*properly

When using shorthand to define a function as a method in an object literal, serialization assigns a named function expression, which fails to evaluate.

$ var testSer = {  fn1: function(a) { console.log(a); return this; }, fn2: (d) => { console.log(d); return this; }, fn3(r) { console.log(r); return this; } };

Validate the functions first:

 test 1
{ fn1: [Function], fn2: [Function], fn3: [Function: fn3] }

$ testSer.fn2('test 2')

test 2
<context>

$ testSer.fn3('test 3')

test 3
{ fn1: [Function], fn2: [Function], fn3: [Function: fn3] }

Do the serialization:

$ ca
'{"fn1":function (a) { console.log(a); return this; },"fn2":(d) => { console.log(d); return this; },"fn3":fn3(r) { console.log(r); return this;  }}'

Note how it has created a "fn3" entry as a named function, but has neglected to add the function keyword.

Now try to eval:

$ var c = eval('('+ca+')');

SyntaxError: Unexpected token {
  at repl:1:20
  at REPLServer.defaultEval (repl.js:262:27)
  at bound (domain.js:287:14)
  at REPLServer.runBound [as eval] (domain.js:300:12)
  at REPLServer.<anonymous> (repl.js:431:12)
  at emitOne (events.js:82:20)
  at REPLServer.emit (events.js:169:7)
  at REPLServer.Interface._onLine (readline.js:211:10)
  at REPLServer.Interface._line (readline.js:550:8)
  at REPLServer.Interface._ttyWrite (readline.js:827:14)
  at ReadStream.onkeypress (readline.js:106:10)
  at emitTwo (events.js:87:13)
  at ReadStream.emit (events.js:172:7)
  at emitKeys (readline.js:1251:14)
  at next (native)
  at ReadStream.onData (readline.js:919:36)
  at emitOne (events.js:77:13)
  at ReadStream.emit (events.js:169:7)
  at readableAddChunk (_stream_readable.js:153:18)
  at ReadStream.Readable.push (_stream_readable.js:111:10)
  at TTY.onread (net.js:531:20)

All it needs to do is add the function keyword:

'{"fn1":function (a) { console.log(a); return this; },"fn2":(d) => { console.log(d); return this; },"fn3": function fn3(r) { console.log(r); return this;  }}'

Node version:

$ node -v
  v4.4.3