add .removeFile(type, filename)

Author: tj

lib/builder.js

@@ -301,6 +301,26 @@ Builder.prototype.addFile = function(type, filename, val){
   this._files[filename] = val;
 };
 
+/**
+ * Add remove file `type` `filename` so it does not become
+ * part of the build output, for example when transpiling
+ * "list.styl" in the `.styles` array to "list.css", otherwise
+ * the contents of "list.styl" will become part of the output.
+ *
+ * @param {String} type
+ * @param {String} filename
+ * @param {String} val
+ * @return {Type}
+ * @api public
+ */
+
+Builder.prototype.removeFile = function(type, filename){
+  debug('remove %s "%s"', type, filename);
+  var files = this.conf[type] || (this.conf[type] = []);
+  var i = files.indexOf(filename);
+  if (~i) files.splice(i, 1);
+};
+
 /**
  * Append the given `str` of javascript.
  *