Rename engine -> browserType.

README.md

@@ -39,15 +39,15 @@ Playwright can be used to create a browser instance, open pages, and then manipu
 This code snippet navigates to whatsmyuseragent.org in Chromium, Firefox and WebKit, and saves 3 screenshots.
 
 ```js
-const pw = require('playwright');
+const playwright = require('playwright');
 
 (async () => {
-  for (const name of ['chromium', 'firefox', 'webkit']) {
+  for (const browserType of ['chromium', 'firefox', 'webkit']) {
-    const browser = await pw[name].launch();
+    const browser = await playwright[browserType].launch();
     const context = await browser.newContext();
     const page = await context.newPage('http://whatsmyuseragent.org/');
 
-    await page.screenshot({ path: `example-${name}.png` });
+    await page.screenshot({ path: `example-${browserType}.png` });
     await browser.close();
   }
 })();
@@ -58,11 +58,11 @@ const pw = require('playwright');
 This snippet emulates Mobile Safari on a device at a given geolocation, navigates to maps.google.com, performs action and takes a screenshot.
 
 ```js
-const pw = require('playwright');
+const { webkit, devices } = require('playwright');
-const iPhone11 = pw.devices['iPhone 11 Pro'];
+const iPhone11 = devices['iPhone 11 Pro'];
 
 (async () => {
-  const browser = await pw.webkit.launch();
+  const browser = await webkit.launch();
   const context = await browser.newContext({
     viewport: iPhone11.viewport,
     userAgent: iPhone11.userAgent,
@@ -81,11 +81,11 @@ const iPhone11 = pw.devices['iPhone 11 Pro'];
 And here is the same script for Chrome on Android.
 
 ```js
-const pw = require('playwright');
+const { chromium, devices } = require('playwright');
-const pixel2 = pw.devices['Pixel 2'];
+const pixel2 = devices['Pixel 2'];
 
 (async () => {
-  const browser = await pw.chromium.launch();
+  const browser = await chromium.launch();
   const context = await browser.newContext({
     viewport: pixel2.viewport,
     userAgent: pixel2.userAgent,
@@ -106,10 +106,10 @@ const pixel2 = pw.devices['Pixel 2'];
 This code snippet navigates to example.com in Firefox, and executes a script in the page context.
 
 ```js
-const pw = require('playwright');
+const { firefox } = require('playwright');
 
 (async () => {
-  const browser = await pw.firefox.launch(); // or 'chromium', 'webkit'
+  const browser = await firefox.launch();
   const context = await browser.newContext();
   const page = await context.newPage();
 

docs/api.md

@@ -5,7 +5,8 @@
 ##### Table of Contents
 
 <!-- GEN:toc-top-level -->
-- [class: Playwright](#class-playwright)
+- [Playwright module](#playwright-module)
+- [class: BrowserType](#class-browsertype)
 - [class: Browser](#class-browser)
 - [class: BrowserApp](#class-browserapp)
 - [class: BrowserContext](#class-browsercontext)
@@ -34,15 +35,15 @@
 - [Downloaded browsers](#downloaded-browsers)
 <!-- GEN:stop -->
 
-### class: Playwright
+### Playwright module
 
 Playwright module provides a method to launch a browser instance.
 The following is a typical example of using Playwright to drive automation:
 ```js
-const playwright = require('playwright').chromium;  // Or 'firefox' or 'webkit'.
+const { chromium, firefox, webkit } = require('playwright');
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await chromium.launch();  // Or 'firefox' or 'webkit'.
   const context = await browser.newContext();
   const page = await context.newPage('http://example.com');
   // other actions...
@@ -53,34 +54,17 @@ const playwright = require('playwright').chromium;  // Or 'firefox' or 'webkit'.
 Playwright automatically downloads browser executables during installation, see [Downloaded browsers](#downloaded-browsers) for more information.
 
 <!-- GEN:toc -->
-- [playwright.connect(options)](#playwrightconnectoptions)
+- [playwright.chromium](#playwrightchromium)
-- [playwright.defaultArgs([options])](#playwrightdefaultargsoptions)
 - [playwright.devices](#playwrightdevices)
 - [playwright.errors](#playwrighterrors)
-- [playwright.executablePath()](#playwrightexecutablepath)
+- [playwright.firefox](#playwrightfirefox)
-- [playwright.launch([options])](#playwrightlaunchoptions)
+- [playwright.webkit](#playwrightwebkit)
-- [playwright.launchBrowserApp([options])](#playwrightlaunchbrowserappoptions)
 <!-- GEN:stop -->
 
-#### playwright.connect(options)
+#### playwright.chromium
-- `options` <[Object]>
+- returns: <[BrowserType]>
-  - `browserWSEndpoint` <?[string]> A browser websocket endpoint to connect to.
-  - `slowMo` <[number]> Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on.
-  - `browserURL` <?[string]> **Chromium-only** A browser url to connect to, in format `http://${host}:${port}`. Use interchangeably with `browserWSEndpoint` to let Playwright fetch it from [metadata endpoint](https://chromedevtools.github.io/devtools-protocol/#how-do-i-access-the-browser-target).
-  - `transport` <[ConnectionTransport]> **Experimental** Specify a custom transport object for Playwright to use.
-- returns: <[Promise]<[Browser]>>
 
-This methods attaches Playwright to an existing browser instance.
+This object can be used to launch or connect to Chromium, returning instances of [ChromiumBrowser].
-
-#### playwright.defaultArgs([options])
-- `options` <[Object]>  Set of configurable options to set on the browser. Can have the following fields:
-  - `headless` <[boolean]> Whether to run browser in headless mode. More details for [Chromium](https://developers.google.com/web/updates/2017/04/headless-chrome) and [Firefox](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode). Defaults to `true` unless the `devtools` option is `true`.
-  - `args` <[Array]<[string]>> Additional arguments to pass to the browser instance. The list of Chromium flags can be found [here](http://peter.sh/experiments/chromium-command-line-switches/).
-  - `userDataDir` <[string]> Path to a [User Data Directory](https://chromium.googlesource.com/chromium/src/+/master/docs/user_data_dir.md).
-  - `devtools` <[boolean]> **Chromium-only** Whether to auto-open a Developer Tools panel for each tab. If this option is `true`, the `headless` option will be set `false`.
-- returns: <[Array]<[string]>>
-
-The default flags that browser will be launched with.
 
 #### playwright.devices
 - returns: <[Object]>
@@ -89,11 +73,11 @@ Returns a list of devices to be used with [`page.emulate(options)`](#pageemulate
 devices can be found in [src/deviceDescriptors.ts](https://github.com/Microsoft/playwright/blob/master/src/deviceDescriptors.ts).
 
