WordPress/wp-includes/blocks/loginout/block.json

{
	"apiVersion": 2,
	"name": "core/loginout",
	"title": "Login/out",
	"category": "design",
	"description": "Show login & logout links.",
	"keywords": [ "login", "logout", "form" ],
	"textdomain": "default",
	"attributes": {
		"displayLoginAsForm": {
			"type": "boolean",
			"default": false
		},
		"redirectToCurrent": {
			"type": "boolean",
			"default": true
		}
	},
	"supports": {
		"className": true,
		"fontSize": false
	}
}