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//proc/thread-self/root/usr/lib/nodejs/json-stable-stringify/index.js

var json = typeof JSON !== 'undefined' ? JSON : require('jsonify');

module.exports = function (obj, opts) {
    if (!opts) opts = {};
    if (typeof opts === 'function') opts = { cmp: opts };
    var space = opts.space || '';
    if (typeof space === 'number') space = Array(space+1).join(' ');
    var cycles = (typeof opts.cycles === 'boolean') ? opts.cycles : false;
    var replacer = opts.replacer || function(key, value) { return value; };

var seen = [];
    return (function stringify (parent, key, node, level) {
        var indent = space ? ('\n' + new Array(level + 1).join(space)) : '';
        var colonSeparator = space ? ': ' : ':';

if (node && node.toJSON && typeof node.toJSON === 'function') {
            node = node.toJSON();
        }

node = replacer.call(parent, key, node);

if (node === undefined) {
            return;
        }
        if (typeof node !== 'object' || node === null) {
            return json.stringify(node);
        }
        if (isArray(node)) {
            var out = [];
            for (var i = 0; i < node.length; i++) {
                var item = stringify(node, i, node[i], level+1) || json.stringify(null);
                out.push(indent + space + item);
            }
            return '[' + out.join(',') + indent + ']';
        }
        else {
            if (seen.indexOf(node) !== -1) {
                if (cycles) return json.stringify('__cycle__');
                throw new TypeError('Converting circular structure to JSON');
            }
            else seen.push(node);

var keys = objectKeys(node).sort(cmp && cmp(node));
            var out = [];
            for (var i = 0; i < keys.length; i++) {
                var key = keys[i];
                var value = stringify(node, key, node[key], level+1);

if(!value) continue;

var keyValue = json.stringify(key)
                    + colonSeparator
                    + value;
                ;
                out.push(indent + space + keyValue);
            }
            seen.splice(seen.indexOf(node), 1);
            return '{' + out.join(',') + indent + '}';
        }
    })({ '': obj }, '', obj, 0);
};

var isArray = Array.isArray || function (x) {
    return {}.toString.call(x) === '[object Array]';
};