 ```js
-const playwright = require('playwright').firefox;  // Or 'chromium' or 'webkit'.
+const { webkit, devices } = require('playwright');
-const iPhone = playwright.devices['iPhone 6'];
+const iPhone = devices['iPhone 6'];
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await webkit.launch();
   const context = await browser.newContext({
     viewport: iPhone.viewport,
     userAgent: iPhone.userAgent
@@ -112,7 +96,7 @@ Playwright methods might throw errors if they are unable to fulfill a request. F
 might fail if the selector doesn't match any nodes during the given timeframe.
 
 For certain types of errors Playwright uses specific error classes.
-These classes are available via [`playwright.errors`](#playwrighterrors).
+These classes are available via [`browserType.errors`](#browsertypeerrors) or [`playwright.errors`](#playwrighterrors).
 
 An example of handling a timeout error:
 ```js
@@ -125,16 +109,116 @@ try {
 }
 ```
 
-#### playwright.executablePath()
+#### playwright.firefox
+- returns: <[BrowserType]>
+
+This object can be used to launch or connect to Firefox, returning instances of [FirefoxBrowser].
+
+#### playwright.webkit
+- returns: <[BrowserType]>
+
+This object can be used to launch or connect to WebKit, returning instances of [WebKitBrowser].
+
+### class: BrowserType
+
+BrowserType provides methods to launch a specific browser instance or connect to an existing one.
+The following is a typical example of using Playwright to drive automation:
+```js
+const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.
+
+(async () => {
+  const browser = await chromium.launch();
+  const context = await browser.newContext();
+  const page = await context.newPage('http://example.com');
+  // other actions...
+  await browser.close();
+})();
+```
+
+<!-- GEN:toc -->
+- [browserType.connect(options)](#browsertypeconnectoptions)
+- [browserType.defaultArgs([options])](#browsertypedefaultargsoptions)
+- [browserType.devices](#browsertypedevices)
+- [browserType.errors](#browsertypeerrors)
+- [browserType.executablePath()](#browsertypeexecutablepath)
+- [browserType.launch([options])](#browsertypelaunchoptions)
+- [browserType.launchBrowserApp([options])](#browsertypelaunchbrowserappoptions)
+<!-- GEN:stop -->
+
+#### browserType.connect(options)
+- `options` <[Object]>
+  - `browserWSEndpoint` <?[string]> A browser websocket endpoint to connect to.
+  - `slowMo` <[number]> Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on.
+  - `browserURL` <?[string]> **Chromium-only** A browser url to connect to, in format `http://${host}:${port}`. Use interchangeably with `browserWSEndpoint` to let Playwright fetch it from [metadata endpoint](https://chromedevtools.github.io/devtools-protocol/#how-do-i-access-the-browser-target).
+  - `transport` <[ConnectionTransport]> **Experimental** Specify a custom transport object for Playwright to use.
+- returns: <[Promise]<[Browser]>>
+
+This methods attaches Playwright to an existing browser instance.
+
+#### browserType.defaultArgs([options])
+- `options` <[Object]>  Set of configurable options to set on the browser. Can have the following fields:
+  - `headless` <[boolean]> Whether to run browser in headless mode. More details for [Chromium](https://developers.google.com/web/updates/2017/04/headless-chrome) and [Firefox](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode). Defaults to `true` unless the `devtools` option is `true`.
+  - `args` <[Array]<[string]>> Additional arguments to pass to the browser instance. The list of Chromium flags can be found [here](http://peter.sh/experiments/chromium-command-line-switches/).
+  - `userDataDir` <[string]> Path to a [User Data Directory](https://chromium.googlesource.com/chromium/src/+/master/docs/user_data_dir.md).
+  - `devtools` <[boolean]> **Chromium-only** Whether to auto-open a Developer Tools panel for each tab. If this option is `true`, the `headless` option will be set `false`.
+- returns: <[Array]<[string]>>
+
+The default flags that browser will be launched with.
+
+#### browserType.devices
+- returns: <[Object]>
+
+Returns a list of devices to be used with [`page.emulate(options)`](#pageemulateoptions). Actual list of
+devices can be found in [src/deviceDescriptors.ts](https://github.com/Microsoft/playwright/blob/master/src/deviceDescriptors.ts).
+
+```js
+const { webkit } = require('playwright');
+const iPhone = webkit.devices['iPhone 6'];
+
+(async () => {
+  const browser = await webkit.launch();
+  const context = await browser.newContext({
+    viewport: iPhone.viewport,
+    userAgent: iPhone.userAgent
+  });
+  const page = await context.newPage('http://example.com');
+  // other actions...
+  await browser.close();
+})();
+```
+
+#### browserType.errors
+- returns: <[Object]>
+  - `TimeoutError` <[function]> A class of [TimeoutError].
+
+Playwright methods might throw errors if they are unable to fulfill a request. For example, [page.waitForSelector(selector[, options])](#pagewaitforselectorselector-options)
+might fail if the selector doesn't match any nodes during the given timeframe.
+
+For certain types of errors Playwright uses specific error classes.
+These classes are available via [`browserType.errors`](#browsertypeerrors) or [`playwright.errors`](#playwrighterrors).
+
+An example of handling a timeout error:
+```js
+const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.
+try {
+  await page.waitForSelector('.foo');
+} catch (e) {
+  if (e instanceof webkit.errors.TimeoutError) {
+    // Do something if this is a timeout.
+  }
+}
+```
+
+#### browserType.executablePath()
 - returns: <[string]> A path where Playwright expects to find a bundled browser.
 
