text: /**
   * @license
   * Copyright Google LLC All Rights Reserved.
   *
   * Use of this source code is governed by an MIT-style license that can be
   * found in the LICENSE file at https://angular.io/license
   */
  (function (global, factory) {
  	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('@angular/animations'), require('@angular/cdk/a11y'), require('@angular/cdk/bidi'), require('@angular/cdk/coercion'), require('@angular/cdk/collections'), require('@angular/cdk/keycodes'), require('@angular/cdk/overlay'), require('@angular/cdk/scrolling'), require('@angular/core'), require('@angular/forms'), require('@angular/material/core'), require('@angular/material/form-field'), require('rxjs'), require('rxjs/operators'), require('@angular/common')) :
  	typeof define === 'function' && define.amd ? define('@angular/material/select', ['exports', '@angular/animations', '@angular/cdk/a11y', '@angular/cdk/bidi', '@angular/cdk/coercion', '@angular/cdk/collections', '@angular/cdk/keycodes', '@angular/cdk/overlay', '@angular/cdk/scrolling', '@angular/core', '@angular/forms', '@angular/material/core', '@angular/material/form-field', 'rxjs', 'rxjs/operators', '@angular/common'], factory) :
  	(factory((global.ng = global.ng || {}, global.ng.material = global.ng.material || {}, global.ng.material.select = {}),global.ng.animations,global.ng.cdk.a11y,global.ng.cdk.bidi,global.ng.cdk.coercion,global.ng.cdk.collections,global.ng.cdk.keycodes,global.ng.cdk.overlay,global.ng.cdk.scrolling,global.ng.core,global.ng.forms,global.ng.material.core,global.ng.material.formField,global.rxjs,global.rxjs.operators,global.ng.common));
  }(this, (function (exports,animations,a11y,bidi,coercion,collections,keycodes,overlay,scrolling,core,forms,core$1,formField,rxjs,operators,common) { 'use strict';
  
  /*! *****************************************************************************
  Copyright (c) Microsoft Corporation. All rights reserved.
  Licensed under the Apache License, Version 2.0 (the "License"); you may not use
  this file except in compliance with the License. You may obtain a copy of the
  License at http://www.apache.org/licenses/LICENSE-2.0
  
  THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
  WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
  MERCHANTABLITY OR NON-INFRINGEMENT.
  
  See the Apache Version 2.0 License for specific language governing permissions
  and limitations under the License.
  ***************************************************************************** */
  /* global Reflect, Promise */
  
  var extendStatics = function(d, b) {
      extendStatics = Object.setPrototypeOf ||
          ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
          function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
      return extendStatics(d, b);
  };
  
  function __extends(d, b) {
      extendStatics(d, b);
      function __() { this.constructor = d; }
      d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
  }
  
  /**
   * @fileoverview added by tsickle
   * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
   */
  /**
   * The following are all the animations for the mat-select component, with each
   * const containing the metadata for one animation.
   *
   * The values below match the implementation of the AngularJS Material mat-select animation.
   * \@docs-private
   * @type {?}
   */
  var matSelectAnimations = {
      /**
       * This animation ensures the select's overlay panel animation (transformPanel) is called when
       * closing the select.
       * This is needed due to https://github.com/angular/angular/issues/23302
       */
      transformPanelWrap: animations.trigger('transformPanelWrap', [
          animations.transition('* => void', animations.query('@transformPanel', [animations.animateChild()], { optional: true }))
      ]),
      /**
       * This animation transforms the select's overlay panel on and off the page.
       *
       * When the panel is attached to the DOM, it expands its width by the amount of padding, scales it
       * up to 100% on the Y axis, fades in its border, and translates slightly up and to the
       * side to ensure the option text correctly overlaps the trigger text.
       *
       * When the panel is removed from the DOM, it simply fades out linearly.
       */
      transformPanel: animations.trigger('transformPanel', [
          animations.state('void', animations.style({
              transform: 'scaleY(0.8)',
              minWidth: '100%',
              opacity: 0
          })),
          animations.state('showing', animations.style({
              opacity: 1,
              minWidth: 'calc(100% + 32px)',
              // 32px = 2 * 16px padding
              transform: 'scaleY(1)'
          })),
          animations.state('showing-multiple', animations.style({
              opacity: 1,
              minWidth: 'calc(100% + 64px)',
              // 64px = 48px padding on the left + 16px padding on the right
              transform: 'scaleY(1)'
          })),
          animations.transition('void => *', animations.animate('120ms cubic-bezier(0, 0, 0.2, 1)')),
          animations.transition('* => void', animations.animate('100ms 25ms linear', animations.style({ opacity: 0 })))
      ]),
      /**
       * This animation fades in the background color and text content of the
       * select's options. It is time delayed to occur 100ms after the overlay
       * panel has transformed in.
       * @deprecated Not used anymore. To be removed.
       * \@breaking-change 8.0.0
       */
      fadeInContent: animations.trigger('fadeInContent', [
          animations.state('showing', animations.style({ opacity: 1 })),
          animations.transition('void => showing', [
              animations.style({ opacity: 0 }),
              animations.animate('150ms 100ms cubic-bezier(0.55, 0, 0.55, 0.2)')
          ])
      ])
  };
  /**
   * @deprecated
   * \@breaking-change 8.0.0
   * \@docs-private
   * @type {?}
   */
  var transformPanel = matSelectAnimations.transformPanel;
  /**
   * @deprecated
   * \@breaking-change 8.0.0
   * \@docs-private
   * @type {?}
   */
  var fadeInContent = matSelectAnimations.fadeInContent;
  
  /**
   * @fileoverview added by tsickle
   * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
   */
  
  /**
   * Returns an exception to be thrown when attempting to change a select's `multiple` option
   * after initialization.
   * \@docs-private
   * @return {?}
   */
  function getMatSelectDynamicMultipleError() {
      return Error('Cannot change `multiple` mode of select after initialization.');
  }
  /**
   * Returns an exception to be thrown when attempting to assign a non-array value to a select
   * in `multiple` mode. Note that `undefined` and `null` are still valid values to allow for
   * resetting the value.
   * \@docs-private
   * @return {?}
   */
  function getMatSelectNonArrayValueError() {
      return Error('Value must be an array in multiple-selection mode.');
  }
  /**
   * Returns an exception to be thrown when assigning a non-function value to the comparator
   * used to determine if a value corresponds to an option. Note that whether the function
   * actually takes two values and returns a boolean is not checked.
   * @return {?}
   */
  function getMatSelectNonFunctionValueError() {
      return Error('`compareWith` must be a function.');
  }
  
  /**
   * @fileoverview added by tsickle
   * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
   */
  /** @type {?} */
  var nextUniqueId = 0;
  /**
   * The max height of the select's overlay panel
   * @type {?}
   */
  var SELECT_PANEL_MAX_HEIGHT = 256;
  /**
   * The panel's padding on the x-axis
   * @type {?}
   */
  var SELECT_PANEL_PADDING_X = 16;
  /**
   * The panel's x axis padding if it is indented (e.g. there is an option group).
   * @type {?}
   */
  var SELECT_PANEL_INDENT_PADDING_X = SELECT_PANEL_PADDING_X * 2;
  /**
   * The height of the select items in `em` units.
   * @type {?}
   */
  var SELECT_ITEM_HEIGHT_EM = 3;
  // TODO(josephperrott): Revert to a constant after 2018 spec updates are fully merged.
  /**
   * Distance between the panel edge and the option text in
   * multi-selection mode.
   *
   * Calculated as:
   * (SELECT_PANEL_PADDING_X * 1.5) + 16 = 40
   * The padding is multiplied by 1.5 because the checkbox's margin is half the padding.
   * The checkbox width is 16px.
   * @type {?}
   */
  var SELECT_MULTIPLE_PANEL_PADDING_X = SELECT_PANEL_PADDING_X * 1.5 + 16;
  /**
   * The select panel will only "fit" inside the viewport if it is positioned at
   * this value or more away from the viewport boundary.
   * @type {?}
   */
  var SELECT_PANEL_VIEWPORT_PADDING = 8;
  /**
   * Injection token that determines the scroll handling while a select is open.
   * @type {?}
   */
  var MAT_SELECT_SCROLL_STRATEGY = new core.InjectionToken('mat-select-scroll-strategy');
  /**
   * \@docs-private
   * @param {?} overlay
   * @return {?}
   */
  function MAT_SELECT_SCROLL_STRATEGY_PROVIDER_FACTORY(overlay$$1) {
      return (/**
       * @return {?}
       */
      function () { return overlay$$1.scrollStrategies.reposition(); });
  }
  /**
   * \@docs-private
   * @type {?}
   */
  var MAT_SELECT_SCROLL_STRATEGY_PROVIDER = {
      provide: MAT_SELECT_SCROLL_STRATEGY,
      deps: [overlay.Overlay],
      useFactory: MAT_SELECT_SCROLL_STRATEGY_PROVIDER_FACTORY,
  };
  /**
   * Change event object that is emitted when the select value has changed.
   */
  var   /**
   * Change event object that is emitted when the select value has changed.
   */
  MatSelectChange = /** @class */ (function () {
      function MatSelectChange(source, value) {
          this.source = source;
          this.value = value;
      }
      return MatSelectChange;
  }());
  // Boilerplate for applying mixins to MatSelect.
  /**
   * \@docs-private
   */
  var 
  // Boilerplate for applying mixins to MatSelect.
  /**
   * \@docs-private
   */
  MatSelectBase = /** @class */ (function () {
      function MatSelectBase(_elementRef, _defaultErrorStateMatcher, _parentForm, _parentFormGroup, ngControl) {
          this._elementRef = _elementRef;
          this._defaultErrorStateMatcher = _defaultErrorStateMatcher;
          this._parentForm = _parentForm;
          this._parentFormGroup = _parentFormGroup;
          this.ngControl = ngControl;
      }
      return MatSelectBase;
  }());
  /** @type {?} */
  var _MatSelectMixinBase = core$1.mixinDisableRipple(core$1.mixinTabIndex(core$1.mixinDisabled(core$1.mixinErrorState(MatSelectBase))));
  /**
   * Allows the user to customize the trigger that is displayed when the select has a value.
