Just like JSHint had:

/*
Option: consistentQuoteMarks
requires all quote marks to be consistent
possible values: "single", "double", true

single:
Invalid example:
var foo = "blah blah";

Valid example:
var foo = 'blah blah';

double:
Invalid example:
var foo = 'blah blah';

Valid example:
var foo = "blah blah";

true:
Invalid example:
var foo = 'blah blah';
var bar = "blah blah";

Valid example:
var foo = "blah blah";
var bar = "blah blah";

Valid example:
var foo = 'blah blah';
var bar = 'blah blah';

*/