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server/node_modules/graphql/subscription/asyncIteratorReject.js.flow

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+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict
+ */
+
+import { $$asyncIterator } from 'iterall';
+
+/**
+ * Given an error, returns an AsyncIterable which will fail with that error.
+ *
+ * Similar to Promise.reject(error)
+ */
+export default function asyncIteratorReject(error: Error): AsyncIterator<void> {
+  let isComplete = false;
+  /* TODO: Flow doesn't support symbols as keys:
+     https://github.com/facebook/flow/issues/3258 */
+  return ({
+    next() {
+      const result = isComplete
+        ? Promise.resolve({ value: undefined, done: true })
+        : Promise.reject(error);
+      isComplete = true;
+      return result;
+    },
+    return() {
+      isComplete = true;
+      return Promise.resolve({ value: undefined, done: true });
+    },
+    throw() {
+      isComplete = true;
+      return Promise.reject(error);
+    },
+    [$$asyncIterator]() {
+      return this;
+    },
+  }: any);
+}