Modularize master branch.

_stringSize.js

@@ -0,0 +1,18 @@
+import asciiSize from './_asciiSize.js';
+import hasUnicode from './_hasUnicode.js';
+import unicodeSize from './_unicodeSize.js';
+
+/**
+ * Gets the number of symbols in `string`.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {number} Returns the string size.
+ */
+function stringSize(string) {
+  return hasUnicode(string)
+    ? unicodeSize(string)
+    : asciiSize(string);
+}
+
+export default stringSize;