From 97629320b79f150a0d98b546a7450ef693aa597b Mon Sep 17 00:00:00 2001
From: xile611 <dingling112@gmail.com>
Date: Tue, 29 Aug 2023 16:16:26 +0800
Subject: [PATCH] fix(vscale): identity-scale `rang()` return the same value as
 `domain()`

---
 packages/vscale/__tests__/identity-scale.test.ts | 2 ++
 packages/vscale/src/identity-scale.ts            | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/vscale/__tests__/identity-scale.test.ts b/packages/vscale/__tests__/identity-scale.test.ts
index 66d3c55..94f005d 100644
--- a/packages/vscale/__tests__/identity-scale.test.ts
+++ b/packages/vscale/__tests__/identity-scale.test.ts
@@ -3,6 +3,8 @@ import { IdentityScale } from '../src/identity-scale';
 test('IdentityScale of any values', () => {
   const scale = new IdentityScale();
 
+  expect(scale.domain()).toBeUndefined();
+  expect(scale.range()).toBeUndefined();
   expect(scale.scale('x')).toBe('x');
   expect(scale.scale(12)).toBe(12);
 });
diff --git a/packages/vscale/src/identity-scale.ts b/packages/vscale/src/identity-scale.ts
index 9316cb2..d205889 100644
--- a/packages/vscale/src/identity-scale.ts
+++ b/packages/vscale/src/identity-scale.ts
@@ -65,7 +65,7 @@ export class IdentityScale implements IBaseScale {
   range(_: any[]): this;
   range(_?: any[]): this | any {
     if (!_) {
-      return undefined;
+      return this._domain ? this._domain.slice() : undefined;
     }
 
     return this;