Excerpt of minified dart2js output with duplicate JS parameters

main.dart.js

    function MenuNavbarComponent(_menu_navbar$_renderedToolbarModelIds, _$MenuNavbarComponentImplMixin_$defaultConsumedProps, RenderPerformance__endMetric, RenderPerformance_performanceLabel, BatchedRedraws_shouldBatchRedraw, _FluxComponentMixin__subscriptions, _typedPropsCache, _props, _react$_state, _ref, _jsRedraw, _jsThis, _setStateCallbacks, _transactionalSetStateCallbacks, _prevState, _nextState, nextProps, $ti) {
      this._menu_navbar$_renderedToolbarModelIds = _menu_navbar$_renderedToolbarModelIds;
      this._$MenuNavbarComponentImplMixin_$defaultConsumedProps = _$MenuNavbarComponentImplMixin_$defaultConsumedProps;
      this.RenderPerformance__endMetric = RenderPerformance__endMetric;
      this.RenderPerformance_performanceLabel = RenderPerformance_performanceLabel;
      this.BatchedRedraws_shouldBatchRedraw = BatchedRedraws_shouldBatchRedraw;
      this._FluxComponentMixin__subscriptions = _FluxComponentMixin__subscriptions;
      this._typedPropsCache = _typedPropsCache;
      this._props = _props;
      this._react$_state = _react$_state;
      this._ref = _ref;
      this._jsRedraw = _jsRedraw;
      this._jsThis = _jsThis;
      this._setStateCallbacks = _setStateCallbacks;
      this._transactionalSetStateCallbacks = _transactionalSetStateCallbacks;
      this._prevState = _prevState;
      this._nextState = _nextState;
      this.nextProps = nextProps;
      this.$ti = $ti;
      this.$deferredAction();
    }
    MenuNavbarComponent.builtin$cls = "MenuNavbarComponent";
    if (!("name" in MenuNavbarComponent))
      MenuNavbarComponent.name = "MenuNavbarComponent";
    $desc = $collectedClasses$.MenuNavbarComponent[1];
    MenuNavbarComponent.prototype = $desc;
    MenuNavbarComponent.$__fields__ = ["_menu_navbar$_renderedToolbarModelIds", "_$MenuNavbarComponentImplMixin_$defaultConsumedProps", "RenderPerformance__endMetric", "RenderPerformance_performanceLabel", "BatchedRedraws_shouldBatchRedraw", "_FluxComponentMixin__subscriptions", "_typedPropsCache", "_props", "_react$_state", "_ref", "_jsRedraw", "_jsThis", "_setStateCallbacks", "_transactionalSetStateCallbacks", "_prevState", "_nextState", "nextProps"];
    function FluxUiComponent_RenderPerformance2($ti) {
      this.$ti = $ti;
      this.$deferredAction();
    }
    FluxUiComponent_RenderPerformance2.builtin$cls = "FluxUiComponent_RenderPerformance2";
    if (!("name" in FluxUiComponent_RenderPerformance2))
      FluxUiComponent_RenderPerformance2.name = "FluxUiComponent_RenderPerformance2";
    $desc = $collectedClasses$.FluxUiComponent_RenderPerformance2[1];
    FluxUiComponent_RenderPerformance2.prototype = $desc;
    FluxUiComponent_RenderPerformance2.$__fields__ = [];
    function FluxUiComponent_RenderPerformance__$MenuNavbarComponentImplMixin(_$MenuNavbarComponentImplMixin_$defaultConsumedProps, $ti) {
      this._$MenuNavbarComponentImplMixin_$defaultConsumedProps = _$MenuNavbarComponentImplMixin_$defaultConsumedProps;
      this.$ti = $ti;
      this.$deferredAction();
    }
    FluxUiComponent_RenderPerformance__$MenuNavbarComponentImplMixin.builtin$cls = "FluxUiComponent_RenderPerformance__$MenuNavbarComponentImplMixin";
    if (!("name" in FluxUiComponent_RenderPerformance__$MenuNavbarComponentImplMixin))
      FluxUiComponent_RenderPerformance__$MenuNavbarComponentImplMixin.name = "FluxUiComponent_RenderPerformance__$MenuNavbarComponentImplMixin";
    $desc = $collectedClasses$.FluxUiComponent_RenderPerformance__$MenuNavbarComponentImplMixin[1];
    FluxUiComponent_RenderPerformance__$MenuNavbarComponentImplMixin.prototype = $desc;
    FluxUiComponent_RenderPerformance__$MenuNavbarComponentImplMixin.$__fields__ = ["_$MenuNavbarComponentImplMixin_$defaultConsumedProps"];
