Make json-stringify-safe IE8 compatible

Author: LewisJEllis

vendor/json-stringify-safe/stringify.js

@@ -1,6 +1,26 @@
+'use strict';
+
+/*
+ json-stringify-safe
+ Like JSON.stringify, but doesn't throw on circular references.
+
+ Originally forked from https://github.com/isaacs/json-stringify-safe
+ version 5.0.1 on 3/8/2017 and modified for IE8 compatibility.
+ Tests for this are in test/vendor.
+
+ ISC license: https://github.com/isaacs/json-stringify-safe/blob/master/LICENSE
+*/
+
 exports = module.exports = stringify
 exports.getSerialize = serializer
 
+function indexOf(haystack, needle) {
+  for (var i = 0; i < haystack.length; ++i) {
+    if (haystack[i] === needle) return i;
+  }
+  return -1;
+}
+
 function stringify(obj, replacer, spaces, cycleReplacer) {
   return JSON.stringify(obj, serializer(replacer, cycleReplacer), spaces)
 }
@@ -9,19 +29,19 @@ function serializer(replacer, cycleReplacer) {
   var stack = [], keys = []
 
   if (cycleReplacer == null) cycleReplacer = function(key, value) {
-    if (stack[0] === value) return "[Circular ~]"
-    return "[Circular ~." + keys.slice(0, stack.indexOf(value)).join(".") + "]"
+    if (stack[0] === value) return '[Circular ~]'
+    return '[Circular ~.' + keys.slice(0, indexOf(stack, value)).join('.') + ']'
   }
 
   return function(key, value) {
     if (stack.length > 0) {
-      var thisPos = stack.indexOf(this)
+      var thisPos = indexOf(stack, this);
       ~thisPos ? stack.splice(thisPos + 1) : stack.push(this)
       ~thisPos ? keys.splice(thisPos, Infinity, key) : keys.push(key)
-      if (~stack.indexOf(value)) value = cycleReplacer.call(this, key, value)
+      if (~indexOf(stack, value)) value = cycleReplacer.call(this, key, value)
     }
     else stack.push(value)
 
     return replacer == null ? value : replacer.call(this, key, value)
   }
-}
+}