-#### playwright.launch([options])
+#### browserType.launch([options])
 - `options` <[Object]>  Set of configurable options to set on the browser. Can have the following fields:
   - `headless` <[boolean]> Whether to run browser in headless mode. More details for [Chromium](https://developers.google.com/web/updates/2017/04/headless-chrome) and [Firefox](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode). Defaults to `true` unless the `devtools` option is `true`.
   - `executablePath` <[string]> Path to a browser executable to run instead of the bundled one. If `executablePath` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd). **BEWARE**: Playwright is only [guaranteed to work](https://github.com/Microsoft/playwright/#q-why-doesnt-playwright-vxxx-work-with-chromium-vyyy) with the bundled Chromium, Firefox or WebKit, use at your own risk.
   - `slowMo` <[number]> Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on.
   - `args` <[Array]<[string]>> Additional arguments to pass to the browser instance. The list of Chromium flags can be found [here](http://peter.sh/experiments/chromium-command-line-switches/).
-  - `ignoreDefaultArgs` <[boolean]|[Array]<[string]>> If `true`, then do not use [`playwright.defaultArgs()`](#playwrightdefaultargsoptions). If an array is given, then filter out the given default arguments. Dangerous option; use with care. Defaults to `false`.
+  - `ignoreDefaultArgs` <[boolean]|[Array]<[string]>> If `true`, then do not use [`browserType.defaultArgs()`](#browsertypedefaultargsoptions). If an array is given, then filter out the given default arguments. Dangerous option; use with care. Defaults to `false`.
   - `handleSIGINT` <[boolean]> Close the browser process on Ctrl-C. Defaults to `true`.
   - `handleSIGTERM` <[boolean]> Close the browser process on SIGTERM. Defaults to `true`.
   - `handleSIGHUP` <[boolean]> Close the browser process on SIGHUP. Defaults to `true`.
@@ -149,7 +233,7 @@ try {
 
 You can use `ignoreDefaultArgs` to filter out `--mute-audio` from default arguments:
 ```js
-const browser = await playwright.launch({
+const browser = await chromium.launch({  // Or 'firefox' or 'webkit'.
   ignoreDefaultArgs: ['--mute-audio']
 });
 ```
@@ -158,17 +242,17 @@ const browser = await playwright.launch({
 >
 > If Google Chrome (rather than Chromium) is preferred, a [Chrome Canary](https://www.google.com/chrome/browser/canary.html) or [Dev Channel](https://www.chromium.org/getting-involved/dev-channel) build is suggested.
 >
-> In [playwright.launch([options])](#playwrightlaunchoptions) above, any mention of Chromium also applies to Chrome.
+> In [browserType.launch([options])](#browsertypelaunchoptions) above, any mention of Chromium also applies to Chrome.
 >
 > See [`this article`](https://www.howtogeek.com/202825/what%E2%80%99s-the-difference-between-chromium-and-chrome/) for a description of the differences between Chromium and Chrome. [`This article`](https://chromium.googlesource.com/chromium/src/+/lkgr/docs/chromium_browser_vs_google_chrome.md) describes some differences for Linux users.
 
