chore: add Numeric type

packages/vant/src/index-bar/IndexBar.tsx

@@ -25,6 +25,7 @@ import {
   createNamespace,
   getRootScrollTop,
   setRootScrollTop,
+  type Numeric,
 } from '../utils';
 
 // Composables
@@ -58,7 +59,7 @@ const indexBarProps = {
   highlightColor: String,
   stickyOffsetTop: makeNumberProp(0),
   indexList: {
-    type: Array as PropType<Array<string | number>>,
+    type: Array as PropType<Numeric[]>,
     default: genAlphabet,
   },
 };
@@ -76,7 +77,7 @@ export default defineComponent({
 
   setup(props, { emit, slots }) {
     const root = ref<HTMLElement>();
-    const activeAnchor = ref<string | number>('');
+    const activeAnchor = ref<Numeric>('');
 
     const touch = useTouch();
     const scrollParent = useScrollParent(root);
@@ -207,7 +208,7 @@ export default defineComponent({
         );
       });
 
-    const scrollTo = (index: string | number) => {
+    const scrollTo = (index: Numeric) => {
       selectActiveIndex = String(index);
       const match = getMatchAnchor(selectActiveIndex);