.jshintrc

util: move common proxyobserver attributes to the base class

Fixes the following pytype warnings:

    line 791, in _writedata: No attribute 'logdata' on baseproxyobserver [attribute-error]
    line 792, in _writedata: No attribute 'logdataapis' on baseproxyobserver [attribute-error]
    line 793, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 794, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 799, in _writedata: No attribute 'logdataapis' on baseproxyobserver [attribute-error]
    line 800, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 802, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 803, in _writedata: No attribute 'name' on baseproxyobserver [attribute-error]
    line 805, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 809, in _writedata: No attribute 'logdataapis' on baseproxyobserver [attribute-error]
    line 810, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 814, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]
    line 815, in _writedata: No attribute 'name' on baseproxyobserver [attribute-error]
    line 817, in _writedata: No attribute 'fh' on baseproxyobserver [attribute-error]

Differential Revision: https://phab.mercurial-scm.org/D7675

{
    // 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)
}