Is "noop" a real command?

[cheelam]

Normally, the “noop” command is used to indicate no-operation. Example usage in key binding:
[
{ “keys”: [“ctrl+super+d”], “command”: “noop” },
]

Is “noop” a core command or Python plugin?

[jfcherng]

ST does nothing for a nonexistent command and no error will be emitted.