How do I sync the Visual Studio Code (vscode) theme to use my OS light/dark color scheme?
This was released in 1.42:


  Auto switch Theme based on OS color scheme
  
  Windows and macOS now
  support light and dark color schemes. There is a new setting,
  window.autoDetectColorScheme, that instructs VS Code to listen to
  changes to the OS's color scheme and switch to a matching theme
  accordingly.
  
  To customize the themes that are used when a color scheme changes, you
  can set the preferred light and dark theme with the settings:
  
  
  workbench.preferredLightColorTheme
  workbench.preferredDarkColorTheme