JavaScript and/or AngularJS style guides?

Ran across a link to [Angular Style Guide | John Papa][1] today via a [tweet][2]. I took a read through John Papa's opinionated style guide (j[ohnpapa/angularjs-styleguide · GitHub][3]) as well as one by Todd Motto ([toddmotto/angularjs-styleguide · GitHub][4]). What style guides are in place for larger Javascript / AngularJS projects? What tools to we have for programatic enforcement and reformatting of code? [1]:
http://www.johnpapa.net/angular-style-guide/ [2]:
https://twitter.com/John_Papa/status/494112207492247552 [3]:
https://github.com/johnpapa/angularjs-styleguide [4]:
https://github.com/toddmotto/angularjs-styleguide

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