code: function assertArrayOfStrings(identifier, value) {
      if (!__webpack_require__.i(__WEBPACK_IMPORTED_MODULE_0__angular_core__["t" /* isDevMode */])() || value == null) {
          return;
      }
      if (!Array.isArray(value)) {
          throw new Error("Expected '" + identifier + "' to be an array of strings.");
      }
      for (var /** @type {?} */ i = 0; i < value.length; i += 1) {
          if (typeof value[i] !== 'string') {
              throw new Error("Expected '" + identifier + "' to be an array of strings.");
          }
      }
  }
docs: @license
  Copyright Google Inc. 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
   
  @param {?} identifier
  @param {?} value
  @return {?}