   */
  var MatSelectTrigger = /** @class */ (function () {
      function MatSelectTrigger() {
      }
      MatSelectTrigger.decorators = [
          { type: core.Directive, args: [{
                      selector: 'mat-select-trigger'
                  },] },
      ];
      return MatSelectTrigger;
  }());
  var MatSelect = /** @class */ (function (_super) {
      __extends(MatSelect, _super);
      function MatSelect(_viewportRuler, _changeDetectorRef, _ngZone, _defaultErrorStateMatcher, elementRef, _dir, _parentForm, _parentFormGroup, _parentFormField, ngControl, tabIndex, scrollStrategyFactory, _liveAnnouncer) {
          var _this = _super.call(this, elementRef, _defaultErrorStateMatcher, _parentForm, _parentFormGroup, ngControl) || this;
          _this._viewportRuler = _viewportRuler;
          _this._changeDetectorRef = _changeDetectorRef;
          _this._ngZone = _ngZone;
          _this._dir = _dir;
          _this._parentFormField = _parentFormField;
          _this.ngControl = ngControl;
          _this._liveAnnouncer = _liveAnnouncer;
          /**
           * Whether or not the overlay panel is open.
           */
          _this._panelOpen = false;
          /**
           * Whether filling out the select is required in the form.
           */
          _this._required = false;
          /**
           * The scroll position of the overlay panel, calculated to center the selected option.
           */
          _this._scrollTop = 0;
          /**
           * Whether the component is in multiple selection mode.
           */
          _this._multiple = false;
          /**
           * Comparison function to specify which option is displayed. Defaults to object equality.
           */
          _this._compareWith = (/**
           * @param {?} o1
           * @param {?} o2
           * @return {?}
           */
          function (o1, o2) { return o1 === o2; });
          /**
           * Unique id for this input.
           */
          _this._uid = "mat-select-" + nextUniqueId++;
          /**
           * Emits whenever the component is destroyed.
           */
          _this._destroy = new rxjs.Subject();
          /**
           * The cached font-size of the trigger element.
           */
          _this._triggerFontSize = 0;
          /**
           * `View -> model callback called when value changes`
           */
          _this._onChange = (/**
           * @return {?}
           */
          function () { });
          /**
           * `View -> model callback called when select has been touched`
           */
          _this._onTouched = (/**
           * @return {?}
           */
          function () { });
          /**
           * The IDs of child options to be passed to the aria-owns attribute.
           */
          _this._optionIds = '';
          /**
           * The value of the select panel's transform-origin property.
           */
          _this._transformOrigin = 'top';
          /**
           * Emits when the panel element is finished transforming in.
           */
          _this._panelDoneAnimatingStream = new rxjs.Subject();
          /**
           * The y-offset of the overlay panel in relation to the trigger's top start corner.
           * This must be adjusted to align the selected option text over the trigger text.
           * when the panel opens. Will change based on the y-position of the selected option.
           */
          _this._offsetY = 0;
          /**
           * This position config ensures that the top "start" corner of the overlay
           * is aligned with with the top "start" of the origin by default (overlapping
           * the trigger completely). If the panel cannot fit below the trigger, it
           * will fall back to a position above the trigger.
           */
          _this._positions = [
              {
                  originX: 'start',
                  originY: 'top',
                  overlayX: 'start',
                  overlayY: 'top',
              },
              {
                  originX: 'start',
                  originY: 'bottom',
                  overlayX: 'start',
                  overlayY: 'bottom',
              },
          ];
          /**
           * Whether the component is disabling centering of the active option over the trigger.
           */
          _this._disableOptionCentering = false;
          _this._focused = false;
          /**
           * A name for this control that can be used by `mat-form-field`.
           */
          _this.controlType = 'mat-select';
          /**
           * Aria label of the select. If not specified, the placeholder will be used as label.
           */
          _this.ariaLabel = '';
          /**
           * Combined stream of all of the child options' change events.
           */
          _this.optionSelectionChanges = (/** @type {?} */ (rxjs.defer((/**
           * @return {?}
           */
          function () {
              /** @type {?} */
              var options = _this.options;
              if (options) {
                  return options.changes.pipe(operators.startWith(options), operators.switchMap((/**
                   * @return {?}
                   */
                  function () { return rxjs.merge.apply(void 0, options.map((/**
                   * @param {?} option
                   * @return {?}
                   */
                  function (option) { return option.onSelectionChange; }))); })));
              }
              return _this._ngZone.onStable
                  .asObservable()
                  .pipe(operators.take(1), operators.switchMap((/**
               * @return {?}
               */
              function () { return _this.optionSelectionChanges; })));
          }))));
          /**
           * Event emitted when the select panel has been toggled.
           */
          _this.openedChange = new core.EventEmitter();
          /**
           * Event emitted when the select has been opened.
           */
          _this._openedStream = _this.openedChange.pipe(operators.filter((/**
           * @param {?} o
           * @return {?}
           */
          function (o) { return o; })), operators.map((/**
           * @return {?}
           */
          function () { })));
          /**
           * Event emitted when the select has been closed.
           */
          _this._closedStream = _this.openedChange.pipe(operators.filter((/**
           * @param {?} o
           * @return {?}
           */
          function (o) { return !o; })), operators.map((/**
           * @return {?}
           */
          function () { })));
          /**
           * Event emitted when the selected value has been changed by the user.
           */
          _this.selectionChange = new core.EventEmitter();
          /**
           * Event that emits whenever the raw value of the select changes. This is here primarily
           * to facilitate the two-way binding for the `value` input.
           * \@docs-private
           */
          _this.valueChange = new core.EventEmitter();
          if (_this.ngControl) {
              // Note: we provide the value accessor through here, instead of
              // the `providers` to avoid running into a circular import.
              _this.ngControl.valueAccessor = _this;
          }
          _this._scrollStrategyFactory = scrollStrategyFactory;
          _this._scrollStrategy = _this._scrollStrategyFactory();
          _this.tabIndex = parseInt(tabIndex) || 0;
          // Force setter to be called in case id was not specified.
          _this.id = _this.id;
          return _this;
      }
      Object.defineProperty(MatSelect.prototype, "focused", {
          /** Whether the select is focused. */
          get: /**
           * Whether the select is focused.
           * @return {?}
           */
          function () {
              return this._focused || this._panelOpen;
          },
          /**
           * @deprecated Setter to be removed as this property is intended to be readonly.
           * @breaking-change 8.0.0
           */
          set: /**
           * @deprecated Setter to be removed as this property is intended to be readonly.
           * \@breaking-change 8.0.0
           * @param {?} value
           * @return {?}
           */
          function (value) {
              this._focused = value;
          },
          enumerable: true,
          configurable: true
      });
      Object.defineProperty(MatSelect.prototype, "placeholder", {
          /** Placeholder to be shown if no value has been selected. */
          get: /**
           * Placeholder to be shown if no value has been selected.
           * @return {?}
           */
          function () { return this._placeholder; },
          set: /**
           * @param {?} value
           * @return {?}
           */
          function (value) {
              this._placeholder = value;
              this.stateChanges.next();
          },
          enumerable: true,
          configurable: true
      });
      Object.defineProperty(MatSelect.prototype, "required", {
          /** Whether the component is required. */
          get: /**
           * Whether the component is required.
           * @return {?}
           */
          function () { return this._required; },
          set: /**
           * @param {?} value
           * @return {?}
           */
          function (value) {
              this._required = coercion.coerceBooleanProperty(value);
              this.stateChanges.next();
          },
          enumerable: true,
          configurable: true
      });
      Object.defineProperty(MatSelect.prototype, "multiple", {
          /** Whether the user should be allowed to select multiple options. */
          get: /**
           * Whether the user should be allowed to select multiple options.
           * @return {?}
           */
          function () { return this._multiple; },
          set: /**
           * @param {?} value
           * @return {?}
           */
          function (value) {
              if (this._selectionModel) {
                  throw getMatSelectDynamicMultipleError();
              }
              this._multiple = coercion.coerceBooleanProperty(value);
          },
          enumerable: true,
          configurable: true
      });
      Object.defineProperty(MatSelect.prototype, "disableOptionCentering", {
          /** Whether to center the active option over the trigger. */
          get: /**
           * Whether to center the active option over the trigger.
           * @return {?}
           */
          function () { return this._disableOptionCentering; },
          set: /**
           * @param {?} value
           * @return {?}
           */
          function (value) {
              this._disableOptionCentering = coercion.coerceBooleanProperty(value);
          },
          enumerable: true,
          configurable: true
      });
      Object.defineProperty(MatSelect.prototype, "compareWith", {
          /**
           * Function to compare the option values with the selected values. The first argument
           * is a value from an option. The second is a value from the selection. A boolean
           * should be returned.
           */
          get: /**
           * Function to compare the option values with the selected values. The first argument
           * is a value from an option. The second is a value from the selection. A boolean
           * should be returned.
           * @return {?}
           */
          function () { return this._compareWith; },
          set: /**
           * @param {?} fn
           * @return {?}
           */
          function (fn) {
              if (typeof fn !== 'function') {
                  throw getMatSelectNonFunctionValueError();
              }
              this._compareWith = fn;
              if (this._selectionModel) {
                  // A different comparator means the selection could change.
                  this._initializeSelection();
              }
          },
          enumerable: true,
          configurable: true
      });
      Object.defineProperty(MatSelect.prototype, "value", {
          /** Value of the select control. */
          get: /**
           * Value of the select control.