    _$MenuNavbarComponentImplMixin.prototype.get$$$defaultConsumedProps = function() {
      return this._$MenuNavbarComponentImplMixin_$defaultConsumedProps;
    };
    function MenuNavbarComponent_componentDidUpdate_closure() {
      this.$deferredAction();
    }
    MenuNavbarComponent_componentDidUpdate_closure.builtin$cls = "MenuNavbarComponent_componentDidUpdate_closure";
    if (!("name" in MenuNavbarComponent_componentDidUpdate_closure))
      MenuNavbarComponent_componentDidUpdate_closure.name = "MenuNavbarComponent_componentDidUpdate_closure";
    $desc = $collectedClasses$.MenuNavbarComponent_componentDidUpdate_closure[1];
    MenuNavbarComponent_componentDidUpdate_closure.prototype = $desc;
    MenuNavbarComponent_componentDidUpdate_closure.$__fields__ = [];
    function MenuNavbarComponent_render_closure($this) {
      this.$this = $this;
      this.$deferredAction();
    }
    MenuNavbarComponent_render_closure.builtin$cls = "MenuNavbarComponent_render_closure";
    if (!("name" in MenuNavbarComponent_render_closure))
      MenuNavbarComponent_render_closure.name = "MenuNavbarComponent_render_closure";
    $desc = $collectedClasses$.MenuNavbarComponent_render_closure[1];
    MenuNavbarComponent_render_closure.prototype = $desc;
    MenuNavbarComponent_render_closure.$__fields__ = ["$this"];
    function MenuNavbarComponent_render__closure(model) {
      this.model = model;
      this.$deferredAction();
    }
    MenuNavbarComponent_render__closure.builtin$cls = "MenuNavbarComponent_render__closure";
    if (!("name" in MenuNavbarComponent_render__closure))
      MenuNavbarComponent_render__closure.name = "MenuNavbarComponent_render__closure";
    $desc = $collectedClasses$.MenuNavbarComponent_render__closure[1];
    MenuNavbarComponent_render__closure.prototype = $desc;
    MenuNavbarComponent_render__closure.$__fields__ = ["model"];
    function closure23() {
      this.$deferredAction();
    }
    closure23.builtin$cls = "closure23";
    if (!("name" in closure23))
      closure23.name = "closure23";
    $desc = $collectedClasses$.closure23[1];
    closure23.prototype = $desc;
    closure23.$__fields__ = [];
    function _$MenuNavbarPropsImpl(props) {
      this.props = props;
      this.$deferredAction();
    }
    _$MenuNavbarPropsImpl.builtin$cls = "_$MenuNavbarPropsImpl";
    if (!("name" in _$MenuNavbarPropsImpl))
      _$MenuNavbarPropsImpl.name = "_$MenuNavbarPropsImpl";
    $desc = $collectedClasses$._$MenuNavbarPropsImpl[1];
    _$MenuNavbarPropsImpl.prototype = $desc;
    _$MenuNavbarPropsImpl.$__fields__ = ["props"];
    _$MenuNavbarPropsImpl.prototype.get$props = function(receiver) {
      return this.props;
    };
    function _$MenuNavbarComponentImplMixin(_$MenuNavbarComponentImplMixin_$defaultConsumedProps) {
      this._$MenuNavbarComponentImplMixin_$defaultConsumedProps = _$MenuNavbarComponentImplMixin_$defaultConsumedProps;
      this.$deferredAction();
    }
    _$MenuNavbarComponentImplMixin.builtin$cls = "_$MenuNavbarComponentImplMixin";
    if (!("name" in _$MenuNavbarComponentImplMixin))
      _$MenuNavbarComponentImplMixin.name = "_$MenuNavbarComponentImplMixin";
    $desc = $collectedClasses$._$MenuNavbarComponentImplMixin[1];
    _$MenuNavbarComponentImplMixin.prototype = $desc;
    _$MenuNavbarComponentImplMixin.$__fields__ = ["_$MenuNavbarComponentImplMixin_$defaultConsumedProps"];
    _$MenuNavbarComponentImplMixin.prototype.get$$$defaultConsumedProps = function() {
      return this._$MenuNavbarComponentImplMixin_$defaultConsumedProps;
    };
    function closure1029() {
      this.$deferredAction();
    }
    closure1029.builtin$cls = "closure1029";
    if (!("name" in closure1029))
      closure1029.name = "closure1029";
    $desc = $collectedClasses$.closure1029[1];
    closure1029.prototype = $desc;
    closure1029.$__fields__ = [];