tests: fix lint errors

Author: patrickhulce

lib/extend.ts

@@ -1,6 +1,7 @@
 import {Matcher, MatcherOptions, SelectorMatcherOptions} from 'dom-testing-library/typings' // tslint:disable-line no-submodule-imports
-import {getQueriesForElement, getDocument} from '.'
+import {getDocument, getQueriesForElement} from '.'
 
+// tslint:disable-next-line
 let Page, ElementHandle
 
 try {
@@ -10,6 +11,7 @@ try {
   Page.prototype.getDocument = getDocument
   getQueriesForElement(ElementHandle.prototype)
 } catch (err) {
+  // tslint:disable-next-line
   console.error('Could not augment puppeteer functions, do you have a conflicting version?')
   throw err
 }

lib/index.ts

@@ -109,7 +109,10 @@ export async function getDocument(_page?: Page): Promise<ElementHandle> {
   return document
 }
 
-export function wait(callback = () => {}, {timeout = 4500, interval = 50} = {}): Promise<{}> {
+export function wait(
+  callback: () => any = () => undefined,
+  {timeout = 4500, interval = 50} = {}, // tslint:disable-line
+): Promise<{}> {
   return waitForExpect(callback, timeout, interval)
 }