chore: fix types (#573)

Author: zombieJ

src/Cascader.tsx

@@ -1,5 +1,9 @@
 import type { BuildInPlacements } from '@rc-component/trigger/lib/interface';
-import type { BaseSelectProps, BaseSelectPropsWithoutPrivate, BaseSelectRef } from '@rc-component/select';
+import type {
+  BaseSelectProps,
+  BaseSelectPropsWithoutPrivate,
+  BaseSelectRef,
+} from '@rc-component/select';
 import { BaseSelect } from '@rc-component/select';
 import type { DisplayValueType, Placement } from '@rc-component/select/lib/BaseSelect';
 import useId from '@rc-component/select/lib/hooks/useId';
@@ -143,6 +147,11 @@ export type GetValueType<
   ? ValueType<Required<OptionType>, ValueField>[]
   : ValueType<Required<OptionType>, ValueField>[][];
 
+export type GetOptionType<
+  OptionType extends DefaultOptionType = DefaultOptionType,
+  Multiple extends boolean | React.ReactNode = false,
+> = false extends Multiple ? OptionType[] : OptionType[][];
+
 export interface CascaderProps<
   OptionType extends DefaultOptionType = DefaultOptionType,
   ValueField extends keyof OptionType = keyof OptionType,
@@ -153,7 +162,7 @@ export interface CascaderProps<
   defaultValue?: GetValueType<OptionType, ValueField, Multiple>;
   onChange?: (
     value: GetValueType<OptionType, ValueField, Multiple>,
-    selectOptions: OptionType[],
+    selectOptions: GetOptionType<OptionType, Multiple>,
   ) => void;
 }
 
@@ -368,7 +377,6 @@ const Cascader = React.forwardRef<CascaderRef, InternalCascaderProps>((props, re
   // ============================ Open ============================
   const mergedOpen = open !== undefined ? open : popupVisible;
 
-
   const mergedPlacement = placement || popupPlacement;
 
   const onInternalPopupVisibleChange = (nextVisible: boolean) => {

tests/index.spec.tsx

@@ -864,6 +864,11 @@ describe('Cascader.Basic', () => {
     });
 
     it('multiple', () => {
+      const onTypeChange: (
+        values: string[][],
+        options: { label: React.ReactNode; value: string }[][],
+      ) => void = jest.fn();
+
       const wrapper = mount(
         <Cascader
           options={[
@@ -885,6 +890,7 @@ describe('Cascader.Basic', () => {
           ]}
           value={[['parent'], ['normal', 'child']]}
           checkable
+          onChange={onTypeChange}
         />,
       );