feat: implement the Puppeteer CLI

docs/browsers-api/browsers.cli._constructor_.md

@@ -10,13 +10,29 @@ Constructs a new instance of the `CLI` class
 
 ```typescript
 class CLI {
-  constructor(cachePath?: string, rl?: readline.Interface);
+  constructor(
+    opts?:
+      | string
+      | {
+          cachePath?: string;
+          scriptName?: string;
+          prefixCommand?: {
+            cmd: string;
+            description: string;
+          };
+          allowCachePathOverride?: boolean;
+          pinnedBrowsers?: Partial<{
+            [key in Browser]: string;
+          }>;
+        },
+    rl?: readline.Interface
+  );
 }
 ```
 
 ## Parameters
 
-| Parameter | Type               | Description  |
-| --------- | ------------------ | ------------ |
-| cachePath | string             | _(Optional)_ |
-| rl        | readline.Interface | _(Optional)_ |
+| Parameter | Type                                                                                                                                                                                                                                      | Description  |
+| --------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------ |
+| opts      | string \| { cachePath?: string; scriptName?: string; prefixCommand?: { cmd: string; description: string; }; allowCachePathOverride?: boolean; pinnedBrowsers?: Partial&lt;{ \[key in [Browser](./browsers.browser.md)\]: string; }&gt;; } | _(Optional)_ |
+| rl        | readline.Interface                                                                                                                                                                                                                        | _(Optional)_ |

docs/browsers-api/browsers.cli.md

@@ -12,9 +12,9 @@ export declare class CLI
 
 ## Constructors
 
-| Constructor                                                     | Modifiers | Description                                             |
-| --------------------------------------------------------------- | --------- | ------------------------------------------------------- |
-| [(constructor)(cachePath, rl)](./browsers.cli._constructor_.md) |           | Constructs a new instance of the <code>CLI</code> class |
+| Constructor                                                | Modifiers | Description                                             |
+| ---------------------------------------------------------- | --------- | ------------------------------------------------------- |
+| [(constructor)(opts, rl)](./browsers.cli._constructor_.md) |           | Constructs a new instance of the <code>CLI</code> class |
 
 ## Methods
 

docs/contributing.md

@@ -32,7 +32,7 @@ again.
 
    ```bash
    npm install
-   # Or to download Firefox
+   # Or to download Firefox by default
    PUPPETEER_PRODUCT=firefox npm install
    ```
 

