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node_modules/serialize-javascript/index.js

@@ -11,8 +11,11 @@ var UID                 = Math.floor(Math.random() * 0x10000000000).toString(16)
 var PLACE_HOLDER_REGEXP = new RegExp('"@__(F|R|D)-' + UID + '-(\\d+)__@"', 'g');
 
 var IS_NATIVE_CODE_REGEXP = /\{\s*\[native code\]\s*\}/g;
+var IS_PURE_FUNCTION = /function.*?\(/;
 var UNSAFE_CHARS_REGEXP   = /[<>\/\u2028\u2029]/g;
 
+var RESERVED_SYMBOLS = ['*', 'async'];
+
 // Mapping of unsafe HTML and invalid JavaScript line terminator chars to their
 // Unicode char counterparts which are safe to use in JavaScript strings.
 var ESCAPED_CHARS = {
@@ -68,6 +71,38 @@ module.exports = function serialize(obj, options) {
         return value;
     }
 
+    function serializeFunc(fn) {
+      var serializedFn = fn.toString();
+      if (IS_NATIVE_CODE_REGEXP.test(serializedFn)) {
+          throw new TypeError('Serializing native function: ' + fn.name);
+      }
+
+      // pure functions, example: {key: function() {}}
+      if(IS_PURE_FUNCTION.test(serializedFn)) {
+          return serializedFn;
+      }
+
+      var argsStartsAt = serializedFn.indexOf('(');
+      var def = serializedFn.substr(0, argsStartsAt)
+        .trim()
+        .split(' ')
+        .filter(function(val) { return val.length > 0 });
+
+      var nonReservedSymbols = def.filter(function(val) {
+        return RESERVED_SYMBOLS.indexOf(val) === -1
+      });
+
+      // enhanced literal objects, example: {key() {}}
+      if(nonReservedSymbols.length > 0) {
+          return (def.indexOf('async') > -1 ? 'async ' : '') + 'function'
+            + (def.join('').indexOf('*') > -1 ? '*' : '')
+            + serializedFn.substr(argsStartsAt);
+      }
+
+      // arrow functions
+      return serializedFn;
+    }
+
     var str;
 
     // Creates a JSON string representation of the value.
@@ -108,12 +143,7 @@ module.exports = function serialize(obj, options) {
         }
 
         var fn           = functions[valueIndex];
-        var serializedFn = fn.toString();
 
-        if (IS_NATIVE_CODE_REGEXP.test(serializedFn)) {
-            throw new TypeError('Serializing native function: ' + fn.name);
-        }
-
-        return serializedFn;
+        return serializeFunc(fn);
     });
 }