-#### playwright.launchBrowserApp([options])
+#### browserType.launchBrowserApp([options])
 - `options` <[Object]>  Set of configurable options to set on the browser. Can have the following fields:
   - `headless` <[boolean]> Whether to run browser in headless mode. More details for [Chromium](https://developers.google.com/web/updates/2017/04/headless-chrome) and [Firefox](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode). Defaults to `true` unless the `devtools` option is `true`.
   - `executablePath` <[string]> Path to a browser executable to run instead of the bundled one. If `executablePath` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd). **BEWARE**: Playwright is only [guaranteed to work](https://github.com/Microsoft/playwright/#q-why-doesnt-playwright-vxxx-work-with-chromium-vyyy) with the bundled Chromium, Firefox or WebKit, use at your own risk.
   - `slowMo` <[number]> Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on.
   - `args` <[Array]<[string]>> Additional arguments to pass to the browser instance. The list of Chromium flags can be found [here](http://peter.sh/experiments/chromium-command-line-switches/).
-  - `ignoreDefaultArgs` <[boolean]|[Array]<[string]>> If `true`, then do not use [`playwright.defaultArgs()`](#playwrightdefaultargsoptions). If an array is given, then filter out the given default arguments. Dangerous option; use with care. Defaults to `false`.
+  - `ignoreDefaultArgs` <[boolean]|[Array]<[string]>> If `true`, then do not use [`browserType.defaultArgs()`](#browsertypedefaultargsoptions). If an array is given, then filter out the given default arguments. Dangerous option; use with care. Defaults to `false`.
   - `handleSIGINT` <[boolean]> Close the browser process on Ctrl-C. Defaults to `true`.
   - `handleSIGTERM` <[boolean]> Close the browser process on SIGTERM. Defaults to `true`.
   - `handleSIGHUP` <[boolean]> Close the browser process on SIGHUP. Defaults to `true`.
@@ -184,14 +268,14 @@ const browser = await playwright.launch({
 
 * extends: [EventEmitter](https://nodejs.org/api/events.html#events_class_eventemitter)
 
-A Browser is created when Playwright connects to a browser instance, either through [`playwright.launch`](#playwrightlaunchoptions) or [`playwright.connect`](#playwrightconnectoptions).
+A Browser is created when Playwright connects to a browser instance, either through [`browserType.launch`](#browsertypelaunchoptions) or [`browserType.connect`](#browsertypeconnectoptions).
 
 An example of using a [Browser] to create a [Page]:
 ```js
-const playwright = require('playwright').firefox;  // Or 'chromium' or 'webkit'.
+const { firefox } = require('playwright');  // Or 'chromium' or 'webkit'.
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await firefox.launch();
   const context = await browser.newContext();
   const page = await context.newPage('https://example.com');
   await browser.close();
@@ -200,19 +284,19 @@ const playwright = require('playwright').firefox;  // Or 'chromium' or 'webkit'.
 
 An example of launching a browser executable and connecting to a [Browser] later:
 ```js
-const playwright = require('playwright').webkit;  // Or 'chromium' or 'firefox'.
+const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.
 
 (async () => {
-  const browserApp = await playwright.launchBrowserApp({ webSocket: true });
+  const browserApp = await webkit.launchBrowserApp({ webSocket: true });
   const connectOptions = browserApp.connectOptions();
   // Use connect options later to establish a connection.
-  const browser = await playwright.connect(connectOptions);
+  const browser = await webkit.connect(connectOptions);
   // Close browser instance.
   await browserApp.close();
 })();
 ```
 
-See [ChromiumBrowser], [FirefoxBrowser] and [WebKitBrowser] for browser-specific features. Note that [playwright.connect(options)](#playwrightconnectoptions) and [playwright.launch(options)](#playwrightlaunchoptions) always return a specific browser instance, based on the browser being connected to or launched.
+See [ChromiumBrowser], [FirefoxBrowser] and [WebKitBrowser] for browser-specific features. Note that [browserType.connect(options)](#browsertypeconnectoptions) and [browserType.launch(options)](#browsertypelaunchoptions) always return a specific browser instance, based on the browser being connected to or launched.
 
 <!-- GEN:toc -->
 - [event: 'disconnected'](#event-disconnected)
@@ -225,9 +309,9 @@ See [ChromiumBrowser], [FirefoxBrowser] and [WebKitBrowser] for browser-specific
 <!-- GEN:stop -->
 
 #### event: 'disconnected'
-Emitted when Playwright gets disconnected from the browser instance. This might happen because of one of the following:
+Emitted when Browser gets disconnected from the browser application. This might happen because of one of the following:
-- Browser is closed or crashed
+- Browser application is closed or crashed.
-- The [`browser.disconnect`](#browserdisconnect) method was called
+- The [`browser.disconnect`](#browserdisconnect) method was called.
 
 #### browser.browserContexts()
 - returns: <[Array]<[BrowserContext]>>
@@ -248,7 +332,7 @@ Returns the default browser context. The default browser context can not be clos
 #### browser.disconnect()
 - returns: <[Promise]>
 
-Disconnects Playwright from the browser, but leaves the browser process running. After calling `disconnect`, the [Browser] object is considered disposed and cannot be used anymore.
+Disconnects Browser from the browser application, but leaves the application process running. After calling `disconnect`, the [Browser] object is considered disposed and cannot be used anymore.
 
 #### browser.isConnected()
 
@@ -279,7 +363,7 @@ Creates a new browser context. It won't share cookies/cache with other browser c
 