           * @return {?}
           */
          function () { return this._value; },
          set: /**
           * @param {?} newValue
           * @return {?}
           */
          function (newValue) {
              if (newValue !== this._value) {
                  this.writeValue(newValue);
                  this._value = newValue;
              }
          },
          enumerable: true,
          configurable: true
      });
      Object.defineProperty(MatSelect.prototype, "id", {
          /** Unique id of the element. */
          get: /**
           * Unique id of the element.
           * @return {?}
           */
          function () { return this._id; },
          set: /**
           * @param {?} value
           * @return {?}
           */
          function (value) {
              this._id = value || this._uid;
              this.stateChanges.next();
          },
          enumerable: true,
          configurable: true
      });
      /**
       * @return {?}
       */
      MatSelect.prototype.ngOnInit = /**
       * @return {?}
       */
      function () {
          var _this = this;
          this._selectionModel = new collections.SelectionModel(this.multiple);
          this.stateChanges.next();
          // We need `distinctUntilChanged` here, because some browsers will
          // fire the animation end event twice for the same animation. See:
          // https://github.com/angular/angular/issues/24084
          this._panelDoneAnimatingStream
              .pipe(operators.distinctUntilChanged(), operators.takeUntil(this._destroy))
              .subscribe((/**
           * @return {?}
           */
          function () {
              if (_this.panelOpen) {
                  _this._scrollTop = 0;
                  _this.openedChange.emit(true);
              }
              else {
                  _this.openedChange.emit(false);
                  _this.overlayDir.offsetX = 0;
                  _this._changeDetectorRef.markForCheck();
              }
          }));
          this._viewportRuler.change()
              .pipe(operators.takeUntil(this._destroy))
              .subscribe((/**
           * @return {?}
           */
          function () {
              if (_this._panelOpen) {
                  _this._triggerRect = _this.trigger.nativeElement.getBoundingClientRect();
                  _this._changeDetectorRef.markForCheck();
              }
          }));
      };
      /**
       * @return {?}
       */
      MatSelect.prototype.ngAfterContentInit = /**
       * @return {?}
       */
      function () {
          var _this = this;
          this._initKeyManager();
          this._selectionModel.onChange.pipe(operators.takeUntil(this._destroy)).subscribe((/**
           * @param {?} event
           * @return {?}
           */
          function (event) {
              event.added.forEach((/**
               * @param {?} option
               * @return {?}
               */
              function (option) { return option.select(); }));
              event.removed.forEach((/**
               * @param {?} option
               * @return {?}
               */
              function (option) { return option.deselect(); }));
          }));
          this.options.changes.pipe(operators.startWith(null), operators.takeUntil(this._destroy)).subscribe((/**
           * @return {?}
           */
          function () {
              _this._resetOptions();
              _this._initializeSelection();
          }));
      };
      /**
       * @return {?}
       */
      MatSelect.prototype.ngDoCheck = /**
       * @return {?}
       */
      function () {
          if (this.ngControl) {
              this.updateErrorState();
          }
      };
      /**
       * @param {?} changes
       * @return {?}
       */
      MatSelect.prototype.ngOnChanges = /**
       * @param {?} changes
       * @return {?}
       */
      function (changes) {
          // Updating the disabled state is handled by `mixinDisabled`, but we need to additionally let
          // the parent form field know to run change detection when the disabled state changes.
          if (changes['disabled']) {
              this.stateChanges.next();
          }
      };
      /**
       * @return {?}
       */
      MatSelect.prototype.ngOnDestroy = /**
       * @return {?}
       */
      function () {
          this._destroy.next();
          this._destroy.complete();
          this.stateChanges.complete();
      };
      /** Toggles the overlay panel open or closed. */
      /**
       * Toggles the overlay panel open or closed.
       * @return {?}
       */
      MatSelect.prototype.toggle = /**
       * Toggles the overlay panel open or closed.
       * @return {?}
       */
      function () {
          this.panelOpen ? this.close() : this.open();
      };
      /** Opens the overlay panel. */
      /**
       * Opens the overlay panel.
       * @return {?}
       */
      MatSelect.prototype.open = /**
       * Opens the overlay panel.
       * @return {?}
       */
      function () {
          var _this = this;
          if (this.disabled || !this.options || !this.options.length || this._panelOpen) {
              return;
          }
          this._triggerRect = this.trigger.nativeElement.getBoundingClientRect();
          // Note: The computed font-size will be a string pixel value (e.g. "16px").
          // `parseInt` ignores the trailing 'px' and converts this to a number.
          this._triggerFontSize = parseInt(getComputedStyle(this.trigger.nativeElement).fontSize || '0');
          this._panelOpen = true;
          this._keyManager.withHorizontalOrientation(null);
          this._calculateOverlayPosition();
          this._highlightCorrectOption();
          this._changeDetectorRef.markForCheck();
          // Set the font size on the panel element once it exists.
          this._ngZone.onStable.asObservable().pipe(operators.take(1)).subscribe((/**
           * @return {?}
           */
          function () {
              if (_this._triggerFontSize && _this.overlayDir.overlayRef &&
                  _this.overlayDir.overlayRef.overlayElement) {
                  _this.overlayDir.overlayRef.overlayElement.style.fontSize = _this._triggerFontSize + "px";
              }
          }));
      };
      /** Closes the overlay panel and focuses the host element. */
      /**
       * Closes the overlay panel and focuses the host element.
       * @return {?}
       */
      MatSelect.prototype.close = /**
       * Closes the overlay panel and focuses the host element.
       * @return {?}
       */
      function () {
          if (this._panelOpen) {
              this._panelOpen = false;
              this._keyManager.withHorizontalOrientation(this._isRtl() ? 'rtl' : 'ltr');
              this._changeDetectorRef.markForCheck();
              this._onTouched();
          }
      };
      /**
       * Sets the select's value. Part of the ControlValueAccessor interface
       * required to integrate with Angular's core forms API.
       *
       * @param value New value to be written to the model.
       */
      /**
       * Sets the select's value. Part of the ControlValueAccessor interface
       * required to integrate with Angular's core forms API.
       *
       * @param {?} value New value to be written to the model.
       * @return {?}
       */
      MatSelect.prototype.writeValue = /**
       * Sets the select's value. Part of the ControlValueAccessor interface
       * required to integrate with Angular's core forms API.
       *
       * @param {?} value New value to be written to the model.
       * @return {?}
       */
      function (value) {
          if (this.options) {
              this._setSelectionByValue(value);
          }
      };
      /**
       * Saves a callback function to be invoked when the select's value
       * changes from user input. Part of the ControlValueAccessor interface
       * required to integrate with Angular's core forms API.
       *
       * @param fn Callback to be triggered when the value changes.
       */
      /**
       * Saves a callback function to be invoked when the select's value
       * changes from user input. Part of the ControlValueAccessor interface
       * required to integrate with Angular's core forms API.
       *
       * @param {?} fn Callback to be triggered when the value changes.
       * @return {?}
       */
      MatSelect.prototype.registerOnChange = /**
       * Saves a callback function to be invoked when the select's value
       * changes from user input. Part of the ControlValueAccessor interface
       * required to integrate with Angular's core forms API.
       *
       * @param {?} fn Callback to be triggered when the value changes.
       * @return {?}
       */
      function (fn) {
          this._onChange = fn;
      };
      /**
       * Saves a callback function to be invoked when the select is blurred
       * by the user. Part of the ControlValueAccessor interface required
       * to integrate with Angular's core forms API.
       *
       * @param fn Callback to be triggered when the component has been touched.
       */
      /**
       * Saves a callback function to be invoked when the select is blurred
       * by the user. Part of the ControlValueAccessor interface required
       * to integrate with Angular's core forms API.
       *
       * @param {?} fn Callback to be triggered when the component has been touched.
       * @return {?}
       */
      MatSelect.prototype.registerOnTouched = /**
       * Saves a callback function to be invoked when the select is blurred
       * by the user. Part of the ControlValueAccessor interface required
       * to integrate with Angular's core forms API.
       *
       * @param {?} fn Callback to be triggered when the component has been touched.
       * @return {?}
       */
      function (fn) {
          this._onTouched = fn;
      };
      /**
       * Disables the select. Part of the ControlValueAccessor interface required
       * to integrate with Angular's core forms API.
       *
       * @param isDisabled Sets whether the component is disabled.
       */
      /**
       * Disables the select. Part of the ControlValueAccessor interface required
       * to integrate with Angular's core forms API.
       *
       * @param {?} isDisabled Sets whether the component is disabled.
       * @return {?}
       */
      MatSelect.prototype.setDisabledState = /**
       * Disables the select. Part of the ControlValueAccessor interface required
       * to integrate with Angular's core forms API.
       *
       * @param {?} isDisabled Sets whether the component is disabled.
       * @return {?}
       */
      function (isDisabled) {
          this.disabled = isDisabled;
          this._changeDetectorRef.markForCheck();
          this.stateChanges.next();
      };
      Object.defineProperty(MatSelect.prototype, "panelOpen", {
          /** Whether or not the overlay panel is open. */
          get: /**
           * Whether or not the overlay panel is open.
           * @return {?}
           */
          function () {
              return this._panelOpen;
          },
          enumerable: true,
          configurable: true
      });
      Object.defineProperty(MatSelect.prototype, "selected", {
          /** The currently selected option. */
          get: /**
           * The currently selected option.
           * @return {?}
           */
          function () {
              return this.multiple ? this._selectionModel.selected : this._selectionModel.selected[0];
          },
          enumerable: true,
          configurable: true
      });
      Object.defineProperty(MatSelect.prototype, "triggerValue", {
          /** The value displayed in the trigger. */
          get: /**
           * The value displayed in the trigger.
