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server/node_modules/graphql/error/formatError.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
+ */
+
+import invariant from '../jsutils/invariant';
+import type { GraphQLError } from './GraphQLError';
+import type { SourceLocation } from '../language/location';
+
+/**
+ * Given a GraphQLError, format it according to the rules described by the
+ * Response Format, Errors section of the GraphQL Specification.
+ */
+export function formatError(error: GraphQLError): GraphQLFormattedError {
+  invariant(error, 'Received null or undefined error.');
+  const message = error.message || 'An unknown error occurred.';
+  const locations = error.locations;
+  const path = error.path;
+  const extensions = error.extensions;
+
+  return extensions
+    ? { message, locations, path, extensions }
+    : { message, locations, path };
+}
+
+export type GraphQLFormattedError = {|
+  +message: string,
+  +locations: $ReadOnlyArray<SourceLocation> | void,
+  +path: $ReadOnlyArray<string | number> | void,
+  +extensions?: { [key: string]: mixed },
+|};