fix: should not be render default indicator when indicator value is null (#19943)

components/spin/__tests__/__snapshots__/index.test.js.snap

@@ -1,5 +1,18 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`Spin if indicator set null should not be render default indicator 1`] = `
+<Spin
+  indicator={null}
+  size="default"
+  spinning={true}
+  wrapperClassName=""
+>
+  <div
+    className="ant-spin ant-spin-spinning"
+  />
+</Spin>
+`;
+
 exports[`Spin should render custom indicator when it's set 1`] = `
 <div
   class="ant-spin ant-spin-spinning"

components/spin/__tests__/index.test.js

@@ -38,4 +38,9 @@ describe('Spin', () => {
     wrapper.setProps({ spinning: true });
     expect(wrapper.instance().state.spinning).toBe(true);
   });
+
+  it('if indicator set null should not be render default indicator', () => {
+    const wrapper = mount(<Spin indicator={null} />);
+    expect(wrapper).toMatchSnapshot();
+  });
 });

components/spin/index.tsx

@@ -7,7 +7,7 @@ import { ConfigConsumer, ConfigConsumerProps } from '../config-provider';
 import { tuple } from '../_util/type';
 
 const SpinSizes = tuple('small', 'default', 'large');
-export type SpinSize = (typeof SpinSizes)[number];
+export type SpinSize = typeof SpinSizes[number];
 export type SpinIndicator = React.ReactElement<HTMLElement>;
 
 export interface SpinProps {
@@ -33,6 +33,12 @@ let defaultIndicator: React.ReactNode = null;
 function renderIndicator(prefixCls: string, props: SpinProps): React.ReactNode {
   const { indicator } = props;
   const dotClassName = `${prefixCls}-dot`;
+
+  // should not be render default indicator when indicator value is null
+  if (indicator === null) {
+    return null;
+  }
+
   if (React.isValidElement(indicator)) {
     return React.cloneElement(indicator, {
       className: classNames(indicator.props.className, dotClassName),