Variables
Const BEFORE_MOUNT
BEFORE_MOUNT: "before-mount" = "before-mount"
Const BEFORE_UNMOUNT
BEFORE_UNMOUNT: "before-unmount" = "before-unmount"
Const INITIALIZE
INITIALIZE: "initialize" = "initialize"
Const MOUNT
MOUNT: "mount" = "mount"
Const UNMOUNT
UNMOUNT: "unmount" = "unmount"
Const UPDATE
UPDATE: "update" = "update"
Const UPDATED
UPDATED: "updated" = "updated"