Use iframe-resizer via npm

config/paths.json

@@ -2,7 +2,9 @@
   "config": "config/",
   "deploy": "deploy",
     "public": "deploy/public/",
-  "govukfrontend": "node_modules/@govuk-frontend/",
+  "nodemodules": "node_modules/",
+    "govukfrontend": "node_modules/@govuk-frontend/",
+    "iframeresizer": "node_modules/iframe-resizer/",
   "source": "src/",
     "components": "src/components/",
     "images": "src/images/",

lib/metalsmith.js

@@ -44,18 +44,24 @@ module.exports = metalsmith(__dirname) // __dirname defined by node.js: name of
     includePaths: ['node_modules'] // an array of paths that sass can look in when attempt to resolve @import declarations
   }))
 
-  // copy static assets from node_modules
+  // copy static assets from node_modules/@govukfrontend
   .use(assets({
     source: '../' + paths.govukfrontend + 'icons/',
     destination: 'icons'
   }))
 
+  // copy static assets from node_modules/iframe-resizer
+  .use(assets({
+    source: '../' + paths.iframeresizer + 'js/',
+    destination: 'javascripts/vendor'
+  }))
+
   // concatenate javascript files
   .use(concat({
     files: [
       'javascripts/vendor/jquery.js',
       'javascripts/vendor/clipboard.js',
-      'javascripts/vendor/iframeResizer.js',
+      'javascripts/vendor/iframeResizer.min.js',
       'javascripts/components/example.js',
       'javascripts/components/tabs.js',
       'javascripts/components/copy.js',
@@ -68,7 +74,7 @@ module.exports = metalsmith(__dirname) // __dirname defined by node.js: name of
   .use(concat({
     files: [
       'javascripts/vendor/html5shiv-printshiv.js',
-      'javascripts/vendor/iframeResizer.ie8.polyfils.js',
+      'javascripts/vendor/ie8.polyfils.min.js',
       'javascripts/ie-only.js'
     ],
     output: 'javascripts/ie.js'

package.json

@@ -23,6 +23,7 @@
   "devDependencies": {
     "gulp": "^3.9.1",
     "gulp-sass-lint": "^1.3.4",
+    "iframe-resizer": "^3.5.15",
     "jstransformer-markdown": "^1.2.1",
     "jstransformer-nunjucks": "^0.5.0",
     "metalsmith": "^2.3.0",