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node_modules/graphql/jsutils/promiseReduce.mjs

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+import isPromise from './isPromise';
+
+/**
+ * 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 default function promiseReduce(values, callback, initialValue) {
+  return values.reduce(function (previous, value) {
+    return isPromise(previous) ? previous.then(function (resolved) {
+      return callback(resolved, value);
+    }) : callback(previous, value);
+  }, initialValue);
+}