chore: Run perf tests in CI (#847)

* Change CircleCI image to contain Chrome

* Run `yarn perf` in CI

Author: miroslavstastny

.circleci/config.yml

@@ -6,7 +6,7 @@ general:
 jobs:
   build:
     docker:
-      - image: circleci/node:8
+      - image: circleci/node:8-browsers
     environment:
       TZ: "/usr/share/zoneinfo/America/Los_Angeles"
     steps:
@@ -83,6 +83,9 @@ jobs:
             else
               echo "STATS_URI not set, skipping"
             fi
+      - run:
+          name: Performance Tests
+          command: yarn perf
       - run:
           name: Danger JS
           command: |

build/gulp/tasks/perf.ts

@@ -86,7 +86,9 @@ task('perf:run', async () => {
   let browser
 
   try {
-    browser = await puppeteer.launch()
+    browser = await puppeteer.launch({
+      args: ['--single-process'], // Workaround for newPage hang in CircleCI: https://github.com/GoogleChrome/puppeteer/issues/1409#issuecomment-453845568
+    })
 
     for (let i = 0; i < times; i++) {
       const page = await browser.newPage()