Initialisation

Added the packages and files for the backend server

node_modules/graphql/jsutils/groupBy.mjs

@@ -0,0 +1,19 @@
+/**
+ * Groups array items into a Map, given a function to produce grouping key.
+ */
+export function groupBy(list, keyFn) {
+  const result = new Map();
+
+  for (const item of list) {
+    const key = keyFn(item);
+    const group = result.get(key);
+
+    if (group === undefined) {
+      result.set(key, [item]);
+    } else {
+      group.push(item);
+    }
+  }
+
+  return result;
+}