Fix transmitting errors through IPC

src/sharding/ShardClientUtil.js

@@ -1,4 +1,5 @@
 const makeError = require('../util/MakeError');
+const makePlainError = require('../util/MakePlainError');
 
 /**
  * Helper class for sharded clients spawned as a child process, such as from a ShardingManager
@@ -103,7 +104,7 @@ class ShardClientUtil {
       try {
         this._respond('eval', { _eval: message._eval, _result: this.client._eval(message._eval) });
       } catch (err) {
-        this._respond('eval', { _eval: message._eval, _error: err });
+        this._respond('eval', { _eval: message._eval, _error: makePlainError(err) });
       }
     }
   }

src/sharding/ShardingManager.js

@@ -4,6 +4,7 @@ const EventEmitter = require('events').EventEmitter;
 
 const Shard = require('./Shard');
 const Collection = require('../util/Collection');
+const makePlainError = require('../util/MakePlainError');
 
 /**
  * This is a utility class that can be used to help you spawn shards of your Client. Each shard is completely separate
@@ -58,11 +59,11 @@ class ShardingManager extends EventEmitter {
       if (message._sFetchProp) {
         this.fetchClientValues(message._sFetchProp)
           .then(results => shard.send({ _sFetchProp: message._sFetchProp, _result: results }))
-          .catch(err => shard.send({ _sFetchProp: message._sFetchProp, _error: err }));
+          .catch(err => shard.send({ _sFetchProp: message._sFetchProp, _error: makePlainError(err) }));
       } else if (message._sEval) {
         this.broadcastEval(message._sEval)
           .then(results => shard.send({ _sEval: message._sEval, _result: results }))
-          .catch(err => shard.send({ _sEval: message._sEval, _error: err }));
+          .catch(err => shard.send({ _sEval: message._sEval, _error: makePlainError(err) }));
       }
     });
   }

src/util/MakeError.js

@@ -1,7 +1,6 @@
 module.exports = function makeError(obj) {
-  const err = new Error(obj.message, obj.fileName, obj.lineNumber);
+  const err = new Error(obj.message);
   err.name = obj.name;
-  err.columnNumber = obj.columnNumber;
   err.stack = obj.stack;
   return err;
 };

src/util/MakePlainError.js

@@ -0,0 +1,7 @@
+module.exports = function makePlainError(err) {
+  const obj = {};
+  obj.name = err.name;
+  obj.message = err.message;
+  obj.stack = err.stack;
+  return obj;
+};