.jshintrc

configitems: enable changegroup3 by default (unless using infinitepush)

The LFS extension requires this, and if it isn't enabled on the client (or the
LFS extension isn't loaded), a web client gets a 500 instead of a sensible error
message.  Now it gets a different (client) error, but maybe it can be handled
more gracefully.  c0f11347b107 indicates that treemanifest repos have this issue
too.  29cfc474c5fd mentions gating this behind `experimental` so that the format
could change, but that was 7 years ago and we now have an experimental
`changegroup4` as well.

We can keep this as a config for the next cycle in case someone runs into an
unexpected problem, and then jettison it if the infinitepush bundle name changes
are either acceptable as-is or can be created differently.

{
    // 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)
}