feat(auth): implement user authentication system

backend/node_modules/prompts/lib/util/lines.js

@@ -0,0 +1,15 @@
+'use strict';
+
+const strip = require('./strip');
+
+/**
+ * @param {string} msg
+ * @param {number} perLine
+ */
+module.exports = function (msg, perLine) {
+  let lines = String(strip(msg) || '').split(/\r?\n/);
+
+  if (!perLine) return lines.length;
+  return lines.map(l => Math.ceil(l.length / perLine))
+      .reduce((a, b) => a + b);
+};