message: refactor(compiler): remove unused assertion function
  This code is no longer used now that ViewEngine has been removed.
  PR Close
diff: * found in the LICENSE file at https://angular.io/license
  */
  -export function assertArrayOfStrings(identifier: string, value: any) {
  - if (value == null) {
  - return;
  - }
  - if (!Array.isArray(value)) {
  - throw new Error(`Expected '${identifier}' to be an array of strings.`);
  - }
  - for (let i = 0; i < value.length; i += 1) {
  - if (typeof value[i] !== 'string') {
  - throw new Error(`Expected '${identifier}' to be an array of strings.`);
  - }
  - }
  -}
  -
  const UNUSABLE_INTERPOLATION_REGEXPS = [
  /^\s*$/, // empty
  /[<>]/, // html tag
  