.

Author: tinayuangao

src/lib/checkbox/checkbox.html

@@ -13,7 +13,7 @@
            [indeterminate]="indeterminate"
            [attr.aria-label]="ariaLabel"
            [attr.aria-labelledby]="ariaLabelledby"
-           [attr.aria-checked]="getAriaChecked()"
+           [attr.aria-checked]="_getAriaChecked()"
            (change)="_onInteractionEvent($event)"
            (click)="_onInputClick($event)">
     <div matRipple class="mat-checkbox-ripple"

src/lib/checkbox/checkbox.ts

@@ -303,7 +303,7 @@ export class MatCheckbox extends _MatCheckboxMixinBase implements ControlValueAc
     this._changeDetectorRef.markForCheck();
   }
 
-  getAriaChecked(): string {
+  _getAriaChecked(): 'true'|'false'|'mixed' {
     return this.checked ? 'true' : (this.indeterminate ? 'mixed' : 'false');
   }