diff --git a/lib/escape-helper.coffee b/lib/escape-helper.coffee
deleted file mode 100644
index dee777f0..00000000
--- a/lib/escape-helper.coffee
+++ /dev/null
@@ -1,13 +0,0 @@
-module.exports =
-  unescapeEscapeSequence: (string) ->
-    string.replace /\\(.)/gm, (match, char) ->
-      if char is 't'
-        '\t'
-      else if char is 'n'
-        '\n'
-      else if char is 'r'
-        '\r'
-      else if char is '\\'
-        '\\'
-      else
-        match
diff --git a/lib/escape-helper.js b/lib/escape-helper.js
new file mode 100644
index 00000000..181a4edd
--- /dev/null
+++ b/lib/escape-helper.js
@@ -0,0 +1,17 @@
+module.exports = {
+  unescapeEscapeSequence(string) {
+    return string.replace(/\\(.)/gm, function(match, char) {
+      if (char === 't') {
+        return '\t';
+      } else if (char === 'n') {
+        return '\n';
+      } else if (char === 'r') {
+        return '\r';
+      } else if (char === '\\') {
+        return '\\';
+      } else {
+        return match;
+      }
+    });
+  }
+};