fix(multiple): re-export collection util

Author: ok7sai

src/aria/accordion/accordion-group.ts

@@ -18,8 +18,7 @@ import {
   OnDestroy,
 } from '@angular/core';
 import {Directionality} from '@angular/cdk/bidi';
-import {AccordionGroupPattern} from '../private';
-import {SortedCollection} from '../private/utils/collection';
+import {AccordionGroupPattern, SortedCollection} from '../private';
 import {ACCORDION_GROUP} from './accordion-tokens';
 import {AccordionTrigger} from './accordion-trigger';
 

src/aria/listbox/listbox.ts

@@ -24,8 +24,7 @@ import {
 } from '@angular/core';
 import {Directionality} from '@angular/cdk/bidi';
 import {_IdGenerator} from '@angular/cdk/a11y';
-import {ComboboxListboxPattern, ListboxPattern} from '../private';
-import {SortedCollection} from '../private/utils/collection';
+import {ComboboxListboxPattern, ListboxPattern, SortedCollection} from '../private';
 import {ComboboxPopup} from '../combobox';
 import {Option} from './option';
 import {LISTBOX} from './tokens';

src/aria/private/public-api.ts

@@ -25,6 +25,7 @@ export * from './grid/row';
 export * from './grid/cell';
 export * from './grid/widget';
 export * from './deferred-content';
+export * from './utils/collection';
 export * from './utils/element';
 export * from './utils/element-resolver';
 export * from './simple-combobox/simple-combobox';

src/aria/tabs/tabs.ts

@@ -18,8 +18,7 @@ import {
 import {TabList} from './tab-list';
 import {TabPanel} from './tab-panel';
 import {TABS} from './tab-tokens';
-import {TabPanelPattern, TabPattern} from '../private';
-import {SortedCollection} from '../private/utils/collection';
+import {SortedCollection, TabPanelPattern, TabPattern} from '../private';
 
 /**
  * A Tabs container.