**Do you want to request a *feature* or report a *bug*?**

Bug. Regression to be more concrete - https://github.com/facebook/react-devtools/pull/1191

**What is the current behavior?**

Show Source points to a Function Component body, and Class Component constructor.

**What is the expected behavior?**

In both cases, you should see "render" methods, class constructor is never something you might want to jump straight into. It was working in this expected way in a previous version of Dev Tools.

**Why this is an issue?**

Well, until React-Hot-Loader is not 100% deprecated, "Show Source" would not work at all, as long as it (and not only it - `mobx` would do the same) is wrapping class constructor, however keeping `render` untouched.
return IS_CHROME ? 'Chrome' : 'Firefox';
}
export type BrowserTheme = 'dark' | 'light';
export function getBrowserTheme(): BrowserTheme {
  if (IS_CHROME) {
    
    
    return chrome.devtools.panels.themeName === 'dark' ? 'dark' : 'light';
  } else {
    
    
    if (chrome.devtools && chrome.devtools.panels) {
      switch (chrome.devtools.panels.themeName) {
        case 'dark':
          return 'dark';
        default:
          return 'light';
      }
    }
  }
}