feat: add removeUnfound class/id/attrs, close #44, close #34

Author: Scrum

lib/index.js

@@ -5,14 +5,15 @@ const selectorParser = require('postcss-selector-parser');
 const nameGenerators = require('./name-generators');
 
 class MinifyClassnames {
-  constructor({genNameClass, genNameId, filter, customAttributes = []} = {}) {
+  constructor({genNameClass, genNameId, filter, customAttributes = [], removeUnfound = true} = {}) {
     this.filter = filter || /^.js-/;
     // TODO: Pass a seed for emojinamestring, make this better
     this.genNameClass = this.getNameGenerator(genNameClass, 7);
     this.genNameId = this.getNameGenerator(genNameId, 5);
     this.classMap = {};
     this.idMap = {};
     this.customAttributes = customAttributes;
+    this.removeUnfound = removeUnfound;
   }
 
   getNameGenerator(value, seed) {
@@ -75,7 +76,7 @@ class MinifyClassnames {
                   return value;
                 }
 
-                return this.classMap[value] || '';
+                return this.classMap[value] || (this.removeUnfound ? '' : value);
               })
               .filter(Boolean)
               .join(' ')
@@ -93,7 +94,7 @@ class MinifyClassnames {
               return value;
             }
 
-            return this.classMap[value] || '';
+            return this.classMap[value] || (this.removeUnfound ? '' : value);
           })
           .filter(Boolean)
           .join(' ')
@@ -109,11 +110,11 @@ class MinifyClassnames {
               return value;
             }
 
-            if (!this.idMap[value]) {
+            if (!this.idMap[value] && this.removeUnfound) {
               this.idMap[value] = this.genNameId.next().value;
             }
 
-            return this.idMap[value];
+            return this.idMap[value] || (this.removeUnfound ? '' : value);
           })
           .join(' ');
       }