Switch to puppeteer-core so that Chromium doesn't get downloaded unti…

…l --dynamic is used the first time

lib/main.js

@@ -16,6 +16,23 @@ async function transferResults(jsHandle) {
   return results;
 }
 
+async function downloadAndLaunchHeadlessBrowser() {
+  const puppeteer = require('puppeteer-core');
+  const browserFetcher = puppeteer.createBrowserFetcher();
+  const preferredRevision = puppeteer._launcher._preferredRevision;
+  const localRevisions = await browserFetcher.localRevisions();
+  let revisionInfo;
+  if (localRevisions.includes(preferredRevision)) {
+    revisionInfo = await browserFetcher.revisionInfo(preferredRevision);
+  } else {
+    console.log(`Downloading Chromium ${preferredRevision}`);
+    revisionInfo = await browserFetcher.download(preferredRevision);
+  }
+  return await puppeteer.launch({
+    executablePath: revisionInfo.executablePath
+  });
+}
+
 async function tracePageInBrowser(browser, assetGraph, htmlAsset) {
   const page = await browser.newPage();
   await page.setRequestInterception(true);
@@ -281,7 +298,7 @@ module.exports = async (argv, console) => {
   let tracesByAsset;
   if (dynamic) {
     tracesByAsset = new Map();
-    const browser = await require('puppeteer').launch();
+    const browser = await downloadAndLaunchHeadlessBrowser();
     try {
       for (const htmlAsset of assetGraph.findAssets({
         type: 'Html',

package.json

@@ -53,6 +53,7 @@
     "lodash.groupby": "^4.6.0",
     "postcss-values-parser": "^2.0.1",
     "pretty-bytes": "^5.1.0",
+    "puppeteer-core": "^1.19.0",
     "urltools": "^0.4.1",
     "yargs": "^12.0.2"
   },
@@ -66,7 +67,6 @@
     "nyc": "^13.0.1",
     "prettier": "~1.18.2",
     "proxyquire": "^2.1.1",
-    "puppeteer": "^1.18.1",
     "sinon": "^6.1.5",
     "unexpected": "^10.39.1",
     "unexpected-set": "^2.0.0",

test/mocha.opts

@@ -1 +1 @@
---timeout 30000
+--timeout 300000