fix: support older puppeteer versions

Author: patrickhulce

lib/extend.ts

@@ -16,19 +16,23 @@ try {
   if (Page.Page) Page = Page.Page
 
   ElementHandle = requireOrUndefined('puppeteer/lib/ElementHandle.js') // tslint:disable-line variable-name
+  if (ElementHandle && ElementHandle.ElementHandle) ElementHandle = ElementHandle.ElementHandle
+
   if (!ElementHandle) {
     const ExecutionContext = requireOrUndefined('puppeteer/lib/ExecutionContext.js') // tslint:disable-line variable-name
     if (ExecutionContext && ExecutionContext.ElementHandle) {
       ElementHandle = ExecutionContext.ElementHandle
     }
   }
+  if (ElementHandle && ElementHandle.ElementHandle) ElementHandle = ElementHandle.ElementHandle
 
   if (!ElementHandle) {
     const JSHandle = require('puppeteer/lib/JSHandle.js') // tslint:disable-line
     if (JSHandle && JSHandle.ElementHandle) {
       ElementHandle = JSHandle.ElementHandle
     }
   }
+  if (ElementHandle && ElementHandle.ElementHandle) ElementHandle = ElementHandle.ElementHandle
 
   Page.prototype.getDocument = getDocument
   getQueriesForElement(ElementHandle.prototype, function(this: ElementHandle): ElementHandle {

test/extend.test.ts

@@ -1,12 +1,15 @@
 import * as path from 'path'
 import * as puppeteer from 'puppeteer'
-import '../lib/extend'
 
 describe('lib/extend.ts', () => {
   let browser: puppeteer.Browser
   let page: puppeteer.Page
   let document: puppeteer.ElementHandle
 
+  it('should require without error', async () => {
+    await import('../lib/extend')
+  })
+
   it('should launch puppeteer', async () => {
     browser = await puppeteer.launch({args: ['--no-sandbox', '--disable-setuid-sandbox']})
     page = await browser.newPage()