standardise native bold function too

index.js

@@ -1,15 +1,18 @@
 var client = require('client')
-  , colors = require('colors')
+  , colors = !client && require('colors')
+  , has = require('has')
+  , is = require('is')
 
 module.exports = colorfill()
 
 function colorfill(){
   /* istanbul ignore next */
-  client && ['red', 'green', 'bold', 'grey', 'strip'].forEach(function(color) {
-    ('')[color] !== '' && Object.defineProperty(String.prototype, color, {
-      get: function () {
+  ['red', 'green', 'bold', 'grey', 'strip'].forEach(function(color) {
+    !is.str(String.prototype[color]) && Object.defineProperty(String.prototype, color, {
+      get: function() {
         return String(this)
-      }
+      } 
     })
   })
 }
+

package.json

@@ -18,6 +18,8 @@
   },
   "dependencies": {
     "client": "git+https://github.com/utilise/client.git",
-    "colors": "^1.1.0"
+    "colors": "^1.1.0",
+    "has": "git+https://github.com/utilise/has.git",
+    "is": "git+https://github.com/utilise/is.git"
   }
 }

test.js

@@ -1,5 +1,4 @@
 var expect = require('chai').expect
-  , client = require('client')
   , colorfill = require('./')
 
 describe('colorfill', function() {