fix(merge): handle undefined interfaces array on ObjectTypeDefinition…

…Node #2629
ardatan · May 11, 2021 · eae2879 · eae2879
1 parent 52971f4
commit eae2879
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Showing 2 changed files with 8 additions and 3 deletions.
diff --git a/.changeset/curvy-cups-help.md b/.changeset/curvy-cups-help.md
@@ -0,0 +1,5 @@
+---
+'@graphql-tools/merge': patch
+---
+
+fix(merge): handle undefined interfaces array on ObjectTypeDefinitionNode #2629
diff --git a/packages/merge/src/typedefs-mergers/merge-named-type-array.ts b/packages/merge/src/typedefs-mergers/merge-named-type-array.ts
@@ -7,9 +7,9 @@ function alreadyExists(arr: ReadonlyArray<NamedTypeNode>, other: NamedTypeNode):
 }
 
 export function mergeNamedTypeArray(
-  first: ReadonlyArray<NamedTypeNode>,
-  second: ReadonlyArray<NamedTypeNode>,
-  config: Config
+  first: ReadonlyArray<NamedTypeNode> = [],
+  second: ReadonlyArray<NamedTypeNode> = [],
+  config: Config = {}
 ): NamedTypeNode[] {
   const result = [...second, ...first.filter(d => !alreadyExists(second, d))];
   if (config && config.sort) {