diff --git a/src/js/parser/javascript/match.js b/src/js/parser/javascript/match.js
index 5e07243..442de8f 100644
--- a/src/js/parser/javascript/match.js
+++ b/src/js/parser/javascript/match.js
@@ -2,4 +2,5 @@ import _ from 'lodash';
 import Base from './base.js';
 
 export default _.extend({}, Base, {
+  type: 'match',
 });
diff --git a/src/js/parser/javascript/regexp.js b/src/js/parser/javascript/regexp.js
index 9b08a0d..17834eb 100644
--- a/src/js/parser/javascript/regexp.js
+++ b/src/js/parser/javascript/regexp.js
@@ -2,6 +2,8 @@ import _ from 'lodash';
 import Base from './base.js';
 
 export default _.extend({}, Base, {
+  type: 'regexp',
+
   render(container) {
     this.container = container;
     this.contents = _.map(this.matches(), match => {
diff --git a/src/js/parser/javascript/root.js b/src/js/parser/javascript/root.js
index 960ec31..1fa1482 100644
--- a/src/js/parser/javascript/root.js
+++ b/src/js/parser/javascript/root.js
@@ -2,6 +2,8 @@ import _ from 'lodash';
 import Base from './base.js';
 
 export default _.extend({}, Base, {
+  type: 'root',
+
   render(container) {
     this.contents = container.group();