fixes Puppeteer evaluateHandle parameters (#39020)

types/puppeteer/index.d.ts

@@ -7,6 +7,7 @@
 //                 Serban Ghita <https://github.com/SerbanGhita>
 //                 Jason Kaczmarsky <https://github.com/JasonKaz>
 //                 Dave Cardwell <https://github.com/davecardwell>
+//                 Andrés Ortiz <https://github.com/angrykoala>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
 
@@ -242,10 +243,10 @@ export interface JSEvalable<A = any> {
      * @param args Arguments to pass to `fn`
      */
     evaluateHandle(
-      pageFunction: (arg1: A, ...args: any[]) => any,
+      pageFunction: string | ((arg1: A, ...args: any[]) => any),
       ...args: SerializableOrJSHandle[],
     ): Promise<JSHandle>;
-  }
+}
 
 /** Keyboard provides an api for managing a virtual keyboard. */
 export interface Keyboard {

types/puppeteer/puppeteer-tests.ts

@@ -309,6 +309,7 @@ puppeteer.launch().then(async browser => {
 
   // evaluateHandle example
   const aHandle = await page.evaluateHandle(() => document.body);
+  await page.evaluateHandle('document.body');
   const resultHandle = await page.evaluateHandle(body => body.innerHTML, aHandle);
   console.log(await resultHandle.jsonValue());
   await resultHandle.dispose();