From c85f501f7e19c5313f388f8a2bcaf36cf491fea2 Mon Sep 17 00:00:00 2001
From: shanejonas <jonas.shane@gmail.com>
Date: Thu, 17 Dec 2020 09:05:23 -0800
Subject: [PATCH] fix: jsonrpc error instanceof

fixes #209
---
 src/Error.test.ts | 5 +++++
 src/Error.ts      | 1 +
 2 files changed, 6 insertions(+)

diff --git a/src/Error.test.ts b/src/Error.test.ts
index 3531caf..d5e9ae8 100644
--- a/src/Error.test.ts
+++ b/src/Error.test.ts
@@ -16,4 +16,9 @@ describe("Error test", () => {
     const err2 = new JSONRPCError("test", 9999, "testdata");
   });
 
+  it("should be able to use instanceof", () => {
+    const err = new JSONRPCError("test", 9999);
+    expect(err instanceof JSONRPCError).toBe(true);
+  });
+
 });
diff --git a/src/Error.ts b/src/Error.ts
index 2bf30ce..d8d3ae2 100644
--- a/src/Error.ts
+++ b/src/Error.ts
@@ -11,6 +11,7 @@ export class JSONRPCError extends Error {
     this.message = message;
     this.code = code;
     this.data = data;
+    Object.setPrototypeOf(this, new.target.prototype); // restore prototype chain: see https://github.com/open-rpc/client-js/issues/209
   }
 }