fix(error-handling): If an error contains a code or requestId property, pass it through

Author: timsuchanek

src/defaultErrorFormatter.ts

@@ -0,0 +1,32 @@
+import { formatError } from 'graphql'
+import { GraphQLFormattedError } from 'graphql/error/formatError'
+
+export interface PrismaErrorProps {
+  code?: number
+  requestId?: string
+}
+
+export function defaultErrorFormatter(
+  error,
+): GraphQLFormattedError & PrismaErrorProps {
+  const data: GraphQLFormattedError & PrismaErrorProps = formatError(error)
+
+  if (
+    error.originalError &&
+    error.originalError.result &&
+    error.originalError.result.errors &&
+    error.originalError.result.errors.length === 1
+  ) {
+    const originalError = error.originalError.result.errors[0]
+    if (originalError.message === error.message) {
+      if (originalError.code) {
+        data.code = originalError.code
+      }
+      if (originalError.requestId) {
+        data.requestId = originalError.requestId
+      }
+    }
+  }
+
+  return data
+}

src/index.ts

@@ -18,6 +18,7 @@ import * as path from 'path'
 import { SubscriptionServer } from 'subscriptions-transport-ws'
 
 import { Options, Props } from './types'
+import { defaultErrorFormatter } from './defaultErrorFormatter';
 
 export { PubSub, withFilter } from 'graphql-subscriptions'
 export { Options }
@@ -192,7 +193,7 @@ export class GraphQLServer {
           schema: this.executableSchema,
           tracing: tracing(request),
           cacheControl: this.options.cacheControl,
-          formatError: this.options.formatError,
+          formatError: this.options.formatError || defaultErrorFormatter,
           logFunction: this.options.logFunction,
           rootValue: this.options.rootValue,
           validationRules: this.options.validationRules,