
        });
      };
      if (returnFocus && checkCanReturnFocus) {
        checkCanReturnFocus(getReturnFocusNode(state.nodeFocusedBeforeActivation)).then(finishDeactivation, finishDeactivation);
        return this;
      }
      finishDeactivation();
      return this;
    },
    pause: function pause(pauseOptions) {
      if (state.paused || !state.active) {
        return this;
      }
      var onPause = getOption(pauseOptions, 'onPause');
      var onPostPause = getOption(pauseOptions, 'onPostPause');
      state.paused = true;
      onPause === null || onPause === void 0 ? void 0 : onPause();
      removeListeners();
      updateObservedNodes();
      onPostPause === null || onPostPause === void 0 ? void 0 : onPostPause();
      return this;
    },
    unpause: function unpause(unpauseOptions) {
      if (!state.paused || !state.active) {
        return this;
      }
      var onUnpause = getOption(unpauseOptions, 'onUnpause');
      var onPostUnpause = getOption(unpauseOptions, 'onPostUnpause');
      state.paused = false;
      onUnpause === null || onUnpause === void 0 ? void 0 : onUnpause();
      updateTabbableNodes();
      addListeners();
      updateObservedNodes();
      onPostUnpause === null || onPostUnpause === void 0 ? void 0 : onPostUnpause();
      return this;
    },
    updateContainerElements: function updateContainerElements(containerElements) {
      var elementsAsArray = [].concat(containerElements).filter(Boolean);
      state.containers = elementsAsArray.map(function (element) {
        return typeof element === 'string' ? doc.querySelector(element) : element;
      });
      if (state.active) {
        updateTabbableNodes();
      }
      updateObservedNodes();
      return this;
    }
  };

  // initialize container elements
  trap.updateContainerElements(elements);
  return trap;
};

exports.createFocusTrap = createFocusTrap;
//# sourceMappingURL=focus-trap.js.map