docs/faq.md

@@ -117,6 +117,12 @@ To fetch Firefox Nightly as part of Puppeteer installation:
 PUPPETEER_PRODUCT=firefox npm i puppeteer
 ```
 
+To download Firefox Nightly into an existing Puppeteer project:
+
+```bash
+npx puppeteer browsers install firefox
+```
+
 #### Q: What’s considered a “Navigation”?
 
 From Puppeteer’s standpoint, **“navigation” is anything that changes a page’s

packages/browsers/src/CLI.ts

@@ -68,10 +68,37 @@ interface ClearArgs {
 export class CLI {
   #cachePath;
   #rl?: readline.Interface;
+  #scriptName = '';
+  #allowCachePathOverride = true;
+  #pinnedBrowsers?: Partial<{[key in Browser]: string}>;
+  #prefixCommand?: {cmd: string; description: string};
 
-  constructor(cachePath = process.cwd(), rl?: readline.Interface) {
-    this.#cachePath = cachePath;
+  constructor(
+    opts?:
+      | string
+      | {
+          cachePath?: string;
+          scriptName?: string;
+          prefixCommand?: {cmd: string; description: string};
+          allowCachePathOverride?: boolean;
+          pinnedBrowsers?: Partial<{[key in Browser]: string}>;
+        },
+    rl?: readline.Interface
+  ) {
+    if (!opts) {
+      opts = {};
+    }
+    if (typeof opts === 'string') {
+      opts = {
+        cachePath: opts,
+      };
+    }
+    this.#cachePath = opts.cachePath ?? process.cwd();
     this.#rl = rl;
+    this.#scriptName = opts.scriptName ?? '@puppeteer/browsers';
+    this.#allowCachePathOverride = opts.allowCachePathOverride ?? true;
+    this.#pinnedBrowsers = opts.pinnedBrowsers;
+    this.#prefixCommand = opts.prefixCommand;
   }
 
   #defineBrowserParameter(yargs: Yargs.Argv<unknown>): void {
@@ -98,6 +125,9 @@ export class CLI {
   }
 
   #definePathParameter(yargs: Yargs.Argv<unknown>, required = false): void {
+    if (!this.#allowCachePathOverride) {
+      return;
+    }
     yargs.option('path', {
       type: 'string',
       desc: 'Path to the root folder for the browser downloads and installation. The installation folder structure is compatible with the cache structure used by Puppeteer.',
@@ -111,8 +141,28 @@ export class CLI {
 
   async run(argv: string[]): Promise<void> {
     const yargsInstance = yargs(hideBin(argv));
-    await yargsInstance
-      .scriptName('@puppeteer/browsers')
+    let target = yargsInstance.scriptName(this.#scriptName);
+    if (this.#prefixCommand) {
+      target = target.command(
+        this.#prefixCommand.cmd,
+        this.#prefixCommand.description,
+        yargs => {
+          return this.#build(yargs);
+        }
+      );
+    } else {
+      target = this.#build(target);
+    }
+    await target
+      .demandCommand(1)
+      .help()
+      .wrap(Math.min(120, yargsInstance.terminalWidth()))
+      .parse();
+  }
+
+  #build(yargs: Yargs.Argv<unknown>): Yargs.Argv<unknown> {
+    const latestOrPinned = this.#pinnedBrowsers ? 'pinned' : 'latest';
+    return yargs
       .command(
         'install <browser>',
         'Download and install the specified browser. If successful, the command outputs the actual browser buildId that was installed and the absolute path to the browser executable (format: <browser>@<buildID> <path>).',
@@ -126,7 +176,7 @@ export class CLI {
           });
           yargs.example(
             '$0 install chrome',
-            'Install the latest available build of the Chrome browser.'
+            `Install the ${latestOrPinned} available build of the Chrome browser.`
           );
           yargs.example(
             '$0 install chrome@latest',
@@ -176,17 +226,28 @@ export class CLI {
             '$0 install firefox --platform mac',
             'Install the latest Mac (Intel) build of the Firefox browser.'
           );
-          yargs.example(
-            '$0 install firefox --path /tmp/my-browser-cache',
-            'Install to the specified cache directory.'
-          );
+          if (this.#allowCachePathOverride) {
+            yargs.example(
+              '$0 install firefox --path /tmp/my-browser-cache',
+              'Install to the specified cache directory.'
+            );
+          }
         },
         async argv => {
           const args = argv as unknown as InstallArgs;
           args.platform ??= detectBrowserPlatform();
           if (!args.platform) {
             throw new Error(`Could not resolve the current platform`);
           }
