Initialisation

Added the packages and files for the backend server

node_modules/graphql/jsutils/keyValMap.mjs

@@ -0,0 +1,26 @@
+/**
+ * Creates a keyed JS object from an array, given a function to produce the keys
+ * and a function to produce the values from each item in the array.
+ * ```ts
+ * const phoneBook = [
+ *   { name: 'Jon', num: '555-1234' },
+ *   { name: 'Jenny', num: '867-5309' }
+ * ]
+ *
+ * // { Jon: '555-1234', Jenny: '867-5309' }
+ * const phonesByName = keyValMap(
+ *   phoneBook,
+ *   entry => entry.name,
+ *   entry => entry.num
+ * )
+ * ```
+ */
+export function keyValMap(list, keyFn, valFn) {
+  const result = Object.create(null);
+
+  for (const item of list) {
+    result[keyFn(item)] = valFn(item);
+  }
+
+  return result;
+}