puppeteer does not support XPath, its a Selector. use a patch (fix #636)

src/puppet-web/bridge.ts

@@ -638,9 +638,35 @@ export class Bridge extends EventEmitter {
   public async clickSwitchAccount(): Promise<boolean> {
     log.verbose('PuppetWebBridge', 'clickSwitchAccount()')
 
-    const SELECTOR = `//div[contains(@class,'association') and contains(@class,'show')]/a[@ng-click='qrcodeLogin()']`
+    // https://github.com/GoogleChrome/puppeteer/issues/537#issuecomment-334918553
+    async function waitForXpath(page: Page, xpath: string) {
+      const resultsHandle = await (page as any).evaluateHandle(xpathInner => {
+        const results = [] as any
+        const query = document.evaluate(xpathInner, document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
+        for (let i = 0, length = query.snapshotLength; i < length; ++i) {
+          results.push(query.snapshotItem(i));
+        }
+        return results;
+      }, xpath);
+      const properties = await resultsHandle.getProperties();
+      const result = [] as any
+      const releasePromises = [] as any
+      for (const property of properties.values()) {
+        const element = property.asElement();
+        if (element)
+          result.push(element);
+        else
+          releasePromises.push(property.dispose());
+      }
+      await Promise.all(releasePromises);
+      return result;
+    }
+
+    const XPATH_SELECTOR = `//div[contains(@class,'association') and contains(@class,'show')]/a[@ng-click='qrcodeLogin()']`
+    // const DOM_
     try {
-      const button = await this.page.$(SELECTOR)
+      // const button = await this.page.$(XPATH_SELECTOR)
+      const [button] = await waitForXpath(this.page, XPATH_SELECTOR)
       await button.click()
       // const button = await this.driver.driver.findElement(By.xpath(
       //   "//div[contains(@class,'association') and contains(@class,'show')]/a[@ng-click='qrcodeLogin()']"))