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server/node_modules/graphql/jsutils/orList.js.flow

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+/**
+ * Copyright (c) 2015-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
+ */
+
+const MAX_LENGTH = 5;
+
+/**
+ * Given [ A, B, C ] return 'A, B, or C'.
+ */
+export default function orList(items: $ReadOnlyArray<string>): string {
+  const selected = items.slice(0, MAX_LENGTH);
+  return selected.reduce(
+    (list, quoted, index) =>
+      list +
+      (selected.length > 2 ? ', ' : ' ') +
+      (index === selected.length - 1 ? 'or ' : '') +
+      quoted,
+  );
+}