Toggle Dark Mode

DarkMode.applescript

on setDarkMode(shouldBeDark)
	
	set paneID to "com.apple.preference.general"
	
	tell application "System Events"
		if dark mode of appearance preferences is shouldBeDark then return
	end tell
	
	set paneWasOpen to false
	
	(*
		If SysPrefs is already running and showing the "General" pane,
		then toggling dark mode causes the UI of the pane to become
		out-of-sync with actual system appearance. To account for this,
		we'll quit SysPrefs if it's open to General prefs, and then
		re-open it after we've made the change
	*)
	if application "System Preferences" is running then
		tell application "System Preferences"
			if show all is false and id of current pane is paneID then
				set paneWasOpen to true
				quit
			end if
		end tell
	end if
	
	tell application "System Events"
		set dark mode of appearance preferences to shouldBeDark
	end tell
	
	if paneWasOpen then
		tell application "System Preferences"
			launch
			delay 3
			activate
			reveal (the first pane whose id is paneID)
		end tell
	end if
	
end setDarkMode

set result to display dialog "Set System Appearance" buttons ["Light Mode", "Dark Mode"]
if button returned of result is "Light Mode" then
	setDarkMode(false)
else
	setDarkMode(true)
end if

There is a solution to toggle dark/light mode smothly like when choose from com.apple.preference.general panel?
This abrupt change hurt my eyes

I adapted your solution in case you want to check
Now running as smooth as it should be
https://gist.github.com/tucomel/2fd454ffabbdb11300a03e20e99b367b

This is GREAT. I modified it a bit to toggle rather than show a dialog, which works great as a KeyMaestro action.

set paneID to "com.apple.preference.general"
set paneWasOpen to false

--If SysPrefs is already running and showing the "General" pane,
--then toggling dark mode causes the UI of the pane to become
--out-of-sync with actual system appearance. To account for this,
--we'll quit SysPrefs if it's open to General prefs, and then
--re-open it after we've made the change

if application "System Preferences" is running then
tell application "System Preferences"
if show all is false and id of current pane is paneID then
set paneWasOpen to true
quit
end if
end tell
end if

tell application "System Events"
if dark mode of appearance preferences is true then
set dark mode of appearance preferences to false
else
set dark mode of appearance preferences to true
end if

if paneWasOpen then
	tell application "System Preferences"
		launch
		delay 3
		activate
		reveal (the first pane whose id is paneID)
	end tell
end if

end tell

bigsur already do this by itself, this script is only needed before bigsur version

bigsur already do this by itself, this script is only needed before bigsur version

yeah ? well Monterey didn't fixed it for me, the auto-toggle is always pure shitshow.