{"dependencies":[{"name":"@babel/runtime/helpers/interopRequireDefault","data":{"asyncType":null,"isESMImport":false,"locs":[],"key":"kslwqCIsh6ew+I1KeA1rlVRjsAk=","exportNames":["*"]}},{"name":"@babel/runtime/helpers/slicedToArray","data":{"asyncType":null,"isESMImport":false,"locs":[],"key":"5y7e5+zC7teYEEC6niD9f5zII1M=","exportNames":["*"]}},{"name":"@babel/runtime/helpers/classCallCheck","data":{"asyncType":null,"isESMImport":false,"locs":[],"key":"yg7e6laZwmpbIvId5jovq9ugXp8=","exportNames":["*"]}},{"name":"@babel/runtime/helpers/createClass","data":{"asyncType":null,"isESMImport":false,"locs":[],"key":"Z6pzkVZ2fvxBLkFTgVVOy4UDj30=","exportNames":["*"]}},{"name":"./ListMetricsAggregator","data":{"asyncType":null,"isESMImport":true,"locs":[{"start":{"line":15,"column":0},"end":{"line":15,"column":60}}],"key":"+LsZXRWRdDHi7URH4twavK8owRs=","exportNames":["*"]}},{"name":"invariant","data":{"asyncType":null,"isESMImport":false,"locs":[{"start":{"line":17,"column":18},"end":{"line":17,"column":38}}],"key":"oQpL0Es3H146KnQH9ygFeHrzVP4=","exportNames":["*"]}}],"output":[{"data":{"code":"__d(function (global, require, _$$_IMPORT_DEFAULT, _$$_IMPORT_ALL, module, exports, _dependencyMap) {\n  'use strict';\n\n  var _interopRequireDefault = require(_dependencyMap[0], \"@babel/runtime/helpers/interopRequireDefault\");\n  Object.defineProperty(exports, \"__esModule\", {\n    value: true\n  });\n  exports.default = void 0;\n  var _slicedToArray2 = _interopRequireDefault(require(_dependencyMap[1], \"@babel/runtime/helpers/slicedToArray\"));\n  var _classCallCheck2 = _interopRequireDefault(require(_dependencyMap[2], \"@babel/runtime/helpers/classCallCheck\"));\n  var _createClass2 = _interopRequireDefault(require(_dependencyMap[3], \"@babel/runtime/helpers/createClass\"));\n  var _ListMetricsAggregator = _interopRequireDefault(require(_dependencyMap[4], \"./ListMetricsAggregator\"));\n  var invariant = require(_dependencyMap[5], \"invariant\");\n  var ViewabilityHelper = /*#__PURE__*/function () {\n    function ViewabilityHelper() {\n      var config = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {\n        viewAreaCoveragePercentThreshold: 0\n      };\n      (0, _classCallCheck2.default)(this, ViewabilityHelper);\n      this._hasInteracted = false;\n      this._timers = new Set();\n      this._viewableIndices = [];\n      this._viewableItems = new Map();\n      this._config = config;\n    }\n    return (0, _createClass2.default)(ViewabilityHelper, [{\n      key: \"dispose\",\n      value: function dispose() {\n        this._timers.forEach(clearTimeout);\n      }\n    }, {\n      key: \"computeViewableItems\",\n      value: function computeViewableItems(props, scrollOffset, viewportHeight, listMetrics, renderRange) {\n        var itemCount = props.getItemCount(props.data);\n        var _this$_config = this._config,\n          itemVisiblePercentThreshold = _this$_config.itemVisiblePercentThreshold,\n          viewAreaCoveragePercentThreshold = _this$_config.viewAreaCoveragePercentThreshold;\n        var viewAreaMode = viewAreaCoveragePercentThreshold != null;\n        var viewablePercentThreshold = viewAreaMode ? viewAreaCoveragePercentThreshold : itemVisiblePercentThreshold;\n        invariant(viewablePercentThreshold != null && itemVisiblePercentThreshold != null !== (viewAreaCoveragePercentThreshold != null), 'Must set exactly one of itemVisiblePercentThreshold or viewAreaCoveragePercentThreshold');\n        var viewableIndices = [];\n        if (itemCount === 0) {\n          return viewableIndices;\n        }\n        var firstVisible = -1;\n        var _ref = renderRange || {\n            first: 0,\n            last: itemCount - 1\n          },\n          first = _ref.first,\n          last = _ref.last;\n        if (last >= itemCount) {\n          console.warn('Invalid render range computing viewability ' + JSON.stringify({\n            renderRange,\n            itemCount\n          }));\n          return [];\n        }\n        for (var idx = first; idx <= last; idx++) {\n          