           * @return {?}
           */
          function () {
              if (this.empty) {
                  return '';
              }
              if (this._multiple) {
                  /** @type {?} */
                  var selectedOptions = this._selectionModel.selected.map((/**
                   * @param {?} option
                   * @return {?}
                   */
                  function (option) { return option.viewValue; }));
                  if (this._isRtl()) {
                      selectedOptions.reverse();
                  }
                  // TODO(crisbeto): delimiter should be configurable for proper localization.
                  return selectedOptions.join(', ');
              }
              return this._selectionModel.selected[0].viewValue;
          },
          enumerable: true,
          configurable: true
      });
      /** Whether the element is in RTL mode. */
      /**
       * Whether the element is in RTL mode.
       * @return {?}
       */
      MatSelect.prototype._isRtl = /**
       * Whether the element is in RTL mode.
       * @return {?}
       */
      function () {
          return this._dir ? this._dir.value === 'rtl' : false;
      };
      /** Handles all keydown events on the select. */
      /**
       * Handles all keydown events on the select.
       * @param {?} event
       * @return {?}
       */
      MatSelect.prototype._handleKeydown = /**
       * Handles all keydown events on the select.
       * @param {?} event
       * @return {?}
       */
      function (event) {
          if (!this.disabled) {
              this.panelOpen ? this._handleOpenKeydown(event) : this._handleClosedKeydown(event);
          }
      };
      /** Handles keyboard events while the select is closed. */
      /**
       * Handles keyboard events while the select is closed.
       * @private
       * @param {?} event
       * @return {?}
       */
      MatSelect.prototype._handleClosedKeydown = /**
       * Handles keyboard events while the select is closed.
       * @private
       * @param {?} event
       * @return {?}
       */
      function (event) {
          /** @type {?} */
          var keyCode = event.keyCode;
          /** @type {?} */
          var isArrowKey = keyCode === keycodes.DOWN_ARROW || keyCode === keycodes.UP_ARROW ||
              keyCode === keycodes.LEFT_ARROW || keyCode === keycodes.RIGHT_ARROW;
          /** @type {?} */
          var isOpenKey = keyCode === keycodes.ENTER || keyCode === keycodes.SPACE;
          /** @type {?} */
          var manager = this._keyManager;
          // Open the select on ALT + arrow key to match the native <select>
          if ((isOpenKey && !keycodes.hasModifierKey(event)) || ((this.multiple || event.altKey) && isArrowKey)) {
              event.preventDefault(); // prevents the page from scrolling down when pressing space
              this.open();
          }
          else if (!this.multiple) {
              /** @type {?} */
              var previouslySelectedOption = this.selected;
              if (keyCode === keycodes.HOME || keyCode === keycodes.END) {
                  keyCode === keycodes.HOME ? manager.setFirstItemActive() : manager.setLastItemActive();
                  event.preventDefault();
              }
              else {
                  manager.onKeydown(event);
              }
              /** @type {?} */
              var selectedOption = this.selected;
              // Since the value has changed, we need to announce it ourselves.
              // @breaking-change 8.0.0 remove null check for _liveAnnouncer.
              if (this._liveAnnouncer && selectedOption && previouslySelectedOption !== selectedOption) {
                  // We set a duration on the live announcement, because we want the live element to be
                  // cleared after a while so that users can't navigate to it using the arrow keys.
                  this._liveAnnouncer.announce(((/** @type {?} */ (selectedOption))).viewValue, 10000);
              }
          }
      };
      /** Handles keyboard events when the selected is open. */
      /**
       * Handles keyboard events when the selected is open.
       * @private
       * @param {?} event
       * @return {?}
       */
      MatSelect.prototype._handleOpenKeydown = /**
       * Handles keyboard events when the selected is open.
       * @private
       * @param {?} event
       * @return {?}
       */
      function (event) {
          /** @type {?} */
          var keyCode = event.keyCode;
          /** @type {?} */
          var isArrowKey = keyCode === keycodes.DOWN_ARROW || keyCode === keycodes.UP_ARROW;
          /** @type {?} */
          var manager = this._keyManager;
          if (keyCode === keycodes.HOME || keyCode === keycodes.END) {
              event.preventDefault();
              keyCode === keycodes.HOME ? manager.setFirstItemActive() : manager.setLastItemActive();
          }
          else if (isArrowKey && event.altKey) {
              // Close the select on ALT + arrow key to match the native <select>
              event.preventDefault();
              this.close();
          }
          else if ((keyCode === keycodes.ENTER || keyCode === keycodes.SPACE) && manager.activeItem &&
              !keycodes.hasModifierKey(event)) {
              event.preventDefault();
              manager.activeItem._selectViaInteraction();
          }
          else if (this._multiple && keyCode === keycodes.A && event.ctrlKey) {
              event.preventDefault();
              /** @type {?} */
              var hasDeselectedOptions_1 = this.options.some((/**
               * @param {?} opt
               * @return {?}
               */
              function (opt) { return !opt.disabled && !opt.selected; }));
              this.options.forEach((/**
               * @param {?} option
               * @return {?}
               */
              function (option) {
                  if (!option.disabled) {
                      hasDeselectedOptions_1 ? option.select() : option.deselect();
                  }
              }));
          }
          else {
              /** @type {?} */
              var previouslyFocusedIndex = manager.activeItemIndex;
              manager.onKeydown(event);
              if (this._multiple && isArrowKey && event.shiftKey && manager.activeItem &&
                  manager.activeItemIndex !== previouslyFocusedIndex) {
                  manager.activeItem._selectViaInteraction();
              }
          }
      };
      /**
       * @return {?}
       */
      MatSelect.prototype._onFocus = /**
       * @return {?}
       */
      function () {
          if (!this.disabled) {
              this._focused = true;
              this.stateChanges.next();
          }
      };
      /**
       * Calls the touched callback only if the panel is closed. Otherwise, the trigger will
       * "blur" to the panel when it opens, causing a false positive.
       */
      /**
       * Calls the touched callback only if the panel is closed. Otherwise, the trigger will
       * "blur" to the panel when it opens, causing a false positive.
       * @return {?}
       */
      MatSelect.prototype._onBlur = /**
       * Calls the touched callback only if the panel is closed. Otherwise, the trigger will
       * "blur" to the panel when it opens, causing a false positive.
       * @return {?}
       */
      function () {
          this._focused = false;
          if (!this.disabled && !this.panelOpen) {
              this._onTouched();
              this._changeDetectorRef.markForCheck();
              this.stateChanges.next();
          }
      };
      /**
       * Callback that is invoked when the overlay panel has been attached.
       */
      /**
       * Callback that is invoked when the overlay panel has been attached.
       * @return {?}
       */
      MatSelect.prototype._onAttached = /**
       * Callback that is invoked when the overlay panel has been attached.
       * @return {?}
       */
      function () {
          var _this = this;
          this.overlayDir.positionChange.pipe(operators.take(1)).subscribe((/**
           * @return {?}
           */
          function () {
              _this._changeDetectorRef.detectChanges();
              _this._calculateOverlayOffsetX();
              _this.panel.nativeElement.scrollTop = _this._scrollTop;
          }));
      };
      /** Returns the theme to be used on the panel. */
      /**
       * Returns the theme to be used on the panel.
       * @return {?}
       */
      MatSelect.prototype._getPanelTheme = /**
       * Returns the theme to be used on the panel.
       * @return {?}
       */
      function () {
          return this._parentFormField ? "mat-" + this._parentFormField.color : '';
      };
      Object.defineProperty(MatSelect.prototype, "empty", {
          /** Whether the select has a value. */
          get: /**
           * Whether the select has a value.
           * @return {?}
           */
          function () {
              return !this._selectionModel || this._selectionModel.isEmpty();
          },
          enumerable: true,
          configurable: true
      });
      /**
       * @private
       * @return {?}
       */
      MatSelect.prototype._initializeSelection = /**
       * @private
       * @return {?}
       */
      function () {
          var _this = this;
          // Defer setting the value in order to avoid the "Expression
          // has changed after it was checked" errors from Angular.
          Promise.resolve().then((/**
           * @return {?}
           */
          function () {
              _this._setSelectionByValue(_this.ngControl ? _this.ngControl.value : _this._value);
              _this.stateChanges.next();
          }));
      };
      /**
       * Sets the selected option based on a value. If no option can be
       * found with the designated value, the select trigger is cleared.
       */
      /**
       * Sets the selected option based on a value. If no option can be
       * found with the designated value, the select trigger is cleared.
       * @private
       * @param {?} value
       * @return {?}
       */
      MatSelect.prototype._setSelectionByValue = /**
       * Sets the selected option based on a value. If no option can be
       * found with the designated value, the select trigger is cleared.
       * @private
       * @param {?} value
       * @return {?}
       */
      function (value) {
          var _this = this;
          if (this.multiple && value) {
              if (!Array.isArray(value)) {
                  throw getMatSelectNonArrayValueError();
              }
              this._selectionModel.clear();
              value.forEach((/**
               * @param {?} currentValue
               * @return {?}
               */
              function (currentValue) { return _this._selectValue(currentValue); }));
              this._sortValues();
          }
          else {
              this._selectionModel.clear();
              /** @type {?} */
              var correspondingOption = this._selectValue(value);
              // Shift focus to the active item. Note that we shouldn't do this in multiple
              // mode, because we don't know what option the user interacted with last.
              if (correspondingOption) {
                  this._keyManager.setActiveItem(correspondingOption);
              }
          }
          this._changeDetectorRef.markForCheck();
      };
      /**
       * Finds and selects and option based on its value.
       * @returns Option that has the corresponding value.
       */
      /**
       * Finds and selects and option based on its value.
       * @private
       * @param {?} value
       * @return {?} Option that has the corresponding value.
       */
      MatSelect.prototype._selectValue = /**
       * Finds and selects and option based on its value.
       * @private
       * @param {?} value
       * @return {?} Option that has the corresponding value.