 ```js
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await playwright.firefox.launch();  // Or 'chromium' or 'webkit'.
   // Create a new incognito browser context.
   const context = await browser.newContext();
   // Create a new page in a pristine context.
@@ -307,7 +391,7 @@ Closes the browser gracefully and makes sure the process is terminated.
   - `slowMo` <[number]>
   - `transport` <[ConnectionTransport]> **Experimental** A custom transport object which should be used to connect.
 
-This options object can be passed to [playwright.connect(options)](#playwrightconnectoptions) to establish connection to the browser.
+This options object can be passed to [browserType.connect(options)](#browsertypeconnectoptions) to establish connection to the browser.
 
 #### browserApp.process()
 - returns: <?[ChildProcess]> Spawned browser application process.
@@ -315,7 +399,7 @@ This options object can be passed to [playwright.connect(options)](#playwrightco
 #### browserApp.wsEndpoint()
 - returns: <?[string]> Browser websocket url.
 
-Browser websocket endpoint which can be used as an argument to [playwright.connect(options)] to establish connection to the browser.
+Browser websocket endpoint which can be used as an argument to [browserType.connect(options)] to establish connection to the browser.
 
 ### class: BrowserContext
 
@@ -498,10 +582,10 @@ One of the following values: `'log'`, `'debug'`, `'info'`, `'error'`, `'warning'
 
 An example of using `Dialog` class:
 ```js
-const playwright = require('playwright').chromium;  // Or 'firefox' or 'webkit'.
+const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await chromium.launch();
   const context = await browser.newContext();
   const page = await context.newPage();
   page.on('dialog', async dialog => {
@@ -543,10 +627,10 @@ const playwright = require('playwright').chromium;  // Or 'firefox' or 'webkit'.
 ElementHandle represents an in-page DOM element. ElementHandles can be created with the [page.$](#pageselector) method.
 
 ```js
-const playwright = require('playwright').chromium;  // Or 'firefox' or 'webkit'.
+const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await chromium.launch();
   const context = await browser.newContext();
   const page = await context.newPage('https://example.com');
   const hrefElement = await page.$('a');
@@ -828,10 +912,10 @@ At every point of time, page exposes its current frame tree via the [page.mainFr
 An example of dumping frame tree:
 
 ```js
-const playwright = require('playwright').firefox;  // Or 'chromium' or 'webkit'.
+const { firefox } = require('playwright');  // Or 'chromium' or 'webkit'.
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await firefox.launch();
   const context = await browser.newContext();
   const page = await context.newPage('https://www.google.com/chrome/browser/canary.html');
   dumpFrameTree(page.mainFrame(), '');
@@ -1287,10 +1371,10 @@ await page.waitFor(selector => !!document.querySelector(selector), {}, selector)
 
 The `waitForFunction` can be used to observe viewport size change:
 ```js
-const playwright = require('playwright').firefox;  // Or 'chromium' or 'webkit'.
+const { firefox } = require('playwright');  // Or 'chromium' or 'webkit'.
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await firefox.launch();
   const context = await browser.newContext();
   const page = await context.newPage();
   const watchDog = page.mainFrame().waitForFunction('window.innerWidth < 100');
@@ -1362,10 +1446,10 @@ immediately. If the selector doesn't appear after the `timeout` milliseconds of
 
 This method works across navigations:
 ```js
-const playwright = require('playwright').webkit;  // Or 'chromium' or 'firefox'.
+const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await webkit.launch();
   const context = await browser.newContext();
   const page = await context.newPage();
   let currentURL;
@@ -1671,10 +1755,10 @@ Page provides methods to interact with a single tab or [extension background pag
 
 This example creates a page, navigates it to a URL, and then saves a screenshot:
 ```js
-const playwright = require('playwright').webkit;  // Or 'chromium' or 'firefox'.
+const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await webkit.launch();
   const context = await browser.newContext();
   const page = await context.newPage('https://example.com');
   await page.screenshot({path: 'screenshot.png'});
@@ -2214,11 +2298,11 @@ If the `playwrightFunction` returns a [Promise], it will be awaited.
 
