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diff --git a/node_modules/underscore.string/ltrim.js b/node_modules/underscore.string/ltrim.js
new file mode 100644
index 000000000..858936e4c
--- /dev/null
+++ b/node_modules/underscore.string/ltrim.js
@@ -0,0 +1,10 @@
+var makeString = require('./helper/makeString');
+var defaultToWhiteSpace = require('./helper/defaultToWhiteSpace');
+var nativeTrimLeft = String.prototype.trimLeft;
+
+module.exports = function ltrim(str, characters) {
+  str = makeString(str);
+  if (!characters && nativeTrimLeft) return nativeTrimLeft.call(str);
+  characters = defaultToWhiteSpace(characters);
+  return str.replace(new RegExp('^' + characters + '+'), '');
+};