       */
      function (value) {
          var _this = this;
          /** @type {?} */
          var correspondingOption = this.options.find((/**
           * @param {?} option
           * @return {?}
           */
          function (option) {
              try {
                  // Treat null as a special reset value.
                  return option.value != null && _this._compareWith(option.value, value);
              }
              catch (error) {
                  if (core.isDevMode()) {
                      // Notify developers of errors in their comparator.
                      console.warn(error);
                  }
                  return false;
              }
          }));
          if (correspondingOption) {
              this._selectionModel.select(correspondingOption);
          }
          return correspondingOption;
      };
      /** Sets up a key manager to listen to keyboard events on the overlay panel. */
      /**
       * Sets up a key manager to listen to keyboard events on the overlay panel.
       * @private
       * @return {?}
       */
      MatSelect.prototype._initKeyManager = /**
       * Sets up a key manager to listen to keyboard events on the overlay panel.
       * @private
       * @return {?}
       */
      function () {
          var _this = this;
          this._keyManager = new a11y.ActiveDescendantKeyManager(this.options)
              .withTypeAhead()
              .withVerticalOrientation()
              .withHorizontalOrientation(this._isRtl() ? 'rtl' : 'ltr')
              .withAllowedModifierKeys(['shiftKey']);
          this._keyManager.tabOut.pipe(operators.takeUntil(this._destroy)).subscribe((/**
           * @return {?}
           */
          function () {
              // Restore focus to the trigger before closing. Ensures that the focus
              // position won't be lost if the user got focus into the overlay.
              _this.focus();
              _this.close();
          }));
          this._keyManager.change.pipe(operators.takeUntil(this._destroy)).subscribe((/**
           * @return {?}
           */
          function () {
              if (_this._panelOpen && _this.panel) {
                  _this._scrollActiveOptionIntoView();
              }
              else if (!_this._panelOpen && !_this.multiple && _this._keyManager.activeItem) {
                  _this._keyManager.activeItem._selectViaInteraction();
              }
          }));
      };
      /** Drops current option subscriptions and IDs and resets from scratch. */
      /**
       * Drops current option subscriptions and IDs and resets from scratch.
       * @private
       * @return {?}
       */
      MatSelect.prototype._resetOptions = /**
       * Drops current option subscriptions and IDs and resets from scratch.
       * @private
       * @return {?}
       */
      function () {
          var _this = this;
          /** @type {?} */
          var changedOrDestroyed = rxjs.merge(this.options.changes, this._destroy);
          this.optionSelectionChanges.pipe(operators.takeUntil(changedOrDestroyed)).subscribe((/**
           * @param {?} event
           * @return {?}
           */
          function (event) {
              _this._onSelect(event.source, event.isUserInput);
              if (event.isUserInput && !_this.multiple && _this._panelOpen) {
                  _this.close();
                  _this.focus();
              }
          }));
          // Listen to changes in the internal state of the options and react accordingly.
          // Handles cases like the labels of the selected options changing.
          rxjs.merge.apply(void 0, this.options.map((/**
           * @param {?} option
           * @return {?}
           */
          function (option) { return option._stateChanges; }))).pipe(operators.takeUntil(changedOrDestroyed))
              .subscribe((/**
           * @return {?}
           */
          function () {
              _this._changeDetectorRef.markForCheck();
              _this.stateChanges.next();
          }));
          this._setOptionIds();
      };
      /** Invoked when an option is clicked. */
      /**
       * Invoked when an option is clicked.
       * @private
       * @param {?} option
       * @param {?} isUserInput
       * @return {?}
       */
      MatSelect.prototype._onSelect = /**
       * Invoked when an option is clicked.
       * @private
       * @param {?} option
       * @param {?} isUserInput
       * @return {?}
       */
      function (option, isUserInput) {
          /** @type {?} */
          var wasSelected = this._selectionModel.isSelected(option);
          if (option.value == null && !this._multiple) {
              option.deselect();
              this._selectionModel.clear();
              this._propagateChanges(option.value);
          }
          else {
              option.selected ? this._selectionModel.select(option) : this._selectionModel.deselect(option);
              if (isUserInput) {
                  this._keyManager.setActiveItem(option);
              }
              if (this.multiple) {
                  this._sortValues();
                  if (isUserInput) {
                      // In case the user selected the option with their mouse, we
                      // want to restore focus back to the trigger, in order to
                      // prevent the select keyboard controls from clashing with
                      // the ones from `mat-option`.
                      this.focus();
                  }
              }
          }
          if (wasSelected !== this._selectionModel.isSelected(option)) {
              this._propagateChanges();
          }
          this.stateChanges.next();
      };
      /** Sorts the selected values in the selected based on their order in the panel. */
      /**
       * Sorts the selected values in the selected based on their order in the panel.
       * @private
       * @return {?}
       */
      MatSelect.prototype._sortValues = /**
       * Sorts the selected values in the selected based on their order in the panel.
       * @private
       * @return {?}
       */
      function () {
          var _this = this;
          if (this.multiple) {
              /** @type {?} */
              var options_1 = this.options.toArray();
              this._selectionModel.sort((/**
               * @param {?} a
               * @param {?} b
               * @return {?}
               */
              function (a, b) {
                  return _this.sortComparator ? _this.sortComparator(a, b, options_1) :
                      options_1.indexOf(a) - options_1.indexOf(b);
              }));
              this.stateChanges.next();
          }
      };
      /** Emits change event to set the model value. */
      /**
       * Emits change event to set the model value.
       * @private
       * @param {?=} fallbackValue
       * @return {?}
       */
      MatSelect.prototype._propagateChanges = /**
       * Emits change event to set the model value.
       * @private
       * @param {?=} fallbackValue
       * @return {?}
       */
      function (fallbackValue) {
          /** @type {?} */
          var valueToEmit = null;
          if (this.multiple) {
              valueToEmit = ((/** @type {?} */ (this.selected))).map((/**
               * @param {?} option
               * @return {?}
               */
              function (option) { return option.value; }));
          }
          else {
              valueToEmit = this.selected ? ((/** @type {?} */ (this.selected))).value : fallbackValue;
          }
          this._value = valueToEmit;
          this.valueChange.emit(valueToEmit);
          this._onChange(valueToEmit);
          this.selectionChange.emit(new MatSelectChange(this, valueToEmit));
          this._changeDetectorRef.markForCheck();
      };
      /** Records option IDs to pass to the aria-owns property. */
      /**
       * Records option IDs to pass to the aria-owns property.
       * @private
       * @return {?}
       */
      MatSelect.prototype._setOptionIds = /**
       * Records option IDs to pass to the aria-owns property.
       * @private
       * @return {?}
       */
      function () {
          this._optionIds = this.options.map((/**
           * @param {?} option
           * @return {?}
           */
          function (option) { return option.id; })).join(' ');
      };
      /**
       * Highlights the selected item. If no option is selected, it will highlight
       * the first item instead.
       */
      /**
       * Highlights the selected item. If no option is selected, it will highlight
       * the first item instead.
       * @private
       * @return {?}
       */
      MatSelect.prototype._highlightCorrectOption = /**
       * Highlights the selected item. If no option is selected, it will highlight
       * the first item instead.
       * @private
       * @return {?}
       */
      function () {
          if (this._keyManager) {
              if (this.empty) {
                  this._keyManager.setFirstItemActive();
              }
              else {
                  this._keyManager.setActiveItem(this._selectionModel.selected[0]);
              }
          }
      };
      /** Scrolls the active option into view. */
      /**
       * Scrolls the active option into view.
       * @private
       * @return {?}
       */
      MatSelect.prototype._scrollActiveOptionIntoView = /**
       * Scrolls the active option into view.
       * @private
       * @return {?}
       */
      function () {
          /** @type {?} */
          var activeOptionIndex = this._keyManager.activeItemIndex || 0;
          /** @type {?} */
          var labelCount = core$1._countGroupLabelsBeforeOption(activeOptionIndex, this.options, this.optionGroups);
          this.panel.nativeElement.scrollTop = core$1._getOptionScrollPosition(activeOptionIndex + labelCount, this._getItemHeight(), this.panel.nativeElement.scrollTop, SELECT_PANEL_MAX_HEIGHT);
      };
      /** Focuses the select element. */
      /**
       * Focuses the select element.
       * @param {?=} options
       * @return {?}
       */
      MatSelect.prototype.focus = /**
       * Focuses the select element.
       * @param {?=} options
       * @return {?}
       */
      function (options) {
          this._elementRef.nativeElement.focus(options);
      };
      /** Gets the index of the provided option in the option list. */
      /**
       * Gets the index of the provided option in the option list.
       * @private
       * @param {?} option
       * @return {?}
       */
      MatSelect.prototype._getOptionIndex = /**
       * Gets the index of the provided option in the option list.
       * @private
       * @param {?} option
       * @return {?}
       */
      function (option) {
          return this.options.reduce((/**
           * @param {?} result
           * @param {?} current
           * @param {?} index
           * @return {?}
           */
          function (result, current, index) {
              return result === undefined ? (option === current ? index : undefined) : result;
          }), undefined);
      };
      /** Calculates the scroll position and x- and y-offsets of the overlay panel. */
      /**
       * Calculates the scroll position and x- and y-offsets of the overlay panel.
       * @private
       * @return {?}
       */
      MatSelect.prototype._calculateOverlayPosition = /**
       * Calculates the scroll position and x- and y-offsets of the overlay panel.
       * @private
       * @return {?}
       */
      function () {
          /** @type {?} */
          var itemHeight = this._getItemHeight();
          /** @type {?} */
          var items = this._getItemCount();
          /** @type {?} */
          var panelHeight = Math.min(items * itemHeight, SELECT_PANEL_MAX_HEIGHT);
          /** @type {?} */
          var scrollContainerHeight = items * itemHeight;
          // The farthest the panel can be scrolled before it hits the bottom
          /** @type {?} */
          var maxScroll = scrollContainerHeight - panelHeight;
          // If no value is selected we open the popup to the first item.
