text: 'use strict';
  
  module.exports = function (data, opts) {
      if (!opts) opts = {};
      if (typeof opts === 'function') opts = { cmp: opts };
      var cycles = (typeof opts.cycles === 'boolean') ? opts.cycles : false;
  
      var cmp = opts.cmp && (function (f) {
          return function (node) {
              return function (a, b) {
                  var aobj = { key: a, value: node[a] };
                  var bobj = { key: b, value: node[b] };
                  return f(aobj, bobj);
              };
          };
      })(opts.cmp);
  
      var seen = [];
      return (function stringify (node) {
          if (node && node.toJSON && typeof node.toJSON === 'function') {
              node = node.toJSON();
          }
  
          if (node === undefined) return;
          if (typeof node == 'number') return isFinite(node) ? '' + node : 'null';
          if (typeof node !== 'object') return JSON.stringify(node);
  
          var i, out;
          if (Array.isArray(node)) {
              out = '[';
              for (i = 0; i < node.length; i++) {
                  if (i) out += ',';
                  out += stringify(node[i]) || 'null';
              }
              return out + ']';
          }
  
          if (node === null) return 'null';
  
          if (seen.indexOf(node) !== -1) {
              if (cycles) return JSON.stringify('__cycle__');
              throw new TypeError('Converting circular structure to JSON');
          }
  
          var seenIndex = seen.push(node) - 1;
          var keys = Object.keys(node).sort(cmp && cmp(node));
          out = '';
          for (i = 0; i < keys.length; i++) {
              var key = keys[i];
              var value = stringify(node[key]);
  
              if (!value) continue;
              if (out) out += ',';
              out += JSON.stringify(key) + ':' + value;
          }
          seen.splice(seenIndex, 1);
          return '{' + out + '}';
      })(data);
  };
  