Start application in the right theme

Summary:
Changelog: Improved dark mode support!

This diff makes sure that the dark mode preference is written to the Flipper config, and applied during startup, so that the ugly light/dark flash when starting Flipper in dark mode disappears

Reviewed By: passy

Differential Revision: D29436059

fbshipit-source-id: 0f762149848298512026fbd216d9a9e0bf4276db

desktop/static/main.ts

@@ -108,6 +108,9 @@ if (argv['disable-gpu'] || process.env.FLIPPER_DISABLE_GPU === '1') {
 }
 
 process.env.CONFIG = JSON.stringify(config);
+if (config.darkMode) {
+  nativeTheme.themeSource = 'dark';
+}
 
 // possible reference to main app window
 let win: BrowserWindow;
@@ -270,7 +273,6 @@ ipcMain.on('getLaunchTime', (event) => {
 });
 
 ipcMain.on('setTheme', (_e, mode: 'light' | 'dark') => {
-  console.log('Switching to theme ' + mode);
   nativeTheme.themeSource = mode;
 });
 
@@ -362,6 +364,7 @@ function createWindow() {
       configPath,
       JSON.stringify({
         ...config,
+        darkMode: nativeTheme.themeSource === 'dark',
         lastWindowPosition: {
           x,
           y,