puppeteer/index.js
Andrey Lushnikov f230722ff0
refactor: avoid dynamic requires in lib/ folder (#3208)
This patch removes all dynamic requires in Puppeteer. This should
make it much simpler to bundle puppeteer/puppeteer-core packages.

We used dynamic requires in a few places in lib/:
- BrowserFetcher was choosing between `http` and `https` based on some
  runtime value. This was easy to fix with explicit `require`.
- BrowserFetcher and Launcher needed to know project root to store
  chromium revisions and to read package name and chromium revision from
  package.json. (projectRoot value would be different in node6).
  Instead of doing a backwards logic to infer these
  variables, we now pass them directly from `//index.js`.

With this patch, I was able to bundle Puppeteer using browserify and
the following config in `package.json`:

```json
  "browser": {
    "./lib/BrowserFetcher.js": false,
    "ws": "./lib/BrowserWebSocket",
    "fs": false,
    "child_process": false,
    "rimraf": false,
    "readline": false
  }
```

(where `lib/BrowserWebSocket.js` is a courtesy of @Janpot from
https://github.com/GoogleChrome/puppeteer/pull/2374/)

And command:

```sh
$ browserify -r puppeteer:./index.js > ppweb.js
```

References #2119
2018-09-06 20:33:41 +01:00

31 lines
1.1 KiB
JavaScript

/**
* Copyright 2017 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.
*/
let asyncawait = true;
try {
new Function('async function test(){await 1}');
} catch (error) {
asyncawait = false;
}
// If node does not support async await, use the compiled version.
const Puppeteer = asyncawait ? require('./lib/Puppeteer') : require('./node6/lib/Puppeteer');
const packageJson = require('./package.json');
const preferredRevision = packageJson.puppeteer.chromium_revision;
const isPuppeteerCore = packageJson.name === 'puppeteer-core';
module.exports = new Puppeteer(__dirname, preferredRevision, isPuppeteerCore);