Yarn workspaces

Summary:
1) moved "sonar/desktop/src" to "sonar/desktop/app/src", so "app" is now a separate package containing the core Flipper app code
2) Configured yarn workspaces with the root in "sonar/desktop": app, static, pkg, doctor, headless-tests. Plugins are not included for now, I plan to do this later.

Reviewed By: jknoxville

Differential Revision: D20535782

fbshipit-source-id: 600b2301960f37c7d72166e0d04eba462bec9fc1

desktop/app/src/utils/launcherSettingsStorage.tsx

@@ -0,0 +1,79 @@
+/**
+ * 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 fs from 'fs';
+import path from 'path';
+import TOML from '@iarna/toml';
+import {Storage} from 'redux-persist/es/types';
+import {
+  defaultLauncherSettings,
+  LauncherSettings,
+} from '../reducers/launcherSettings';
+
+export default class LauncherSettingsStorage implements Storage {
+  constructor(readonly filepath: string) {}
+
+  async getItem(_key: string): Promise<any> {
+    return await this.parseFile();
+  }
+
+  async setItem(_key: string, value: LauncherSettings): Promise<any> {
+    const originalValue = await this.parseFile();
+    await this.writeFile(value);
+    return originalValue;
+  }
+
+  removeItem(_key: string): Promise<void> {
+    return this.writeFile(defaultLauncherSettings);
+  }
+
+  private async parseFile(): Promise<LauncherSettings> {
+    try {
+      const content = fs.readFileSync(this.filepath).toString();
+      return deserialize(content);
+    } catch (e) {
+      console.warn(
+        `Failed to read settings file: "${this.filepath}". ${e}. Replacing file with default settings.`,
+      );
+      await this.writeFile(defaultLauncherSettings);
+      return defaultLauncherSettings;
+    }
+  }
+
+  private async writeFile(value: LauncherSettings): Promise<void> {
+    this.ensureDirExists();
+    const content = serialize(value);
+    fs.writeFileSync(this.filepath, content);
+  }
+
+  private ensureDirExists(): void {
+    const dir = path.dirname(this.filepath);
+    fs.existsSync(dir) || fs.mkdirSync(dir, {recursive: true});
+  }
+}
+
+interface FormattedSettings {
+  ignore_local_pin?: boolean;
+}
+
+function serialize(value: LauncherSettings): string {
+  const {ignoreLocalPin, ...rest} = value;
+  return TOML.stringify({
+    ...rest,
+    ignore_local_pin: ignoreLocalPin,
+  });
+}
+
+function deserialize(content: string): LauncherSettings {
+  const {ignore_local_pin, ...rest} = TOML.parse(content) as FormattedSettings;
+  return {
+    ...rest,
+    ignoreLocalPin: !!ignore_local_pin,
+  };
+}