          /** @type {?} */
          var selectedOptionOffset = this.empty ? 0 : (/** @type {?} */ (this._getOptionIndex(this._selectionModel.selected[0])));
          selectedOptionOffset += core$1._countGroupLabelsBeforeOption(selectedOptionOffset, this.options, this.optionGroups);
          // We must maintain a scroll buffer so the selected option will be scrolled to the
          // center of the overlay panel rather than the top.
          /** @type {?} */
          var scrollBuffer = panelHeight / 2;
          this._scrollTop = this._calculateOverlayScroll(selectedOptionOffset, scrollBuffer, maxScroll);
          this._offsetY = this._calculateOverlayOffsetY(selectedOptionOffset, scrollBuffer, maxScroll);
          this._checkOverlayWithinViewport(maxScroll);
      };
      /**
       * Calculates the scroll position of the select's overlay panel.
       *
       * Attempts to center the selected option in the panel. If the option is
       * too high or too low in the panel to be scrolled to the center, it clamps the
       * scroll position to the min or max scroll positions respectively.
       */
      /**
       * Calculates the scroll position of the select's overlay panel.
       *
       * Attempts to center the selected option in the panel. If the option is
       * too high or too low in the panel to be scrolled to the center, it clamps the
       * scroll position to the min or max scroll positions respectively.
       * @param {?} selectedIndex
       * @param {?} scrollBuffer
       * @param {?} maxScroll
       * @return {?}
       */
      MatSelect.prototype._calculateOverlayScroll = /**
       * Calculates the scroll position of the select's overlay panel.
       *
       * Attempts to center the selected option in the panel. If the option is
       * too high or too low in the panel to be scrolled to the center, it clamps the
       * scroll position to the min or max scroll positions respectively.
       * @param {?} selectedIndex
       * @param {?} scrollBuffer
       * @param {?} maxScroll
       * @return {?}
       */
      function (selectedIndex, scrollBuffer, maxScroll) {
          /** @type {?} */
          var itemHeight = this._getItemHeight();
          /** @type {?} */
          var optionOffsetFromScrollTop = itemHeight * selectedIndex;
          /** @type {?} */
          var halfOptionHeight = itemHeight / 2;
          // Starts at the optionOffsetFromScrollTop, which scrolls the option to the top of the
          // scroll container, then subtracts the scroll buffer to scroll the option down to
          // the center of the overlay panel. Half the option height must be re-added to the
          // scrollTop so the option is centered based on its middle, not its top edge.
          /** @type {?} */
          var optimalScrollPosition = optionOffsetFromScrollTop - scrollBuffer + halfOptionHeight;
          return Math.min(Math.max(0, optimalScrollPosition), maxScroll);
      };
      /** Returns the aria-label of the select component. */
      /**
       * Returns the aria-label of the select component.
       * @return {?}
       */
      MatSelect.prototype._getAriaLabel = /**
       * Returns the aria-label of the select component.
       * @return {?}
       */
      function () {
          // If an ariaLabelledby value has been set by the consumer, the select should not overwrite the
          // `aria-labelledby` value by setting the ariaLabel to the placeholder.
          return this.ariaLabelledby ? null : this.ariaLabel || this.placeholder;
      };
      /** Returns the aria-labelledby of the select component. */
      /**
       * Returns the aria-labelledby of the select component.
       * @return {?}
       */
      MatSelect.prototype._getAriaLabelledby = /**
       * Returns the aria-labelledby of the select component.
       * @return {?}
       */
      function () {
          if (this.ariaLabelledby) {
              return this.ariaLabelledby;
          }
          // Note: we use `_getAriaLabel` here, because we want to check whether there's a
          // computed label. `this.ariaLabel` is only the user-specified label.
          if (!this._parentFormField || !this._parentFormField._hasFloatingLabel() ||
              this._getAriaLabel()) {
              return null;
          }
          return this._parentFormField._labelId || null;
      };
      /** Determines the `aria-activedescendant` to be set on the host. */
      /**
       * Determines the `aria-activedescendant` to be set on the host.
       * @return {?}
       */
      MatSelect.prototype._getAriaActiveDescendant = /**
       * Determines the `aria-activedescendant` to be set on the host.
       * @return {?}
       */
      function () {
          if (this.panelOpen && this._keyManager && this._keyManager.activeItem) {
              return this._keyManager.activeItem.id;
          }
          return null;
      };
      /**
       * Sets the x-offset of the overlay panel in relation to the trigger's top start corner.
       * This must be adjusted to align the selected option text over the trigger text when
       * the panel opens. Will change based on LTR or RTL text direction. Note that the offset
       * can't be calculated until the panel has been attached, because we need to know the
       * content width in order to constrain the panel within the viewport.
       */
      /**
       * Sets the x-offset of the overlay panel in relation to the trigger's top start corner.
       * This must be adjusted to align the selected option text over the trigger text when
       * the panel opens. Will change based on LTR or RTL text direction. Note that the offset
       * can't be calculated until the panel has been attached, because we need to know the
       * content width in order to constrain the panel within the viewport.
       * @private
       * @return {?}
       */
      MatSelect.prototype._calculateOverlayOffsetX = /**
       * Sets the x-offset of the overlay panel in relation to the trigger's top start corner.
       * This must be adjusted to align the selected option text over the trigger text when
       * the panel opens. Will change based on LTR or RTL text direction. Note that the offset
       * can't be calculated until the panel has been attached, because we need to know the
       * content width in order to constrain the panel within the viewport.
       * @private
       * @return {?}
       */
      function () {
          /** @type {?} */
          var overlayRect = this.overlayDir.overlayRef.overlayElement.getBoundingClientRect();
          /** @type {?} */
          var viewportSize = this._viewportRuler.getViewportSize();
          /** @type {?} */
          var isRtl = this._isRtl();
          /** @type {?} */
          var paddingWidth = this.multiple ? SELECT_MULTIPLE_PANEL_PADDING_X + SELECT_PANEL_PADDING_X :
              SELECT_PANEL_PADDING_X * 2;
          /** @type {?} */
          var offsetX;
          // Adjust the offset, depending on the option padding.
          if (this.multiple) {
              offsetX = SELECT_MULTIPLE_PANEL_PADDING_X;
          }
          else {
              /** @type {?} */
              var selected = this._selectionModel.selected[0] || this.options.first;
              offsetX = selected && selected.group ? SELECT_PANEL_INDENT_PADDING_X : SELECT_PANEL_PADDING_X;
          }
          // Invert the offset in LTR.
          if (!isRtl) {
              offsetX *= -1;
          }
          // Determine how much the select overflows on each side.
          /** @type {?} */
          var leftOverflow = 0 - (overlayRect.left + offsetX - (isRtl ? paddingWidth : 0));
          /** @type {?} */
          var rightOverflow = overlayRect.right + offsetX - viewportSize.width
              + (isRtl ? 0 : paddingWidth);
          // If the element overflows on either side, reduce the offset to allow it to fit.
          if (leftOverflow > 0) {
              offsetX += leftOverflow + SELECT_PANEL_VIEWPORT_PADDING;
          }
          else if (rightOverflow > 0) {
              offsetX -= rightOverflow + SELECT_PANEL_VIEWPORT_PADDING;
          }
          // Set the offset directly in order to avoid having to go through change detection and
          // potentially triggering "changed after it was checked" errors. Round the value to avoid
          // blurry content in some browsers.
          this.overlayDir.offsetX = Math.round(offsetX);
          this.overlayDir.overlayRef.updatePosition();
      };
      /**
       * Calculates the y-offset of the select's overlay panel in relation to the
       * top start corner of the trigger. It has to be adjusted in order for the
       * selected option to be aligned over the trigger when the panel opens.
       */
      /**
       * Calculates the y-offset of the select's overlay panel in relation to the
       * top start corner of the trigger. It has to be adjusted in order for the
       * selected option to be aligned over the trigger when the panel opens.
       * @private
       * @param {?} selectedIndex
       * @param {?} scrollBuffer
       * @param {?} maxScroll
       * @return {?}
       */
      MatSelect.prototype._calculateOverlayOffsetY = /**
       * Calculates the y-offset of the select's overlay panel in relation to the
       * top start corner of the trigger. It has to be adjusted in order for the
       * selected option to be aligned over the trigger when the panel opens.
       * @private
       * @param {?} selectedIndex
       * @param {?} scrollBuffer
       * @param {?} maxScroll
       * @return {?}
       */
      function (selectedIndex, scrollBuffer, maxScroll) {
          /** @type {?} */
          var itemHeight = this._getItemHeight();
          /** @type {?} */
          var optionHeightAdjustment = (itemHeight - this._triggerRect.height) / 2;
          /** @type {?} */
          var maxOptionsDisplayed = Math.floor(SELECT_PANEL_MAX_HEIGHT / itemHeight);
          /** @type {?} */
          var optionOffsetFromPanelTop;
          // Disable offset if requested by user by returning 0 as value to offset
          if (this._disableOptionCentering) {
              return 0;
          }
          if (this._scrollTop === 0) {
              optionOffsetFromPanelTop = selectedIndex * itemHeight;
          }
          else if (this._scrollTop === maxScroll) {
              /** @type {?} */
              var firstDisplayedIndex = this._getItemCount() - maxOptionsDisplayed;
              /** @type {?} */
              var selectedDisplayIndex = selectedIndex - firstDisplayedIndex;
              // The first item is partially out of the viewport. Therefore we need to calculate what
              // portion of it is shown in the viewport and account for it in our offset.
