Initialisation

Added the packages and files for the backend server

node_modules/graphql/jsutils/promiseReduce.mjs

@@ -0,0 +1,20 @@
+import { isPromise } from './isPromise.mjs';
+
+/**
+ * Similar to Array.prototype.reduce(), however the reducing callback may return
+ * a Promise, in which case reduction will continue after each promise resolves.
+ *
+ * If the callback does not return a Promise, then this function will also not
+ * return a Promise.
+ */
+export function promiseReduce(values, callbackFn, initialValue) {
+  let accumulator = initialValue;
+
+  for (const value of values) {
+    accumulator = isPromise(accumulator)
+      ? accumulator.then((resolved) => callbackFn(resolved, value))
+      : callbackFn(accumulator, value);
+  }
+
+  return accumulator;
+}