diff --git a/index.js b/index.js
index 1ee3a66..5958f85 100644
--- a/index.js
+++ b/index.js
@@ -2,6 +2,7 @@
 
 exports.object = require('./object');
 exports.array = require('./array');
+exports.string = require('./string');
 exports.func = require('./function');
 exports.functionThatReturns = require('./functionThatReturns');
 exports.functionThatReturnsTrue = require('./functionThatReturnsTrue');
diff --git a/string.js b/string.js
new file mode 100644
index 0000000..8d760c7
--- /dev/null
+++ b/string.js
@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = '';
+
+if ('production' != process.env.NODE_ENV) {
+  Object.freeze(module.exports);
+}