 An example of adding an `md5` function into the page:
 ```js
-const playwright = require('playwright').firefox;  // Or 'chromium' or 'webkit'.
+const { firefox } = require('playwright');  // Or 'chromium' or 'webkit'.
 const crypto = require('crypto');
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await firefox.launch();
   const context = await browser.newContext();
   const page = await context.newPage();
   page.on('console', msg => console.log(msg.text()));
@@ -2238,11 +2322,11 @@ const crypto = require('crypto');
 An example of adding a `window.readfile` function into the page:
 
 ```js
-const playwright = require('playwright').chromium;  // Or 'firefox' or 'webkit'.
+const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.
 const fs = require('fs');
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await chromium.launch();
   const context = await browser.newContext();
   const page = await context.newPage();
   page.on('console', msg => console.log(msg.text()));
@@ -2734,10 +2818,10 @@ Waits for event to fire and passes its value into the predicate function. Resolv
 
 The `waitForFunction` can be used to observe viewport size change:
 ```js
-const playwright = require('playwright').webkit;  // Or 'chromium' or 'firefox'.
+const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await webkit.launch();
   const context = await browser.newContext();
   const page = await context.newPage();
   const watchDog = page.waitForFunction('window.innerWidth < 100');
@@ -2842,10 +2926,10 @@ immediately. If the selector doesn't appear after the `timeout` milliseconds of
 
 This method works across navigations:
 ```js
-const playwright = require('playwright').chromium;  // Or 'firefox' or 'webkit'.
+const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.
 
 (async () => {
-  const browser = await playwright.launch();
+  const browser = await chromium.launch();
   const context = await browser.newContext();
   const page = await context.newPage();
   let currentURL;
@@ -3159,7 +3243,7 @@ Contains the URL of the WebSocket.
 
 * extends: [Error]
 
-TimeoutError is emitted whenever certain operations are terminated due to timeout, e.g. [page.waitForSelector(selector[, options])](#pagewaitforselectorselector-options) or [playwright.launch([options])](#playwrightlaunchoptions).
+TimeoutError is emitted whenever certain operations are terminated due to timeout, e.g. [page.waitForSelector(selector[, options])](#pagewaitforselectorselector-options) or [browserType.launch([options])](#browsertypelaunchoptions).
 
 ### class: Accessibility
 
@@ -3268,9 +3352,6 @@ for (const entry of coverage) {
 console.log(`Bytes used: ${usedBytes / totalBytes * 100}%`);
 ```
 
-_To output coverage in a form consumable by [Istanbul](https://github.com/istanbuljs),
-  see [playwright-to-istanbul](https://github.com/istanbuljs/playwright-to-istanbul)._
-
 <!-- GEN:toc -->
 - [coverage.startCSSCoverage([options])](#coveragestartcsscoverageoptions)
 - [coverage.startJSCoverage([options])](#coveragestartjscoverageoptions)
@@ -3587,18 +3668,18 @@ Playwright can be used for testing Chrome Extensions.
 
 The following is code for getting a handle to the [background page](https://developer.chrome.com/extensions/background_pages) of an extension whose source is located in `./my-extension`:
 ```js
-const playwright = require('playwright').chromium;
+const { chromium } = require('playwright');
 
 (async () => {
   const pathToExtension = require('path').join(__dirname, 'my-extension');
-  const browser = await playwright.launch({
+  const browser = await chromium.launch({
     headless: false,
     args: [
       `--disable-extensions-except=${pathToExtension}`,
       `--load-extension=${pathToExtension}`
     ]
   });
-  const targets = await browser.chromium.targets();
+  const targets = await browser.targets();
   const backgroundPageTarget = targets.find(target => target.type() === 'background_page');
   const backgroundPage = await backgroundPageTarget.page();
   // Test the background page as you would any other page.
@@ -3625,6 +3706,7 @@ During installation Playwright downloads browser executables, according to revis
 [Body]: #class-body  "Body"
 [BrowserApp]: #class-browserapp  "BrowserApp"
 [BrowserContext]: #class-browsercontext  "BrowserContext"
+[BrowserType]: #class-browsertype "BrowserType"
 [Browser]: #class-browser  "Browser"
 [Buffer]: https://nodejs.org/api/buffer.html#buffer_class_buffer "Buffer"
 [ChildProcess]: https://nodejs.org/api/child_process.html "ChildProcess"

docs/web.md

@@ -4,7 +4,7 @@ Playwright contains a version bundled for web browsers under `playwright/web.js`
 installs playwright under `window.playwrightweb`.
 You can use it in the web page to drive another browser instance.
 