+          if (args.browser.buildId === 'pinned') {
+            const pinnedVersion = this.#pinnedBrowsers?.[args.browser.name];
+            if (!pinnedVersion) {
+              throw new Error(
+                `No pinned version found for ${args.browser.name}`
+              );
+            }
+            args.browser.buildId = pinnedVersion;
+          }
           args.browser.buildId = await resolveBuildId(
             args.browser.name,
             args.platform,
@@ -272,7 +333,9 @@ export class CLI {
       )
       .command(
         'clear',
-        'Removes all installed browsers from the specified cache directory',
+        this.#allowCachePathOverride
+          ? 'Removes all installed browsers from the specified cache directory'
+          : `Removes all installed browsers from ${this.#cachePath}`,
         yargs => {
           this.#definePathParameter(yargs, true);
         },
@@ -296,9 +359,7 @@ export class CLI {
         }
       )
       .demandCommand(1)
-      .help()
-      .wrap(Math.min(120, yargsInstance.terminalWidth()))
-      .parse();
+      .help();
   }
 
   #parseBrowser(version: string): Browser {
@@ -307,7 +368,11 @@ export class CLI {
 
   #parseBuildId(version: string): string {
     const parts = version.split('@');
-    return parts.length === 2 ? parts[1]! : 'latest';
+    return parts.length === 2
+      ? parts[1]!
+      : this.#pinnedBrowsers
+        ? 'pinned'
+        : 'latest';
   }
 }
 

packages/puppeteer-core/src/node/ProductLauncher.ts

@@ -423,14 +423,14 @@ export abstract class ProductLauncher {
         case 'chrome':
           throw new Error(
             `Could not find Chrome (ver. ${this.puppeteer.browserRevision}). This can occur if either\n` +
-              ' 1. you did not perform an installation before running the script (e.g. `npm install`) or\n' +
+              ' 1. you did not perform an installation before running the script (e.g. `npx puppeteer browsers install chrome`) or\n' +
               ` 2. your cache path is incorrectly configured (which is: ${this.puppeteer.configuration.cacheDirectory}).\n` +
               'For (2), check out our guide on configuring puppeteer at https://pptr.dev/guides/configuration.'
           );
         case 'firefox':
           throw new Error(
             `Could not find Firefox (rev. ${this.puppeteer.browserRevision}). This can occur if either\n` +
-              ' 1. you did not perform an installation for Firefox before running the script (e.g. `PUPPETEER_PRODUCT=firefox npm install`) or\n' +
+              ' 1. you did not perform an installation for Firefox before running the script (e.g. `npx puppeteer browsers install firefox`) or\n' +
               ` 2. your cache path is incorrectly configured (which is: ${this.puppeteer.configuration.cacheDirectory}).\n` +
               'For (2), check out our guide on configuring puppeteer at https://pptr.dev/guides/configuration.'
           );

packages/puppeteer/package.json

@@ -9,6 +9,7 @@
     "automation"
   ],
   "type": "commonjs",
+  "bin": "./lib/esm/puppeteer/node/cli.js",
   "main": "./lib/cjs/puppeteer/puppeteer.js",
   "types": "./lib/types.d.ts",
   "exports": {
@@ -77,7 +78,7 @@
       ]
     },
     "build:tsc": {
-      "command": "tsc -b",
+      "command": "tsc -b && tsx ../../tools/chmod.ts 755 lib/cjs/puppeteer/node/cli.js lib/esm/puppeteer/node/cli.js",
       "clean": "if-file-deleted",
       "dependencies": [
         "../puppeteer-core:build",

packages/puppeteer/src/node/cli.ts

@@ -0,0 +1,41 @@
+#!/usr/bin/env node
+
+/**
+ * Copyright 2023 Google Inc. All rights reserved.
+ *
+ * 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 {CLI, Browser} from '@puppeteer/browsers';
+import {PUPPETEER_REVISIONS} from 'puppeteer-core/internal/revisions.js';
+
+import puppeteer from '../puppeteer.js';
+
+// TODO: deprecate downloadPath in favour of cacheDirectory.
+const cacheDir =
+  puppeteer.configuration.downloadPath ??
+  puppeteer.configuration.cacheDirectory!;
+
+void new CLI({
+  cachePath: cacheDir,
+  scriptName: 'puppeteer',
+  prefixCommand: {
+    cmd: 'browsers',
+    description: 'Manage browsers of this Puppeteer installation',
+  },
+  allowCachePathOverride: false,
+  pinnedBrowsers: {
+    [Browser.CHROME]: PUPPETEER_REVISIONS.chrome,
+    [Browser.FIREFOX]: PUPPETEER_REVISIONS.firefox,
+  },
+}).run(process.argv);