feat(meta): add twitter card, site and creator properties (#43)

Author: TheAlexLichter

docs/modules/meta.md

@@ -97,6 +97,19 @@ These types are accepted:
 - Default: ogHost (if defined)
 - Meta: `og:url`
 
+
+**twitterCard**
+- Default: `undefined`
+- Meta: `twitter:card
+
+**twitterSite**
+- Default: `undefined`
+- Meta: `twitter:site
+
+**twitterCreator**
+- Default: `undefined`
+- Meta: `twitter:creator`
+
 **nativeUI**
 - Default: `false`
 

packages/meta/index.js

@@ -35,7 +35,10 @@ function generateMeta (_options) {
     ogDescription: true,
     ogImage: true,
     ogHost: undefined,
-    ogUrl: true
+    ogUrl: true,
+    twitterCard: undefined,
+    twitterSite: undefined,
+    twitterCreator: undefined
   }
 
   // Combine sources
@@ -204,6 +207,21 @@ function generateMeta (_options) {
       debug('No host specified, skipping og:image')
     }
   }
+
+  // twitter:card
+  if (options.twitterCard && !find(this.options.head.meta, 'property', 'twitter:card') && !find(this.options.head.meta, 'name', 'twitter:card')) {
+    this.options.head.meta.push({ hid: 'twitter:card', name: 'twitter:card', property: 'twitter:card', content: options.twitterCard })
+  }
+
+  // twitter:site
+  if (options.twitterSite && !find(this.options.head.meta, 'property', 'twitter:site') && !find(this.options.head.meta, 'name', 'twitter:site')) {
+    this.options.head.meta.push({ hid: 'twitter:site', name: 'twitter:site', property: 'twitter:site', content: options.twitterSite })
+  }
+
+  // twitter:creator
+  if (options.twitterCreator && !find(this.options.head.meta, 'property', 'twitter:creator') && !find(this.options.head.meta, 'name', 'twitter:creator')) {
+    this.options.head.meta.push({ hid: 'twitter:creator', name: 'twitter:creator', property: 'twitter:creator', content: options.twitterCreator })
+  }
 }
 
 module.exports.meta = require('./package.json')