feat: ignore, close #21

Author: Scrum

lib/index.js

@@ -5,13 +5,20 @@ module.exports = function (options) {
     options = {}
   }
 
+  if (!options.classIgnore) {
+    options.classIgnore = []
+  }
+
   if (options.replaceExtension === undefined) {
     options.replaceExtension = false
   }
 
   return function posthtmlWebp (tree) {
     tree.match([{ tag: 'img' }, { tag: 'amp-img' }], function (imgNode) {
       if (imgNode.skip) return imgNode
+      var classes = imgNode.attrs && imgNode.attrs.class && (imgNode.attrs.class.split(' ') || [])
+      var isIgnore = options.classIgnore.filter(className => classes.includes(className)).length > 0
+      if (isIgnore) return imgNode
       switch (imgNode.tag) {
         case 'amp-img':
           return getAmpPicture(imgNode, options)