Better cycles detection

Author: Kikobeats

lib/index.js

@@ -28,6 +28,9 @@ function stringifyDeterministic (obj, opts = DEFAULTS) {
     }
   })(opts.compare)
 
+  // Detect circular structure in obj and raise error efficiently.
+  if (!cycles) stringify(obj)
+
   const seen = []
 
   return (function _deterministic (parent, key, node, level) {
@@ -49,11 +52,12 @@ function stringifyDeterministic (obj, opts = DEFAULTS) {
       }
       return '[' + out.join(',') + indent + ']'
     } else {
-      if (seen.indexOf(node) !== -1) {
-        if (cycles) return stringify('[Circular]')
-        throw new TypeError('Converting circular structure to JSON')
-      } else {
-        seen.push(node)
+      if (cycles) {
+        if (seen.indexOf(node) !== -1) {
+          return stringify('[Circular]')
+        } else {
+          seen.push(node)
+        }
       }
 
       const nodeKeys = keys(node).sort(compare && compare(node))