Adds .d.ts extension

Author: alexgorbatchev

index.js

@@ -3,7 +3,7 @@ const path = require('path');
 
 function opts(file, config) {
   return Object.assign(
-    { extensions: ['.ts', '.tsx'] },
+    { extensions: ['.ts', '.tsx', '.d.ts'] },
     config,
     // path.resolve will handle paths relative to CWD
     { basedir: path.dirname(path.resolve(file)) }