fix(platform) instanceof bug between execution contexts of RegExp object (#1048)

First encountered at jest-playwright repo:
https://github.com/mmarkelov/jest-playwright/issues/38

Solution based on:
https://stackoverflow.com/questions/4339288/typeof-for-regexp#comment4724685_4339350

src/helper.ts

@@ -98,6 +98,10 @@ class Helper {
     return typeof obj === 'number' || obj instanceof Number;
   }
 
+  static isRegExp(obj: any): obj is RegExp {
+    return obj instanceof RegExp || Object.prototype.toString.call(obj) === '[object RegExp]';
+  }
+
   static isObject(obj: any): obj is NonNullable<object> {
     return typeof obj === 'object' && obj !== null;
   }

src/page.ts

@@ -358,7 +358,7 @@ export class Page extends platform.EventEmitter {
   async waitForRequest(urlOrPredicate: string | RegExp | ((r: network.Request) => boolean), options: types.TimeoutOptions = {}): Promise<network.Request> {
     const { timeout = this._timeoutSettings.timeout() } = options;
     return helper.waitForEvent(this, Events.Page.Request, (request: network.Request) => {
-      if (helper.isString(urlOrPredicate) || urlOrPredicate instanceof RegExp)
+      if (helper.isString(urlOrPredicate) || helper.isRegExp(urlOrPredicate))
         return platform.urlMatches(request.url(), urlOrPredicate);
       return urlOrPredicate(request);
     }, timeout, this._disconnectedPromise);
@@ -367,7 +367,7 @@ export class Page extends platform.EventEmitter {
   async waitForResponse(urlOrPredicate: string | RegExp | ((r: network.Response) => boolean), options: types.TimeoutOptions = {}): Promise<network.Response> {
     const { timeout = this._timeoutSettings.timeout() } = options;
     return helper.waitForEvent(this, Events.Page.Response, (response: network.Response) => {
-      if (helper.isString(urlOrPredicate) || urlOrPredicate instanceof RegExp)
+      if (helper.isString(urlOrPredicate) || helper.isRegExp(urlOrPredicate))
         return platform.urlMatches(response.url(), urlOrPredicate);
       return urlOrPredicate(response);
     }, timeout, this._disconnectedPromise);

src/platform.ts

@@ -222,7 +222,7 @@ export function urlMatches(urlString: string, match: types.URLMatch | undefined)
     return true;
   if (helper.isString(match))
     match = helper.globToRegex(match);
-  if (match instanceof RegExp)
+  if (helper.isRegExp(match))
     return match.test(urlString);
   if (typeof match === 'string' && match === urlString)
     return true;

test/interception.spec.js

@@ -19,6 +19,7 @@ const fs = require('fs');
 const path = require('path');
 const { helper } = require('../lib/helper');
 const utils = require('./utils');
+const vm = require('vm');
 
 /**
  * @type {PageTestSuite}
@@ -618,6 +619,28 @@ module.exports.describe = function({testRunner, expect, defaultBrowserOptions, p
       expect(helper.globToRegex('**/*.{png,jpg,jpeg}').test('https://localhost:8080/c.css')).toBeFalsy();
     });
   });
+
+  describe('regexp', function() {
+    it('should work with regular expression passed from a different context', async({page, server}) => {
+      const ctx = vm.createContext();
+      const regexp = vm.runInContext('new RegExp("empty\\.html")', ctx);
+
+      await page.route(regexp, request => {
+        expect(request.url()).toContain('empty.html');
+        expect(request.headers()['user-agent']).toBeTruthy();
+        expect(request.method()).toBe('GET');
+        expect(request.postData()).toBe(undefined);
+        expect(request.isNavigationRequest()).toBe(true);
+        expect(request.resourceType()).toBe('document');
+        expect(request.frame() === page.mainFrame()).toBe(true);
+        expect(request.frame().url()).toBe('about:blank');
+        request.continue();
+      });
+
+      const response = await page.goto(server.EMPTY_PAGE);
+      expect(response.ok()).toBe(true);
+    });
+  });
 };
 
 /**

test/page.spec.js

@@ -18,6 +18,7 @@ const fs = require('fs');
 const path = require('path');
 const utils = require('./utils');
 const {waitEvent} = utils;
+const vm = require('vm');
 
 /**
  * @type {PageTestSuite}
@@ -309,6 +310,19 @@ module.exports.describe = function({testRunner, expect, headless, playwright, FF
       ]);
       expect(request.url()).toBe(server.PREFIX + '/digits/1.png');
     });
+    it('should work with url match regular expression from a different context', async({page, server}) => {
+      const ctx = vm.createContext();
+      const regexp = vm.runInContext('new RegExp(/digits\\/\\d\\.png/)', ctx);
+
+      await page.goto(server.EMPTY_PAGE);
+      const [request] = await Promise.all([
+        page.waitForRequest(regexp),
+        page.evaluate(() => {
+          fetch('/digits/1.png');
+        })
+      ]);
+      expect(request.url()).toBe(server.PREFIX + '/digits/1.png');
+    });
   });
 
   describe('Page.waitForResponse', function() {