fix(utils): support old TypeScript versions

ardatan · Aug 4, 2021 · 0483004 · 0483004 · vercel · Aug 4, 2021
1 parent bd31967
commit 0483004
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diff --git a/.changeset/old-forks-think.md 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
@@ -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 {