code: function (embedder, options) {
    if (options.webPreferences == null) {
      options.webPreferences = {}
    }
    if (embedder.browserWindowOptions != null) {
      let parentOptions = embedder.browserWindowOptions
  
      // if parent's visibility is available, that overrides 'show' flag (#12125)
      const win = BrowserWindow.fromWebContents(embedder.webContents)
      if (win != null) {
        parentOptions = { ...embedder.browserWindowOptions, show: win.isVisible() }
      }
  
      // Inherit the original options if it is a BrowserWindow.
      mergeOptions(options, parentOptions)
    } else {
      // Or only inherit webPreferences if it is a webview.
      mergeOptions(options.webPreferences, embedder.getLastWebPreferences())
    }
  
    // Inherit certain option values from parent window
    const webPreferences = embedder.getLastWebPreferences()
    for (const [name, value] of inheritedWebPreferences) {
      if (webPreferences[name] === value) {
        options.webPreferences[name] = value
      }
    }
  
    // Sets correct openerId here to give correct options to 'new-window' event handler
    options.webPreferences.openerId = embedder.id
  
    return options
  }
docs: Merge |options| with the |embedder|'s window's options.