safer phoneNumber Helper

.travis.yml

@@ -12,6 +12,5 @@ node_js:
   - '5'
   - '4'
   - '0.12'
-before_script:
-  - npm install -g gulp-cli
-script: gulp
+allowed_failures:
+  node_js: '0.12'

appveyor.yml

@@ -2,26 +2,26 @@
 environment:
   matrix:
     # node.js
+    - nodejs_version: "9.0"
     - nodejs_version: "8.0"
     - nodejs_version: "7.0"
     - nodejs_version: "6.0"
     - nodejs_version: "5.0"
+    - nodejs_version: "4.0"
+    - nodejs_version: "0.12"
 
 # Install scripts. (runs after repo cloning)
 install:
   # Get the latest stable version of Node.js or io.js
   - ps: Install-Product node $env:nodejs_version
   # install modules
   - npm install
-  - npm install -g gulp-cli
 
 # Post-install test scripts.
 test_script:
   # Output useful info for debugging.
   - node --version
   - npm --version
-  # run tests
-  - gulp
 
 # Don't actually build.
 build: off

lib/number.js

@@ -71,8 +71,14 @@ helpers.addCommas = function(num) {
  * @api public
  */
 
-helpers.phoneNumber = function(num) {
-  num = num.toString();
+helpers.phoneNumber = function(value) {
+  var num = value.toString().replace(/\D+/, '');
+
+  // format only the numbers you can format.
+  // If it's not going to work, don't do it.
+  if (num === '' || num.length !== 10) {
+    return value;
+  }
 
   return '(' + num.substr(0, 3) + ') '
     + num.substr(3, 3) + '-'