narrow: move requirement constant to core
My short-term goal is to move narrowrepo.narrowmatch() onto localrepo
and this is a necessary step for that.
I put the constant in changegroup.py, unlike REVLOGV2_REQUIREMENT,
which is in localrepo.py, since we'll need to access it from the
changegroup module eventually.
Differential Revision: https://phab.mercurial-scm.org/D2487
{
// Enforcing
"eqeqeq" : true, // true: Require triple equals (===) for comparison
"forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty()
"freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
"nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters.
"undef" : true, // true: Require all non-global variables to be declared (prevents global leaks)
// Environments
"browser" : true // Web Browser (window, document, etc)
}