lib: add missing `new` for errors lib/*.js

Not including `new` adds a useless frame and removes a potentially
useful frame.

PR-URL: https://github.com/iojs/io.js/pull/1246
Reviewed-By: Petka Antonov <petka_antonov@hotmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Brendan Ashworth <brendan.ashworth@me.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/dns.js b/lib/dns.js
index 4572d253f1..d39eec878e 100644
--- a/lib/dns.js
+++ b/lib/dns.js
@@ -108,12 +108,13 @@ exports.lookup = function lookup(hostname, options, callback) {
 
   // Parse arguments
   if (hostname && typeof hostname !== 'string') {
-    throw TypeError('invalid arguments: hostname must be a string or falsey');
+    throw new TypeError('invalid arguments: ' +
+                        'hostname must be a string or falsey');
   } else if (typeof options === 'function') {
     callback = options;
     family = 0;
   } else if (typeof callback !== 'function') {
-    throw TypeError('invalid arguments: callback must be passed');
+    throw new TypeError('invalid arguments: callback must be passed');
   } else if (options !== null && typeof options === 'object') {
     hints = options.hints >>> 0;
     family = options.family >>> 0;