Initialisation

Added the packages and files for the backend server

node_modules/graphql/execution/mapAsyncIterator.mjs

@@ -0,0 +1,61 @@
+/**
+ * Given an AsyncIterable and a callback function, return an AsyncIterator
+ * which produces values mapped via calling the callback function.
+ */
+export function mapAsyncIterator(iterable, callback) {
+  const iterator = iterable[Symbol.asyncIterator]();
+
+  async function mapResult(result) {
+    if (result.done) {
+      return result;
+    }
+
+    try {
+      return {
+        value: await callback(result.value),
+        done: false,
+      };
+    } catch (error) {
+      /* c8 ignore start */
+      // FIXME: add test case
+      if (typeof iterator.return === 'function') {
+        try {
+          await iterator.return();
+        } catch (_e) {
+          /* ignore error */
+        }
+      }
+
+      throw error;
+      /* c8 ignore stop */
+    }
+  }
+
+  return {
+    async next() {
+      return mapResult(await iterator.next());
+    },
+
+    async return() {
+      // If iterator.return() does not exist, then type R must be undefined.
+      return typeof iterator.return === 'function'
+        ? mapResult(await iterator.return())
+        : {
+            value: undefined,
+            done: true,
+          };
+    },
+
+    async throw(error) {
+      if (typeof iterator.throw === 'function') {
+        return mapResult(await iterator.throw(error));
+      }
+
+      throw error;
+    },
+
+    [Symbol.asyncIterator]() {
+      return this;
+    },
+  };
+}