Method locatorForOptional

src/cdk/testing/component-harness.ts:234–234

* Creates an asynchronous locator function that can be used to find a `ComponentHarness` instance * or element under the root element of this `LocatorFactory`. * * For example, given the following DOM and assuming `DivHarness.hostSelector` is `'div'` * * ```html * </di

(
    ...queries: T
  )

   *   result types for each query or null.
   */
  locatorForOptional<T extends (HarnessQuery<any> | string)[]>(
    ...queries: T
  ): () => Promise<LocatorFnResult<T> | null>;