From 1793f247ddc41f49c237c9d842fedb636123b288 Mon Sep 17 00:00:00 2001
From: Jeremy Walker <machineghost@gmail.com>
Date: Wed, 18 Mar 2020 10:41:39 -0700
Subject: [PATCH] Added resolver-returned value to the error object, plus
 further documentation on expected error fields (#590)

---
 README.md    | 6 ++++++
 src/index.js | 1 +
 2 files changed, 7 insertions(+)

diff --git a/README.md b/README.md
index 090932f8..21b42f2b 100644
--- a/README.md
+++ b/README.md
@@ -118,6 +118,12 @@ The `graphqlHTTP` function accepts the following options:
   errors produced by fulfilling a GraphQL operation. If no function is
   provided, GraphQL's default spec-compliant [`formatError`][] function will be used.
 
+  Although the fields on the error provided to this function may vary (based on the error type), they will typically include:
+  * **message:** the error message
+  * **locations:** the location(s) in the Javascript code where the error ocurred
+  * **path:** the path within the returned results where the error occurred (eg. in a schema violation error, the path to the part of the results that violated the schema)
+  * **result:** the value which was returned by the resolver (if any)
+
 - **`customParseFn`**: An optional function which will be used to create a document
   instead of the default `parse` from `graphql-js`.
 
diff --git a/src/index.js b/src/index.js
index 72f98371..8a757b45 100644
--- a/src/index.js
+++ b/src/index.js
@@ -368,6 +368,7 @@ function graphqlHTTP(options: Options): Middleware {
         }
         // Format any encountered errors.
         if (result && result.errors) {
+          (result: any).errors = result.errors.map(err => ({...err, result: result.data}));
           (result: any).errors = result.errors.map(formatErrorFn);
         }