Google leaves that as a team preference. Go certainly has highly opinionated style enforcement, but it is surprisingly not automatic formatting across the board

Google leaves that as a team preference. Go certainly has highly opinionated style enforcement, but it is surprisingly not automatic formatting across the board. Amazon may have changed, but this is also not universal. Team preference, though they may be enforcing it in the older code base for the site (i.e. detail pages, etc.). Facebook is the only one on your list I can confirm does, in part perhaps due to the predominant language (Hack).