add login/sign-up page with dark/light mode

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

@@ -0,0 +1,14 @@
+'use strict';
+
+/**
+ * Logs out a message if there is no format option set.
+ * @param {string} message - Message to log.
+ */
+function error(message) {
+  if (!/=-(f|-format)=/.test(process.argv.join('='))) {
+    // eslint-disable-next-line no-console
+    console.error(message);
+  }
+}
+
+module.exports = error;