From 048300491777c030ab12abea85e92a6896f71c0f Mon Sep 17 00:00:00 2001
From: Arda TANRIKULU <ardatanrikulu@gmail.com>
Date: Wed, 4 Aug 2021 12:05:35 +0300
Subject: [PATCH] fix(utils): support old TypeScript versions

---
 .changeset/old-forks-think.md        |  5 +++++
 packages/utils/src/AggregateError.ts | 14 ++++++++++++--
 2 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/old-forks-think.md

diff --git a/.changeset/old-forks-think.md b/.changeset/old-forks-think.md
new file mode 100644
index 00000000000..0a064650ff2
--- /dev/null
+++ b/.changeset/old-forks-think.md
@@ -0,0 +1,5 @@
+---
+'@graphql-tools/utils': patch
+---
+
+fix(utils): support old TypeScript versions
diff --git a/packages/utils/src/AggregateError.ts b/packages/utils/src/AggregateError.ts
index 36a877ca2ff..7f0c0012cd2 100644
--- a/packages/utils/src/AggregateError.ts
+++ b/packages/utils/src/AggregateError.ts
@@ -1,5 +1,15 @@
-/// <reference lib="es2021.promise" />
-let AggregateErrorImpl = globalThis.AggregateError;
+// Backwards compability for old versions of TypeScript
+interface AggregateError extends Error {
+  errors: any[];
+}
+
+interface AggregateErrorConstructor {
+  new (errors: Iterable<any>, message?: string): AggregateError;
+  (errors: Iterable<any>, message?: string): AggregateError;
+  readonly prototype: AggregateError;
+}
+
+let AggregateErrorImpl: AggregateErrorConstructor = globalThis.AggregateError;
 
 if (typeof AggregateErrorImpl === 'undefined') {
   class AggregateErrorClass extends Error implements AggregateError {