              /** @type {?} */
              var partialItemHeight = itemHeight - (this._getItemCount() * itemHeight - SELECT_PANEL_MAX_HEIGHT) % itemHeight;
              // Because the panel height is longer than the height of the options alone,
              // there is always extra padding at the top or bottom of the panel. When
              // scrolled to the very bottom, this padding is at the top of the panel and
              // must be added to the offset.
              optionOffsetFromPanelTop = selectedDisplayIndex * itemHeight + partialItemHeight;
          }
          else {
              // If the option was scrolled to the middle of the panel using a scroll buffer,
              // its offset will be the scroll buffer minus the half height that was added to
              // center it.
              optionOffsetFromPanelTop = scrollBuffer - itemHeight / 2;
          }
          // The final offset is the option's offset from the top, adjusted for the height difference,
          // multiplied by -1 to ensure that the overlay moves in the correct direction up the page.
          // The value is rounded to prevent some browsers from blurring the content.
          return Math.round(optionOffsetFromPanelTop * -1 - optionHeightAdjustment);
      };
      /**
       * Checks that the attempted overlay position will fit within the viewport.
       * If it will not fit, tries to adjust the scroll position and the associated
       * y-offset so the panel can open fully on-screen. If it still won't fit,
       * sets the offset back to 0 to allow the fallback position to take over.
       */
      /**
       * Checks that the attempted overlay position will fit within the viewport.
       * If it will not fit, tries to adjust the scroll position and the associated
       * y-offset so the panel can open fully on-screen. If it still won't fit,
       * sets the offset back to 0 to allow the fallback position to take over.
       * @private
       * @param {?} maxScroll
       * @return {?}
       */
      MatSelect.prototype._checkOverlayWithinViewport = /**
       * Checks that the attempted overlay position will fit within the viewport.
       * If it will not fit, tries to adjust the scroll position and the associated
       * y-offset so the panel can open fully on-screen. If it still won't fit,
       * sets the offset back to 0 to allow the fallback position to take over.
       * @private
       * @param {?} maxScroll
       * @return {?}
       */
      function (maxScroll) {
          /** @type {?} */
          var itemHeight = this._getItemHeight();
          /** @type {?} */
          var viewportSize = this._viewportRuler.getViewportSize();
          /** @type {?} */
          var topSpaceAvailable = this._triggerRect.top - SELECT_PANEL_VIEWPORT_PADDING;
          /** @type {?} */
          var bottomSpaceAvailable = viewportSize.height - this._triggerRect.bottom - SELECT_PANEL_VIEWPORT_PADDING;
          /** @type {?} */
          var panelHeightTop = Math.abs(this._offsetY);
          /** @type {?} */
          var totalPanelHeight = Math.min(this._getItemCount() * itemHeight, SELECT_PANEL_MAX_HEIGHT);
          /** @type {?} */
          var panelHeightBottom = totalPanelHeight - panelHeightTop - this._triggerRect.height;
          if (panelHeightBottom > bottomSpaceAvailable) {
              this._adjustPanelUp(panelHeightBottom, bottomSpaceAvailable);
          }
          else if (panelHeightTop > topSpaceAvailable) {
              this._adjustPanelDown(panelHeightTop, topSpaceAvailable, maxScroll);
          }
          else {
              this._transformOrigin = this._getOriginBasedOnOption();
          }
      };
      /** Adjusts the overlay panel up to fit in the viewport. */
      /**
       * Adjusts the overlay panel up to fit in the viewport.
       * @private
       * @param {?} panelHeightBottom
       * @param {?} bottomSpaceAvailable
       * @return {?}
       */
      MatSelect.prototype._adjustPanelUp = /**
       * Adjusts the overlay panel up to fit in the viewport.
       * @private
       * @param {?} panelHeightBottom
       * @param {?} bottomSpaceAvailable
       * @return {?}
       */
      function (panelHeightBottom, bottomSpaceAvailable) {
          // Browsers ignore fractional scroll offsets, so we need to round.
          /** @type {?} */
          var distanceBelowViewport = Math.round(panelHeightBottom - bottomSpaceAvailable);
          // Scrolls the panel up by the distance it was extending past the boundary, then
          // adjusts the offset by that amount to move the panel up into the viewport.
          this._scrollTop -= distanceBelowViewport;
          this._offsetY -= distanceBelowViewport;
          this._transformOrigin = this._getOriginBasedOnOption();
          // If the panel is scrolled to the very top, it won't be able to fit the panel
          // by scrolling, so set the offset to 0 to allow the fallback position to take
          // effect.
          if (this._scrollTop <= 0) {
              this._scrollTop = 0;
              this._offsetY = 0;
              this._transformOrigin = "50% bottom 0px";
          }
      };
      /** Adjusts the overlay panel down to fit in the viewport. */
      /**
       * Adjusts the overlay panel down to fit in the viewport.
       * @private
       * @param {?} panelHeightTop
       * @param {?} topSpaceAvailable
       * @param {?} maxScroll
       * @return {?}
       */
      MatSelect.prototype._adjustPanelDown = /**
       * Adjusts the overlay panel down to fit in the viewport.
       * @private
       * @param {?} panelHeightTop
       * @param {?} topSpaceAvailable
       * @param {?} maxScroll
       * @return {?}
       */
      function (panelHeightTop, topSpaceAvailable, maxScroll) {
          // Browsers ignore fractional scroll offsets, so we need to round.
          /** @type {?} */
          var distanceAboveViewport = Math.round(panelHeightTop - topSpaceAvailable);
          // Scrolls the panel down by the distance it was extending past the boundary, then
          // adjusts the offset by that amount to move the panel down into the viewport.
          this._scrollTop += distanceAboveViewport;
          this._offsetY += distanceAboveViewport;
          this._transformOrigin = this._getOriginBasedOnOption();
          // If the panel is scrolled to the very bottom, it won't be able to fit the
          // panel by scrolling, so set the offset to 0 to allow the fallback position
          // to take effect.
          if (this._scrollTop >= maxScroll) {
              this._scrollTop = maxScroll;
              this._offsetY = 0;
              this._transformOrigin = "50% top 0px";
              return;
          }
      };
      /** Sets the transform origin point based on the selected option. */
      /**
       * Sets the transform origin point based on the selected option.
       * @private
       * @return {?}
       */
      MatSelect.prototype._getOriginBasedOnOption = /**
       * Sets the transform origin point based on the selected option.
       * @private
       * @return {?}
       */
      function () {
          /** @type {?} */
          var itemHeight = this._getItemHeight();
          /** @type {?} */
          var optionHeightAdjustment = (itemHeight - this._triggerRect.height) / 2;
          /** @type {?} */
          var originY = Math.abs(this._offsetY) - optionHeightAdjustment + itemHeight / 2;
          return "50% " + originY + "px 0px";
      };
      /** Calculates the amount of items in the select. This includes options and group labels. */
      /**
       * Calculates the amount of items in the select. This includes options and group labels.
       * @private
       * @return {?}
       */
      MatSelect.prototype._getItemCount = /**
       * Calculates the amount of items in the select. This includes options and group labels.
       * @private
       * @return {?}
       */
      function () {
          return this.options.length + this.optionGroups.length;
      };
      /** Calculates the height of the select's options. */
      /**
       * Calculates the height of the select's options.
       * @private
       * @return {?}
       */
      MatSelect.prototype._getItemHeight = /**
       * Calculates the height of the select's options.
       * @private
       * @return {?}
       */
      function () {
          return this._triggerFontSize * SELECT_ITEM_HEIGHT_EM;
      };
      /**
       * Implemented as part of MatFormFieldControl.
       * @docs-private
       */
      /**
       * Implemented as part of MatFormFieldControl.
       * \@docs-private
       * @param {?} ids
       * @return {?}
       */
      MatSelect.prototype.setDescribedByIds = /**
       * Implemented as part of MatFormFieldControl.
       * \@docs-private
       * @param {?} ids
       * @return {?}
       */
      function (ids) {
          this._ariaDescribedby = ids.join(' ');
      };
      /**
       * Implemented as part of MatFormFieldControl.
       * @docs-private
       */
      /**
       * Implemented as part of MatFormFieldControl.
       * \@docs-private
       * @return {?}
       */
      MatSelect.prototype.onContainerClick = /**
       * Implemented as part of MatFormFieldControl.
       * \@docs-private
       * @return {?}
       */
      function () {
          this.focus();
          this.open();
      };
      Object.defineProperty(MatSelect.prototype, "shouldLabelFloat", {
          /**
           * Implemented as part of MatFormFieldControl.
           * @docs-private
           */
          get: /**
           * Implemented as part of MatFormFieldControl.
