fix(2377): registerTheme 时，需要和基础主题进行合并

src/theme/index.ts

@@ -1,4 +1,4 @@
-import { get, lowerCase } from '@antv/util';
+import { deepMix, get, lowerCase } from '@antv/util';
 import { LooseObject, StyleSheet } from '../interface';
 
 import { createThemeByStylesheet } from '../util/theme';
@@ -25,5 +25,5 @@ export function getTheme(theme?: string): LooseObject {
  * @param value 具体的主题配置。
  */
 export function registerTheme(theme: string, value: LooseObject) {
-  Themes[lowerCase(theme)] = value;
+  Themes[lowerCase(theme)] = deepMix({}, Themes.default, value);
 }

tests/bugs/2377-spec.ts

@@ -0,0 +1,16 @@
+import { registerTheme, getTheme } from '../../src';
+import { createDiv } from '../util/dom';
+import { deepMix } from '@antv/util';
+
+describe('2377', () => {
+  it('2377', () => {
+    // Step 1: 注册主题
+    registerTheme('newTheme', {
+      defaultColor: 'red',
+    });
+
+    expect(getTheme('newTheme')).toEqual(deepMix({}, getTheme('default'), {
+      defaultColor: 'red',
+    }));
+  });
+});

tests/unit/theme/index-spec.ts

@@ -1,7 +1,9 @@
 import { getTheme, registerTheme } from '../../../src';
+import { deepMix } from '@antv/util';
 
 describe('theme', () => {
   test('theme API', () => {
+    const defaultTheme = getTheme('default');
     expect(getTheme()).toEqual(getTheme('default'));
 
     // 都是 default
@@ -10,7 +12,7 @@ describe('theme', () => {
     registerTheme('default', {});
     registerTheme('a', { a: 1 });
 
-    expect(getTheme('a')).toEqual({ a: 1 });
-    expect(getTheme('default')).toEqual({});
+    expect(getTheme('a')).toEqual(deepMix({}, defaultTheme, { a: 1 }));
+    expect(getTheme('default')).toEqual(defaultTheme);
   });
 });