diff --git a/install.js b/install.js
index a4da083f..3870985d 100644
--- a/install.js
+++ b/install.js
@@ -36,8 +36,10 @@ const revision = process.env.PUPPETEER_CHROMIUM_REVISION || process.env.npm_conf
 const revisionInfo = browserFetcher.revisionInfo(revision);
 
 // Do nothing if the revision is already downloaded.
-if (revisionInfo.local)
+if (revisionInfo.local) {
+  generateProtocolTypesIfNecessary(false /* updated */);
   return;
+}
 
 // Override current environment proxy settings with npm configuration, if any.
 const NPM_HTTPS_PROXY = process.env.npm_config_https_proxy || process.env.npm_config_proxy;
@@ -65,7 +67,7 @@ function onSuccess(localRevisions) {
   localRevisions = localRevisions.filter(revision => revision !== revisionInfo.revision);
   // Remove previous chromium revisions.
   const cleanupOldVersions = localRevisions.map(revision => browserFetcher.remove(revision));
-  return Promise.all(cleanupOldVersions);
+  return Promise.all([...cleanupOldVersions, generateProtocolTypesIfNecessary(true /* updated */)]);
 }
 
 /**
@@ -107,16 +109,31 @@ function buildNode6IfNecessary() {
   // folder.
   if (!fs.existsSync(path.join('utils', 'node6-transform')))
     return;
-  let asyncawait = true;
-  try {
-    new Function('async function test(){await 1}');
-  } catch (error) {
-    asyncawait = false;
-  }
   // if async/await is supported, then node6 is not needed.
-  if (asyncawait)
+  if (supportsAsyncAwait())
     return;
   // Re-build node6/ folder.
   console.log('Building Puppeteer for Node 6');
   require(path.join(__dirname, 'utils', 'node6-transform'));
 }
+
+function supportsAsyncAwait() {
+  try {
+    new Function('async function test(){await 1}');
+  } catch (error) {
+    return false;
+  }
+  return true;
+}
+
+function generateProtocolTypesIfNecessary(updated) {
+  if (!supportsAsyncAwait())
+    return;
+  const fs = require('fs');
+  const path = require('path');
+  if (!fs.existsSync(path.join(__dirname, 'utils', 'protocol-types-generator')))
+    return;
+  if (!updated && fs.existsSync(path.join(__dirname, 'lib', 'protocol.d.ts')))
+    return;
+  return require('./utils/protocol-types-generator');
+}
diff --git a/package.json b/package.json
index af7b44fd..6c2be60d 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "test-node6-transformer": "node utils/node6-transform/test/test.js",
     "build": "node utils/node6-transform/index.js",
     "unit-node6": "node node6/test/test.js",
-    "tsc": "node utils/protocol-types-generator && tsc -p .",
+    "tsc": "tsc -p .",
     "prepublishOnly": "npm run build",
     "apply-next-version": "node utils/apply_next_version.js"
   },
diff --git a/utils/protocol-types-generator/index.js b/utils/protocol-types-generator/index.js
index 94e73c67..3923cc24 100644
--- a/utils/protocol-types-generator/index.js
+++ b/utils/protocol-types-generator/index.js
@@ -1,6 +1,7 @@
 // @ts-check
+const path = require('path');
 const puppeteer = require('../..');
-puppeteer.launch({
+module.exports = puppeteer.launch({
   pipe: false,
   executablePath: process.env.CHROME,
   args: ['--no-sandbox', '--disable-dev-shm-usage']
@@ -9,6 +10,7 @@ puppeteer.launch({
   const page = await browser.newPage();
   await page.goto(`http://${origin}/json/protocol`);
   const json = JSON.parse(await page.evaluate(() => document.documentElement.innerText));
+  const version = await browser.version();
   await browser.close();
   const output = `// This is generated from /utils/protocol-types-generator/index.js
 declare global {
@@ -70,7 +72,9 @@ declare global {
 // empty export to keep file a module
 export {}
 `;
-  require('fs').writeFileSync(require('path').join(__dirname, '..', '..', 'lib', 'protocol.d.ts'), output);
+  const outputPath = path.join(__dirname, '..', '..', 'lib', 'protocol.d.ts');
+  require('fs').writeFileSync(outputPath, output);
+  console.log(`Wrote protocol.d.ts for ${version} to ${path.relative(process.cwd(), outputPath)}`);
 });