Prepare stream as extension

Author: o-rumiantsev

lib/stream.js

@@ -1,7 +1,11 @@
 'use strict';
 
-const extend = parser => {
+const mixinMethods = parser => {};
 
+function stream() {
+  mixinMethods(this);
+  this.stream = true;
+  return this
 };
 
-module.exports = extend;
+module.exports = stream;

schemaparser.js

@@ -7,12 +7,6 @@ const extensions = {
   stream: require('./lib/stream.js')
 };
 
-Parser.prototype.extend = function(
-  extensionName
-) {
-  const extension = extensions[extensionName];
-  extension(this);
-  return this;
-};
+Object.assign(Parser.prototype, extensions);
 
 module.exports = Parser;