           * \@docs-private
           * @return {?}
           */
          function () {
              return this._panelOpen || !this.empty;
          },
          enumerable: true,
          configurable: true
      });
      MatSelect.decorators = [
          { type: core.Component, args: [{selector: 'mat-select',
                      exportAs: 'matSelect',
                      template: "<div cdk-overlay-origin class=\"mat-select-trigger\" aria-hidden=\"true\" (click)=\"toggle()\" #origin=\"cdkOverlayOrigin\" #trigger><div class=\"mat-select-value\" [ngSwitch]=\"empty\"><span class=\"mat-select-placeholder\" *ngSwitchCase=\"true\">{{placeholder || '\u00A0'}}</span> <span class=\"mat-select-value-text\" *ngSwitchCase=\"false\" [ngSwitch]=\"!!customTrigger\"><span *ngSwitchDefault>{{triggerValue || '\u00A0'}}</span><ng-content select=\"mat-select-trigger\" *ngSwitchCase=\"true\"></ng-content></span></div><div class=\"mat-select-arrow-wrapper\"><div class=\"mat-select-arrow\"></div></div></div><ng-template cdk-connected-overlay cdkConnectedOverlayLockPosition cdkConnectedOverlayHasBackdrop cdkConnectedOverlayBackdropClass=\"cdk-overlay-transparent-backdrop\" [cdkConnectedOverlayScrollStrategy]=\"_scrollStrategy\" [cdkConnectedOverlayOrigin]=\"origin\" [cdkConnectedOverlayOpen]=\"panelOpen\" [cdkConnectedOverlayPositions]=\"_positions\" [cdkConnectedOverlayMinWidth]=\"_triggerRect?.width\" [cdkConnectedOverlayOffsetY]=\"_offsetY\" (backdropClick)=\"close()\" (attach)=\"_onAttached()\" (detach)=\"close()\"><div class=\"mat-select-panel-wrap\" [@transformPanelWrap]><div #panel class=\"mat-select-panel {{ _getPanelTheme() }}\" [ngClass]=\"panelClass\" [@transformPanel]=\"multiple ? 'showing-multiple' : 'showing'\" (@transformPanel.done)=\"_panelDoneAnimatingStream.next($event.toState)\" [style.transformOrigin]=\"_transformOrigin\" [style.font-size.px]=\"_triggerFontSize\" (keydown)=\"_handleKeydown($event)\"><ng-content></ng-content></div></div></ng-template>",
                      styles: [".mat-select{display:inline-block;width:100%;outline:0}.mat-select-trigger{display:inline-table;cursor:pointer;position:relative;box-sizing:border-box}.mat-select-disabled .mat-select-trigger{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;cursor:default}.mat-select-value{display:table-cell;max-width:0;width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mat-select-value-text{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mat-select-arrow-wrapper{display:table-cell;vertical-align:middle}.mat-form-field-appearance-fill .mat-select-arrow-wrapper{transform:translateY(-50%)}.mat-form-field-appearance-outline .mat-select-arrow-wrapper{transform:translateY(-25%)}.mat-form-field-appearance-standard.mat-form-field-has-label .mat-select:not(.mat-select-empty) .mat-select-arrow-wrapper{transform:translateY(-50%)}.mat-form-field-appearance-standard .mat-select.mat-select-empty .mat-select-arrow-wrapper{transition:transform .4s cubic-bezier(.25,.8,.25,1)}._mat-animation-noopable.mat-form-field-appearance-standard .mat-select.mat-select-empty .mat-select-arrow-wrapper{transition:none}.mat-select-arrow{width:0;height:0;border-left:5px solid transparent;border-right:5px solid transparent;border-top:5px solid;margin:0 4px}.mat-select-panel-wrap{flex-basis:100%}.mat-select-panel{min-width:112px;max-width:280px;overflow:auto;-webkit-overflow-scrolling:touch;padding-top:0;padding-bottom:0;max-height:256px;min-width:100%;border-radius:4px}@media (-ms-high-contrast:active){.mat-select-panel{outline:solid 1px}}.mat-select-panel .mat-optgroup-label,.mat-select-panel .mat-option{font-size:inherit;line-height:3em;height:3em}.mat-form-field-type-mat-select:not(.mat-form-field-disabled) .mat-form-field-flex{cursor:pointer}.mat-form-field-type-mat-select .mat-form-field-label{width:calc(100% - 18px)}.mat-select-placeholder{transition:color .4s .133s cubic-bezier(.25,.8,.25,1)}._mat-animation-noopable .mat-select-placeholder{transition:none}.mat-form-field-hide-placeholder .mat-select-placeholder{color:transparent;-webkit-text-fill-color:transparent;transition:none;display:block}"],
                      inputs: ['disabled', 'disableRipple', 'tabIndex'],
                      encapsulation: core.ViewEncapsulation.None,
                      changeDetection: core.ChangeDetectionStrategy.OnPush,
                      host: {
                          'role': 'listbox',
                          '[attr.id]': 'id',
                          '[attr.tabindex]': 'tabIndex',
                          '[attr.aria-label]': '_getAriaLabel()',
                          '[attr.aria-labelledby]': '_getAriaLabelledby()',
                          '[attr.aria-required]': 'required.toString()',
                          '[attr.aria-disabled]': 'disabled.toString()',
                          '[attr.aria-invalid]': 'errorState',
                          '[attr.aria-owns]': 'panelOpen ? _optionIds : null',
                          '[attr.aria-multiselectable]': 'multiple',
                          '[attr.aria-describedby]': '_ariaDescribedby || null',
                          '[attr.aria-activedescendant]': '_getAriaActiveDescendant()',
                          '[class.mat-select-disabled]': 'disabled',
                          '[class.mat-select-invalid]': 'errorState',
                          '[class.mat-select-required]': 'required',
                          '[class.mat-select-empty]': 'empty',
                          'class': 'mat-select',
                          '(keydown)': '_handleKeydown($event)',
                          '(focus)': '_onFocus()',
                          '(blur)': '_onBlur()',
                      },
                      animations: [
                          matSelectAnimations.transformPanelWrap,
                          matSelectAnimations.transformPanel
                      ],
                      providers: [
                          { provide: formField.MatFormFieldControl, useExisting: MatSelect },
                          { provide: core$1.MAT_OPTION_PARENT_COMPONENT, useExisting: MatSelect }
                      ],
                  },] },
      ];
      /** @nocollapse */
      MatSelect.ctorParameters = function () { return [
          { type: scrolling.ViewportRuler },
          { type: core.ChangeDetectorRef },
          { type: core.NgZone },
          { type: core$1.ErrorStateMatcher },
          { type: core.ElementRef },
          { type: bidi.Directionality, decorators: [{ type: core.Optional }] },
          { type: forms.NgForm, decorators: [{ type: core.Optional }] },
          { type: forms.FormGroupDirective, decorators: [{ type: core.Optional }] },
          { type: formField.MatFormField, decorators: [{ type: core.Optional }] },
          { type: forms.NgControl, decorators: [{ type: core.Self }, { type: core.Optional }] },
          { type: String, decorators: [{ type: core.Attribute, args: ['tabindex',] }] },
          { type: undefined, decorators: [{ type: core.Inject, args: [MAT_SELECT_SCROLL_STRATEGY,] }] },
          { type: a11y.LiveAnnouncer }
      ]; };
      MatSelect.propDecorators = {
          trigger: [{ type: core.ViewChild, args: ['trigger', { static: false },] }],
          panel: [{ type: core.ViewChild, args: ['panel', { static: false },] }],
          overlayDir: [{ type: core.ViewChild, args: [overlay.CdkConnectedOverlay, { static: false },] }],
          options: [{ type: core.ContentChildren, args: [core$1.MatOption, { descendants: true },] }],
          optionGroups: [{ type: core.ContentChildren, args: [core$1.MatOptgroup,] }],
          panelClass: [{ type: core.Input }],
          customTrigger: [{ type: core.ContentChild, args: [MatSelectTrigger, { static: false },] }],
          placeholder: [{ type: core.Input }],
          required: [{ type: core.Input }],
          multiple: [{ type: core.Input }],
          disableOptionCentering: [{ type: core.Input }],
          compareWith: [{ type: core.Input }],
          value: [{ type: core.Input }],
          ariaLabel: [{ type: core.Input, args: ['aria-label',] }],
          ariaLabelledby: [{ type: core.Input, args: ['aria-labelledby',] }],
          errorStateMatcher: [{ type: core.Input }],
          sortComparator: [{ type: core.Input }],
          id: [{ type: core.Input }],
          openedChange: [{ type: core.Output }],
          _openedStream: [{ type: core.Output, args: ['opened',] }],
          _closedStream: [{ type: core.Output, args: ['closed',] }],
          selectionChange: [{ type: core.Output }],
          valueChange: [{ type: core.Output }]
      };
      return MatSelect;
  }(_MatSelectMixinBase));
  
  /**
   * @fileoverview added by tsickle
   * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
   */
  var MatSelectModule = /** @class */ (function () {
      function MatSelectModule() {
      }
      MatSelectModule.decorators = [
          { type: core.NgModule, args: [{
                      imports: [
                          common.CommonModule,
                          overlay.OverlayModule,
                          core$1.MatOptionModule,
                          core$1.MatCommonModule,
                      ],
                      exports: [formField.MatFormFieldModule, MatSelect, MatSelectTrigger, core$1.MatOptionModule, core$1.MatCommonModule],
                      declarations: [MatSelect, MatSelectTrigger],
                      providers: [MAT_SELECT_SCROLL_STRATEGY_PROVIDER]
                  },] },
      ];
      return MatSelectModule;
  }());
  
  exports.MatSelectModule = MatSelectModule;
  exports.MAT_SELECT_SCROLL_STRATEGY_PROVIDER_FACTORY = MAT_SELECT_SCROLL_STRATEGY_PROVIDER_FACTORY;
  exports.SELECT_PANEL_MAX_HEIGHT = SELECT_PANEL_MAX_HEIGHT;
  exports.SELECT_PANEL_PADDING_X = SELECT_PANEL_PADDING_X;
  exports.SELECT_PANEL_INDENT_PADDING_X = SELECT_PANEL_INDENT_PADDING_X;
  exports.SELECT_ITEM_HEIGHT_EM = SELECT_ITEM_HEIGHT_EM;
  exports.SELECT_MULTIPLE_PANEL_PADDING_X = SELECT_MULTIPLE_PANEL_PADDING_X;
  exports.SELECT_PANEL_VIEWPORT_PADDING = SELECT_PANEL_VIEWPORT_PADDING;
  exports.MAT_SELECT_SCROLL_STRATEGY = MAT_SELECT_SCROLL_STRATEGY;
  exports.MAT_SELECT_SCROLL_STRATEGY_PROVIDER = MAT_SELECT_SCROLL_STRATEGY_PROVIDER;
  exports.MatSelectChange = MatSelectChange;
  exports.MatSelectTrigger = MatSelectTrigger;
  exports.MatSelect = MatSelect;
  exports.matSelectAnimations = matSelectAnimations;
  exports.transformPanel = transformPanel;
  exports.fadeInContent = fadeInContent;
  
  Object.defineProperty(exports, '__esModule', { value: true });
  
  })));
  //# sourceMappingURL=material-select.umd.js.map
  