'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 < _AN_Read_length('length', node); 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 < _AN_Read_length('length', keys); 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); 
} 
;