add all frontend files

node_modules/eslint-plugin-react/lib/util/isFirstLetterCapitalized.js

@@ -0,0 +1,14 @@
+'use strict';
+
+/**
+ * Check if the first letter of a string is capitalized.
+ * @param {string} word String to check
+ * @returns {boolean} True if first letter is capitalized.
+ */
+module.exports = function isFirstLetterCapitalized(word) {
+  if (!word) {
+    return false;
+  }
+  const firstLetter = word.replace(/^_+/, '').charAt(0);
+  return firstLetter.toUpperCase() === firstLetter;
+};