pull out stealth into util

util.js

@@ -12,3 +12,40 @@ const newStealthContext = async (browser, contextOptions = {}) => {
     };
   }
 };
+
+const stealth = async (context) => {
+  // stealth with playwright: https://github.com/berstend/puppeteer-extra/issues/454#issuecomment-917437212
+  // https://github.com/berstend/puppeteer-extra/tree/master/packages/puppeteer-extra-plugin-stealth/evasions
+  const enabledEvasions = [
+    'chrome.app',
+    'chrome.csi',
+    'chrome.loadTimes',
+    'chrome.runtime',
+    // 'defaultArgs',
+    'iframe.contentWindow',
+    'media.codecs',
+    'navigator.hardwareConcurrency',
+    'navigator.languages',
+    'navigator.permissions',
+    'navigator.plugins',
+    // 'navigator.vendor',
+    'navigator.webdriver',
+    'sourceurl',
+    // 'user-agent-override', // doesn't work since playwright has no page.browser()
+    'webgl.vendor',
+    'window.outerdimensions'
+  ];
+  const evasions = enabledEvasions.map(e => require(`puppeteer-extra-plugin-stealth/evasions/${e}`));
+  const stealth = {
+    callbacks: [],
+    async evaluateOnNewDocument(...args) {
+      this.callbacks.push({ cb: args[0], a: args[1] })
+    }
+  }
+  evasions.forEach(e => e().onPageCreated(stealth));
+  for (let evasion of stealth.callbacks) {
+    await context.addInitScript(evasion.cb, evasion.a);
+  }
+}
+
+module.exports = { stealth };