build: allow to customize tmpdir

docs/api.md

@@ -465,6 +465,7 @@ If Puppeteer doesn't find them in the environment during the installation step,
 
 - `HTTP_PROXY`, `HTTPS_PROXY`, `NO_PROXY` - defines HTTP proxy settings that are used to download and run the browser.
 - `PUPPETEER_SKIP_CHROMIUM_DOWNLOAD` - do not download bundled Chromium during installation step.
+- `PUPPETEER_TMP_DIR` - defines the directory to be used by Puppeteer for creating temporary files. Defaults to [`os.tmpdir()`](https://nodejs.org/api/os.html#os_os_tmpdir).
 - `PUPPETEER_DOWNLOAD_HOST` - overwrite URL prefix that is used to download Chromium. Note: this includes protocol and might even include path prefix. Defaults to `https://storage.googleapis.com`.
 - `PUPPETEER_DOWNLOAD_PATH` - overwrite the path for the downloads folder. Defaults to `<root>/.local-chromium`, where `<root>` is Puppeteer's package root.
 - `PUPPETEER_CHROMIUM_REVISION` - specify a certain version of Chromium you'd like Puppeteer to use. See [puppeteer.launch([options])](#puppeteerlaunchoptions) on how executable path is inferred. **BEWARE**: Puppeteer is only [guaranteed to work](https://github.com/puppeteer/puppeteer/#q-why-doesnt-puppeteer-vxxx-work-with-chromium-vyyy) with the bundled Chromium, use at your own risk.

experimental/puppeteer-firefox/lib/Launcher.js

@@ -30,7 +30,9 @@ const WebSocketTransport = require('./WebSocketTransport');
 const mkdtempAsync = util.promisify(fs.mkdtemp);
 const removeFolderAsync = util.promisify(removeFolder);
 
-const FIREFOX_PROFILE_PATH = path.join(os.tmpdir(), 'puppeteer_firefox_profile-');
+const tmpDir = () => process.env.PUPPETEER_TMP_DIR || os.tmpdir();
+
+const FIREFOX_PROFILE_PATH = path.join(tmpDir(), 'puppeteer_firefox_profile-');
 
 const DEFAULT_ARGS = [
   '-no-remote',

src/node/Launcher.ts

@@ -31,8 +31,11 @@ import {
   ChromeReleaseChannel,
   PuppeteerNodeLaunchOptions,
 } from './LaunchOptions.js';
+
 import { Product } from '../common/Product.js';
 
+const tmpDir = () => process.env.PUPPETEER_TMP_DIR || os.tmpdir();
+
 /**
  * Describes a launcher - a class that is able to create and launch a browser instance.
  * @public
@@ -81,7 +84,7 @@ class ChromeLauncher implements ProductLauncher {
       waitForInitialPage = true,
     } = options;
 
-    const profilePath = path.join(os.tmpdir(), 'puppeteer_dev_chrome_profile-');
+    const profilePath = path.join(tmpDir(), 'puppeteer_dev_chrome_profile-');
     const chromeArguments = [];
     if (!ignoreDefaultArgs) chromeArguments.push(...this.defaultArgs(options));
     else if (Array.isArray(ignoreDefaultArgs))
@@ -385,7 +388,7 @@ class FirefoxLauncher implements ProductLauncher {
 
   async _createProfile(extraPrefs: { [x: string]: unknown }): Promise<string> {
     const profilePath = await mkdtempAsync(
-      path.join(os.tmpdir(), 'puppeteer_dev_firefox_profile-')
+      path.join(tmpDir(), 'puppeteer_dev_firefox_profile-')
     );
     const prefsJS = [];
     const userJS = [];