dist/utils.js
function stripNegate(val, negate) {
    negate = escape(negate || constants_1.NEGATE_CHAR);
    var exp = new RegExp('^' + negate);
    return val.replace(exp, '');
}
function stripNegate(val, negate) {
    negate = escape(negate || constants_1.NEGATE_CHAR);
    var exp = new RegExp('^' + negate);
    return val.replace(exp, '');
}
Strips negate chars from flag.

@param val the value to be stripped.
@param negate the characters denoting negate.