feat(auth): implement user authentication system

backend/node_modules/prompts/dist/dateparts/datepart.js

@@ -0,0 +1,39 @@
+'use strict';
+
+class DatePart {
+  constructor({
+    token,
+    date,
+    parts,
+    locales
+  }) {
+    this.token = token;
+    this.date = date || new Date();
+    this.parts = parts || [this];
+    this.locales = locales || {};
+  }
+
+  up() {}
+
+  down() {}
+
+  next() {
+    const currentIdx = this.parts.indexOf(this);
+    return this.parts.find((part, idx) => idx > currentIdx && part instanceof DatePart);
+  }
+
+  setTo(val) {}
+
+  prev() {
+    let parts = [].concat(this.parts).reverse();
+    const currentIdx = parts.indexOf(this);
+    return parts.find((part, idx) => idx > currentIdx && part instanceof DatePart);
+  }
+
+  toString() {
+    return String(this.date);
+  }
+
+}
+
+module.exports = DatePart;