What is the name of the command again to display phantom spawning in Minecraft?

What is the name of the command again to display phantom spawning in Minecraft?

/ gamerule doInsomnia false

Nene already gives something that the phantoms don't spawn after the three nights without sleep.

Okay, I believe you.

Try / kill @ e [type = minecraft: phantom]

with a command block and a redstone clock

That is clear. But as in the question above and I have already written under another answer, a command is not wanted to kill the phantoms, but that they do not spawn at all.

Stop insulting me

How so? I don't.