Fix babel parsing plugins (typescript)

extract.js

@@ -133,9 +133,16 @@ function loadBabelOpts (opts) {
 		if (Array.isArray(fileOpts[key]) && !fileOpts[key].length) {
 			continue;
 		}
-		// because some options need to be passed to parser also
+
 		opts[key] = fileOpts[key];
-		opts.parserOpts[key] = fileOpts[key];
+
+		if (Array.isArray(fileOpts[key]) && Array.isArray(opts.parserOpts[key])) {
+			// combine arrays for plugins
+			opts.parserOpts[key] = opts.parserOpts[key].concat(fileOpts[key]);
+		}	else {
+			// because some options need to be passed to parser also
+			opts.parserOpts[key] = fileOpts[key];
+		}
 	}
 	return opts;
 }