MutationObserver.prototype.createMutationSearcher = function()

in packages/eui/scripts/jest/polyfills/mutation_observer.js [237:270]

• 24 lines of code
• 10 McCabe index (conditional complexity)

  MutationObserver.prototype.createMutationSearcher = function ($target, config) {
    var _this = this;
    /** type {Elestuct} */
    var $oldstate = Util.clone($target, config); // create the cloned datastructure
    /**
     * consumes array of mutations we can push to
     *
     * @param {Array.<MutationRecord>} mutations
     */
    return function (mutations) {
      var olen = mutations.length;
      var dirty;
      if (config.charData && $target.nodeType === 3 && $target.nodeValue !== $oldstate.charData) {
        mutations.push(new MutationRecord({
          type: 'characterData',
          target: $target,
          oldValue: $oldstate.charData
        }));
      }
      // Alright we check base level changes in attributes... easy
      if (config.attr && $oldstate.attr) {
        _this.findAttributeMutations(mutations, $target, $oldstate.attr, config.afilter);
      }
      // check childlist or subtree for mutations
      if (config.kids || config.descendents) {
        dirty = _this.searchSubtree(mutations, $target, $oldstate, config);
      }
      // reclone data structure if theres changes
      if (dirty || mutations.length !== olen) {
        /** type {Elestuct} */
        $oldstate = Util.clone($target, config);
      }
    };
  };