var metrics = listMetrics.getCellMetrics(idx, props);\n          if (!metrics) {\n            continue;\n          }\n          var top = Math.floor(metrics.offset - scrollOffset);\n          var bottom = Math.floor(top + metrics.length);\n          if (top < viewportHeight && bottom > 0) {\n            firstVisible = idx;\n            if (_isViewable(viewAreaMode, viewablePercentThreshold, top, bottom, viewportHeight, metrics.length)) {\n              viewableIndices.push(idx);\n            }\n          } else if (firstVisible >= 0) {\n            break;\n          }\n        }\n        return viewableIndices;\n      }\n    }, {\n      key: \"onUpdate\",\n      value: function onUpdate(props, scrollOffset, viewportHeight, listMetrics, createViewToken, onViewableItemsChanged, renderRange) {\n        var itemCount = props.getItemCount(props.data);\n        if (this._config.waitForInteraction && !this._hasInteracted || itemCount === 0 || !listMetrics.getCellMetrics(0, props)) {\n          return;\n        }\n        var viewableIndices = [];\n        if (itemCount) {\n          viewableIndices = this.computeViewableItems(props, scrollOffset, viewportHeight, listMetrics, renderRange);\n        }\n        if (this._viewableIndices.length === viewableIndices.length && this._viewableIndices.every((v, ii) => v === viewableIndices[ii])) {\n          return;\n        }\n        this._viewableIndices = viewableIndices;\n        if (this._config.minimumViewTime) {\n          var handle = setTimeout(() => {\n            this._timers.delete(handle);\n            this._onUpdateSync(props, viewableIndices, onViewableItemsChanged, createViewToken);\n          }, this._config.minimumViewTime);\n          this._timers.add(handle);\n        } else {\n          this._onUpdateSync(props, viewableIndices, onViewableItemsChanged, createViewToken);\n        }\n      }\n    }, {\n      key: \"resetViewableIndices\",\n      value: function resetViewableIndices() {\n        this._viewableIndices = [];\n      }\n    }, {\n      key: \"recordInteraction\",\n      value: function recordInteraction() {\n        this._hasInteracted = true;\n      }\n    }, {\n      key: \"_onUpdateSync\",\n      value: function _onUpdateSync(props, viewableIndicesToCheck, onViewableItemsChanged, createViewToken) {\n        viewableIndicesToCheck = viewableIndicesToCheck.filter(ii => this._viewableIndices.includes(ii));\n        var prevItems = this._viewableItems;\n        var nextItems = new Map(viewableIndicesToCheck.map(ii => {\n          var viewable = createViewToken(ii, true, props);\n          return [viewable.key, viewable];\n        }));\n        var changed = [];\n        for (var _ref2 of nextItems) {\n          var _ref3 = (0, _slicedToArray2.default)(_ref2, 2);\n          var key = _ref3[0];\n          var viewable = _ref3[1];\n          if (!prevItems.has(key)) {\n            changed.push(viewable);\n          }\n        }\n        for (var _ref4 of prevItems) {\n          var _ref5 = (0, _slicedToArray2.default)(_ref4, 2);\n          var _key = _ref5[0];\n          var _viewable = _ref5[1];\n          if (!nextItems.has(_key)) {\n            changed.push({\n              ..._viewable,\n              isViewable: false\n            });\n          }\n        }\n        if (changed.length > 0) {\n          this._viewableItems = nextItems;\n          onViewableItemsChanged({\n            viewableItems: Array.from(nextItems.values()),\n            changed,\n            viewabilityConfig: this._config\n          });\n        }\n      }\n    }]);\n  }();\n  function _isViewable(viewAreaMode, viewablePercentThreshold, top, bottom, viewportHeight, itemLength) {\n    if (_isEntirelyVisible(top, bottom, viewportHeight)) {\n      return true;\n    } else {\n      var pixels = _getPixelsVisible(top, bottom, viewportHeight);\n      var percent = 100 * (viewAreaMode ? pixels / viewportHeight : pixels / itemLength);\n      return percent >= viewablePercentThreshold;\n    }\n  }\n  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