no longer need duplicate expect declaration

Author: bahmutov

examples/preprocessors__typescript-webpack/cypress/integration/spec.ts

@@ -1,8 +1,5 @@
 import { add } from '../support/add'
 
-// brings type definition from @types/chai
-declare const expect: Chai.ExpectStatic
-
 describe('TypeScript', () => {
   it('works', () => {
     // note TypeScript definition