feat(auth): implement user authentication system

backend/node_modules/mysql2/lib/results_stream.js

@@ -0,0 +1,38 @@
+'use strict';
+
+const Readable = require('stream').Readable;
+
+// copy-paste from https://github.com/mysqljs/mysql/blob/master/lib/protocol/sequences/Query.js
+module.exports = function (command, connectionStream) {
+  command.stream = function (options) {
+    let stream;
+
+    options = options || {};
+    options.objectMode = true;
+    ((stream = new Readable(options)),
+      (stream._read = function () {
+        connectionStream.resume();
+      }));
+
+    this.on('result', (row, i) => {
+      if (!stream.push(row)) {
+        connectionStream.pause();
+      }
+      stream.emit('result', row, i); // replicate old emitter
+    });
+
+    this.on('error', (err) => {
+      stream.emit('error', err); // Pass on any errors
+    });
+
+    this.on('end', () => {
+      stream.push(null); // pushing null, indicating EOF
+    });
+
+    this.on('fields', (fields, i) => {
+      stream.emit('fields', fields, i); // replicate old emitter
+    });
+
+    return stream;
+  };
+};