JAVASCRIPT

discord.js make channel private

channel.permissionOverwrites.create(channel.guild.roles.everyone, { VIEW_CHANNEL: false });

discord.js create a private channel

guild.channels.create('new-channel', {
	type: 'GUILD_TEXT',
	permissionOverwrites: [
		{
			id: message.guild.id,
			deny: [Permissions.FLAGS.VIEW_CHANNEL],
		},
	],
});