Move desktop-related code to "desktop" subfolder (#872)

Summary:
Pull Request resolved: https://github.com/facebook/flipper/pull/872
Move all the JS code related to desktop app to "desktop" subfolder.

The structure of "desktop" folder:
- `src` - JS code of Flipper desktop app executing in Electron Renderer (Chrome) process. This folder also contains all the Flipper plugins in subfolder "src/plugins".
- `static` - JS code of Flipper desktop app bootstrapping executing in Electron Main (Node.js) process
- `pkg` - Flipper packaging lib and CLI tool
- `doctor` - Flipper diagnostics lib and CLI tool
- `scripts` - Build scripts for Flipper desktop app
- `headless` - Headless version of Flipper app
- `headless-tests` - Integration tests running agains Flipper headless version

Reviewed By: passy

Differential Revision: D20249304

fbshipit-source-id: 9a51c63b51b92b758a02fc8ebf7d3d116770efe9

desktop/scripts/yarn-install.ts

@@ -0,0 +1,65 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import path from 'path';
+import util from 'util';
+import globImport from 'glob';
+import {exec as execImport} from 'child_process';
+const glob = util.promisify(globImport);
+const exec = util.promisify(execImport);
+const PACKAGES = [
+  'headless-tests',
+  'static',
+  'src/plugins/*',
+  'src/fb/plugins/*',
+  'src/fb/plugins/layout/*',
+];
+const WINDOWS = /^win/.test(process.platform);
+const YARN_PATH =
+  process.argv.length > 2
+    ? path.join(__dirname, process.argv[2])
+    : 'yarn' + (WINDOWS ? '.cmd' : '');
+
+Promise.all(
+  PACKAGES.map(pattern =>
+    glob(path.join(__dirname, '..', pattern, 'package.json')),
+  ),
+)
+  .then(async packages => {
+    const flattenPackages = packages.reduce((acc, cv) => acc.concat(cv), []);
+    console.log(
+      `Installing dependencies for ${flattenPackages.length} plugins`,
+    );
+    for (const pkg of flattenPackages) {
+      const {stderr} = await exec(
+        // This script is itself executed by yarn (as postinstall script),
+        // therefore another yarn instance is running, while we are trying to
+        // install the plugin dependencies. We are setting a different port
+        // for the mutex of this yarn instance to make sure, it is not blocked
+        // by the yarn instance which is executing this script. Otherwise this
+        // will cause a deadlock.
+        [YARN_PATH, '--mutex', 'network:30330'].join(' '),
+        {
+          cwd: pkg.replace('/package.json', ''),
+        },
+      );
+      if (stderr) {
+        console.warn(stderr);
+      } else {
+        console.log(`Installed dependencies for ${pkg}`);
+      }
+    }
+  })
+  // eslint-disable-next-line
+  .then(() => console.log('📦  Installed all plugin dependencies!'))
+  .catch(err => {
+    console.error('❌  Installing plugin dependencies failed.');
+    console.error(err);
+    process.exit(1);
+  });