fix: ConfigProvider with nest prefixCls (#23423)

* fix: ConfigProvider with nest prefixCls

* update

* update

* update

components/config-provider/__tests__/index.test.js

@@ -42,4 +42,16 @@ describe('ConfigProvider', () => {
 
     expect(wrapper.text()).toContain('empty placeholder');
   });
+
+  it('nest prefixCls', () => {
+    const wrapper = mount(
+      <ConfigProvider prefixCls="bamboo">
+        <ConfigProvider>
+          <Button />
+        </ConfigProvider>
+      </ConfigProvider>,
+    );
+
+    expect(wrapper.find('button').props().className).toEqual('bamboo-btn');
+  });
 });

components/config-provider/context.tsx

@@ -29,7 +29,7 @@ export const ConfigContext = React.createContext<ConfigConsumerProps>({
   getPrefixCls: (suffixCls: string, customizePrefixCls?: string) => {
     if (customizePrefixCls) return customizePrefixCls;
 
-    return `ant-${suffixCls}`;
+    return suffixCls ? `ant-${suffixCls}` : 'ant';
   },
 
   renderEmpty: defaultRenderEmpty,

components/config-provider/index.tsx

@@ -45,12 +45,16 @@ export interface ConfigProviderProps {
 }
 
 class ConfigProvider extends React.Component<ConfigProviderProps> {
-  getPrefixCls = (suffixCls: string, customizePrefixCls?: string) => {
-    const { prefixCls = 'ant' } = this.props;
+  getPrefixClsWrapper = (context: ConfigConsumerProps) => {
+    return (suffixCls: string, customizePrefixCls?: string) => {
+      const { prefixCls } = this.props;
 
-    if (customizePrefixCls) return customizePrefixCls;
+      if (customizePrefixCls) return customizePrefixCls;
 
-    return suffixCls ? `${prefixCls}-${suffixCls}` : prefixCls;
+      const mergedPrefixCls = prefixCls || context.getPrefixCls('');
+
+      return suffixCls ? `${mergedPrefixCls}-${suffixCls}` : mergedPrefixCls;
+    };
   };
 
   renderProvider = (context: ConfigConsumerProps, legacyLocale: Locale) => {
@@ -70,7 +74,7 @@ class ConfigProvider extends React.Component<ConfigProviderProps> {
 
     const config: ConfigConsumerProps = {
       ...context,
-      getPrefixCls: this.getPrefixCls,
+      getPrefixCls: this.getPrefixClsWrapper(context),
       csp,
       autoInsertSpaceInButton,
       locale: locale || legacyLocale,