-API consists of a single `connect` function, similar to [playwright.connect(options)](api.md#playwrightconnectoptions).
+API consists of a single `connect` function, similar to [browserType.connect(options)](api.md#browsertypeconnectoptions).
 
 ```html
 <script src='playwright/web.js'></script>

download-browser.js

@@ -15,13 +15,13 @@
  */
 
 async function downloadBrowser(browser) {
-  const playwright = require('.')[browser];
+  const browserType = require('.')[browser];
   let progressBar = null;
   let lastDownloadedBytes = 0;
   function onProgress(downloadedBytes, totalBytes) {
     if (!progressBar) {
       const ProgressBar = require('progress');
-      progressBar = new ProgressBar(`Downloading ${browser} ${playwright._revision} - ${toMegabytes(totalBytes)} [:bar] :percent :etas `, {
+      progressBar = new ProgressBar(`Downloading ${browser} ${browserType._revision} - ${toMegabytes(totalBytes)} [:bar] :percent :etas `, {
         complete: '=',
         incomplete: ' ',
         width: 20,
@@ -33,7 +33,7 @@ async function downloadBrowser(browser) {
     progressBar.tick(delta);
   }
 
-  const fetcher = playwright._createBrowserFetcher();
+  const fetcher = browserType._createBrowserFetcher();
   const revisionInfo = fetcher.revisionInfo();
   // Do nothing if the revision is already downloaded.
   if (revisionInfo.local)

index.d.ts

@@ -15,7 +15,9 @@
  */
 
 export * from './lib/api';
-export const chromium: import('./lib/server/crPlaywright').CRPlaywright;
+export const devices: typeof import('./lib/deviceDescriptors').DeviceDescriptors;
-export const firefox: import('./lib/server/ffPlaywright').FFPlaywright;
+export const errors: { TimeoutError: typeof import('./lib/errors').TimeoutError };
-export const webkit: import('./lib/server/wkPlaywright').WKPlaywright;
+export const chromium: import('./lib/api').Chromium;
+export const firefox: import('./lib/api').Firefox;
+export const webkit: import('./lib/api').WebKit;
 export type PlaywrightWeb = typeof import('./lib/web');

index.js

@@ -17,10 +17,11 @@
 const { helper } = require('./lib/helper');
 const api = require('./lib/api');
 const packageJson = require('./package.json');
-const { DeviceDescriptors } = require('./lib/deviceDescriptors');
+const DeviceDescriptors = require('./lib/deviceDescriptors');
-const CRPlaywright = require('./lib/server/crPlaywright').CRPlaywright;
+const { TimeoutError } = require('./lib/errors');
-const FFPlaywright = require('./lib/server/ffPlaywright').FFPlaywright;
+const { Chromium } = require('./lib/server/chromium');
-const WKPlaywright = require('./lib/server/wkPlaywright').WKPlaywright;
+const { Firefox } = require('./lib/server/firefox');
+const { WebKit } = require('./lib/server/webkit');
 
 for (const className in api) {
   if (typeof api[className] === 'function')
@@ -28,8 +29,9 @@ for (const className in api) {
 }
 
 module.exports = {
-  chromium: new CRPlaywright(__dirname, packageJson.playwright.chromium_revision),
-  firefox: new FFPlaywright(__dirname, packageJson.playwright.firefox_revision),
-  webkit: new WKPlaywright(__dirname, packageJson.playwright.webkit_revision),
   devices: DeviceDescriptors,
-};
+  errors: { TimeoutError },
+  chromium: new Chromium(__dirname, packageJson.playwright.chromium_revision),
+  firefox: new Firefox(__dirname, packageJson.playwright.firefox_revision),
+  webkit: new WebKit(__dirname, packageJson.playwright.webkit_revision),
+}

prepare.js

@@ -54,8 +54,7 @@ async function downloadAndCleanup(browser) {
   const revisionInfo = await downloadBrowser(browser);
 
   // Remove previous revisions.
-  const playwright = require('.')[browser];
+  const fetcher = require('.')[browser]._createBrowserFetcher();
-  const fetcher = playwright._createBrowserFetcher();
   const localRevisions = await fetcher.localRevisions();
   const cleanupOldVersions = localRevisions.filter(revision => revision !== revisionInfo.revision).map(revision => fetcher.remove(revision));
   await Promise.all([...cleanupOldVersions]);

src/api.ts

@@ -35,5 +35,5 @@ export { FFBrowser as FirefoxBrowser } from './firefox/ffBrowser';
 
 export { WKBrowser as WebKitBrowser } from './webkit/wkBrowser';
 
-export { Playwright } from './server/playwright';
+export { BrowserType } from './server/browserType';
 export { BrowserApp } from './server/browserApp';

src/server/browserType.ts

@@ -0,0 +1,50 @@
+/**
+ * Copyright (c) Microsoft Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as types from '../types';
+import { TimeoutError } from '../errors';
+import { Browser, ConnectOptions } from '../browser';
+import { BrowserApp } from './browserApp';
+
+export type BrowserArgOptions = {
+  headless?: boolean,
+  args?: string[],
+  userDataDir?: string,
+  devtools?: boolean,
+};
+
+export type LaunchOptions = BrowserArgOptions & {
