From 988e4ebb7056c9405aa1dd99e692b85ed6c01389 Mon Sep 17 00:00:00 2001
From: Mikhail Novikov <freiksenet@gmail.com>
Date: Mon, 12 Feb 2018 15:17:53 +0200
Subject: [PATCH] Don't use Symbol if you can't (#631)

---
 CHANGELOG.md            |  1 +
 src/stitching/errors.ts | 26 ++++++++++++++++++--------
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad7d4168f89..0df90ca4bc2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 * Make iterall a runtime dependency [PR #627](https://github.com/apollographql/graphql-tools/pull/627)
 * Added support for lexical parser options [PR #567](https://github.com/apollographql/graphql-tools/pull/567)
 * Support `graphql@^0.13.0` [PR #567](https://github.com/apollographql/graphql-tools/pull/567)
+* Don't use `Symbol` in incompatible envs [Issue #535](https://github.com/apollographql/graphql-tools/issues/535) [PR #631](https://github.com/apollographql/graphql-tools/pull/631)
 
 ### v2.20.2
 
diff --git a/src/stitching/errors.ts b/src/stitching/errors.ts
index 720345d6e87..3af0dc609e1 100644
--- a/src/stitching/errors.ts
+++ b/src/stitching/errors.ts
@@ -1,7 +1,15 @@
 import { GraphQLResolveInfo, responsePathAsArray } from 'graphql';
 import { locatedError } from 'graphql/error';
 
-const ERROR_SYMBOL = Symbol('subSchemaErrors');
+let ERROR_SYMBOL: any;
+if (
+  (typeof global !== 'undefined' && 'Symbol' in global) ||
+  (typeof window !== 'undefined' && 'Symbol' in window)
+) {
+  ERROR_SYMBOL = Symbol('subSchemaErrors');
+} else {
+  ERROR_SYMBOL = '@@__subSchemaErrors';
+}
 
 export function annotateWithChildrenErrors(
   object: any,
@@ -11,7 +19,9 @@ export function annotateWithChildrenErrors(
     if (Array.isArray(object)) {
       const byIndex = {};
       childrenErrors.forEach(error => {
-        if (!error.path) { return; }
+        if (!error.path) {
+          return;
+        }
         const index = error.path[1];
         const current = byIndex[index] || [];
         current.push({
@@ -28,7 +38,7 @@ export function annotateWithChildrenErrors(
         ...object,
         [ERROR_SYMBOL]: childrenErrors.map(error => ({
           ...error,
-          ...(error.path ? { path: error.path.slice(1) } : {}),
+          ...error.path ? { path: error.path.slice(1) } : {},
         })),
       };
     }
@@ -81,8 +91,10 @@ export function checkResultAndHandleErrors(
     // apollo-link-http & http-link-dataloader need the
     // result property to be passed through for better error handling.
     // If there is only one error, which contains a result property, pass the error through
-    const newError = result.errors.length === 1 && hasResult(result.errors[0])
-      ? result.errors[0] : new Error(concatErrors(result.errors));
+    const newError =
+      result.errors.length === 1 && hasResult(result.errors[0])
+        ? result.errors[0]
+        : new Error(concatErrors(result.errors));
 
     throw locatedError(
       newError,
@@ -102,9 +114,7 @@ export function checkResultAndHandleErrors(
 }
 
 function concatErrors(errors: Error[]) {
-  return errors
-    .map(error => error.message)
-    .join('\n');
+  return errors.map(error => error.message).join('\n');
 }
 
 function hasResult(error: any) {