+  executablePath?: string,
+  ignoreDefaultArgs?: boolean | string[],
+  handleSIGINT?: boolean,
+  handleSIGTERM?: boolean,
+  handleSIGHUP?: boolean,
+  timeout?: number,
+  dumpio?: boolean,
+  env?: {[key: string]: string} | undefined,
+  webSocket?: boolean,
+  slowMo?: number,  // TODO: we probably don't want this in launchBrowserApp.
+};
+
+export interface BrowserType {
+  executablePath(): string;
+  launchBrowserApp(options?: LaunchOptions): Promise<BrowserApp>;
+  launch(options?: LaunchOptions): Promise<Browser>;
+  defaultArgs(options?: BrowserArgOptions): string[];
+  connect(options: ConnectOptions & { browserURL?: string }): Promise<Browser>;
+  devices: types.Devices;
+  errors: { TimeoutError: typeof TimeoutError };
+}

src/server/chromium.ts

@@ -29,11 +29,11 @@ import { TimeoutError } from '../errors';
 import { launchProcess, waitForLine } from '../server/processLauncher';
 import { kBrowserCloseMessageId } from '../chromium/crConnection';
 import { PipeTransport } from './pipeTransport';
-import { Playwright, LaunchOptions, BrowserArgOptions } from './playwright';
+import { LaunchOptions, BrowserArgOptions, BrowserType } from './browserType';
 import { createTransport, ConnectOptions } from '../browser';
 import { BrowserApp } from './browserApp';
 
-export class CRPlaywright implements Playwright {
+export class Chromium implements BrowserType {
   private _projectRoot: string;
   readonly _revision: string;
 

src/server/firefox.ts

@@ -28,11 +28,11 @@ import * as path from 'path';
 import * as util from 'util';
 import { TimeoutError } from '../errors';
 import { assert } from '../helper';
-import { Playwright, LaunchOptions, BrowserArgOptions } from './playwright';
+import { LaunchOptions, BrowserArgOptions, BrowserType } from './browserType';
 import { createTransport, ConnectOptions } from '../browser';
 import { BrowserApp } from './browserApp';
 
-export class FFPlaywright implements Playwright {
+export class Firefox implements BrowserType {
   private _projectRoot: string;
   readonly _revision: string;
 

src/server/playwright.ts

@@ -16,35 +16,23 @@
 
 import * as types from '../types';
 import { TimeoutError } from '../errors';
-import { Browser, ConnectOptions } from '../browser';
+import { DeviceDescriptors } from '../deviceDescriptors';
-import { BrowserApp } from './browserApp';
+import { Chromium } from './chromium';
+import { WebKit } from './webkit';
+import { Firefox } from './firefox';
 
-export type BrowserArgOptions = {
+export class Playwright {
-  headless?: boolean,
+  readonly devices: types.Devices;
-  args?: string[],
+  readonly errors: { TimeoutError: typeof TimeoutError };
-  userDataDir?: string,
+  readonly chromium: Chromium;
-  devtools?: boolean,
+  readonly firefox: Firefox;
-};
+  readonly webkit: WebKit;
 
-export type LaunchOptions = BrowserArgOptions & {
+  constructor(projectRoot: string, revisions: { chromium_revision: string, firefox_revision: string, webkit_revision: string }) {
-  executablePath?: string,
+    this.devices = DeviceDescriptors;
-  ignoreDefaultArgs?: boolean | string[],
+    this.errors = { TimeoutError };
-  handleSIGINT?: boolean,
+    this.chromium = new Chromium(projectRoot, revisions.chromium_revision);
-  handleSIGTERM?: boolean,
+    this.firefox = new Firefox(projectRoot, revisions.firefox_revision);
-  handleSIGHUP?: boolean,
+    this.webkit = new WebKit(projectRoot, revisions.webkit_revision);
-  timeout?: number,
+  }
-  dumpio?: boolean,
-  env?: {[key: string]: string} | undefined,
-  webSocket?: boolean,
-  slowMo?: number,  // TODO: we probably don't want this in launchBrowserApp.
-};
-
-export interface Playwright {
-  executablePath(): string;
-  launchBrowserApp(options?: LaunchOptions): Promise<BrowserApp>;
-  launch(options?: LaunchOptions): Promise<Browser>;
-  defaultArgs(options?: BrowserArgOptions): string[];
-  connect(options: ConnectOptions & { browserURL?: string }): Promise<Browser>;
-  devices: types.Devices;
-  errors: { TimeoutError: typeof TimeoutError };
 }

src/server/webkit.ts

@@ -30,14 +30,14 @@ import * as util from 'util';
 import * as os from 'os';
 import { assert } from '../helper';
 import { kBrowserCloseMessageId } from '../webkit/wkConnection';
-import { Playwright, BrowserArgOptions, LaunchOptions } from './playwright';
+import { LaunchOptions, BrowserArgOptions, BrowserType } from './browserType';
 import { ConnectionTransport } from '../transport';
 import * as ws from 'ws';
 import * as uuidv4 from 'uuid/v4';
 import { ConnectOptions } from '../browser';
 import { BrowserApp } from './browserApp';
 
-export class WKPlaywright implements Playwright {
+export class WebKit implements BrowserType {
   private _projectRoot: string;
   readonly _revision: string;