chore: make util function shorter, reduce file count for vite (#9595)

* chore: make util function shorter, reduce file count for vite

* fix: test case

packages/vant/docs/site/use-translate.ts

@@ -1,7 +1,6 @@
 import Locale from '../../src/locale';
 import enUS from '../../src/locale/lang/en-US';
-import { camelize } from '../../src/utils/format/string';
+import { camelize, createTranslate } from '../../src/utils';
-import { createTranslate } from '../../src/utils/create/translate';
 import type { App } from 'vue';
 import type { Router } from 'vue-router';
 

packages/vant/src/address-edit/AddressEdit.tsx

@@ -50,9 +50,7 @@ const DEFAULT_DATA: AddressEditInfo = {
   addressDetail: '',
 };
 
-function isPostal(value: string) {
+const isPostal = (value: string) => /^\d{6}$/.test(value);
-  return /^\d{6}$/.test(value);
-}
 
 const props = {
   areaList: Object as PropType<AreaList>,

packages/vant/src/area/Area.tsx

@@ -46,9 +46,7 @@ const INHERIT_PROPS = [
   'confirmButtonText',
 ] as const;
 
-function isOverseaCode(code: string) {
+const isOverseaCode = (code: string) => code[0] === '9';
-  return code[0] === '9';
-}
 
 const props = extend({}, pickerProps, {
   value: String,

packages/vant/src/calendar/utils.ts

@@ -4,9 +4,8 @@ const [name, bem, t] = createNamespace('calendar');
 
 export { name, bem, t };
 
-export function formatMonthTitle(date: Date) {
+export const formatMonthTitle = (date: Date) =>
-  return t('monthTitle', date.getFullYear(), date.getMonth() + 1);
+  t('monthTitle', date.getFullYear(), date.getMonth() + 1);
-}
 
 export function compareMonth(date1: Date, date2: Date) {
   const year1 = date1.getFullYear();

packages/vant/src/circle/Circle.tsx

@@ -6,9 +6,7 @@ const [name, bem] = createNamespace('circle');
 
 let uid = 0;
 
-function format(rate: string | number) {
+const format = (rate: string | number) => Math.min(Math.max(+rate, 0), 100);
-  return Math.min(Math.max(+rate, 0), 100);
-}
 
 function getPath(clockwise: boolean, viewBoxSize: number) {
   const sweepFlag = clockwise ? 1 : 0;

packages/vant/src/composables/use-placeholder.tsx

@@ -1,6 +1,6 @@
 import { Ref } from 'vue';
 import { useHeight } from './use-height';
-import type { BEM } from '../utils/create/bem';
+import type { BEM } from '../utils/create';
 
 export function usePlaceholder(contentRef: Ref<Element | undefined>, bem: BEM) {
   const height = useHeight(contentRef);

packages/vant/src/coupon/Coupon.tsx

@@ -27,15 +27,11 @@ function getDate(timeStamp: number) {
   )}`;
 }
 
-function formatDiscount(discount: number) {
+const formatDiscount = (discount: number) =>
-  return (discount / 10).toFixed(discount % 10 === 0 ? 0 : 1);
+  (discount / 10).toFixed(discount % 10 === 0 ? 0 : 1);
-}
 
-function formatAmount(amount: number) {
+const formatAmount = (amount: number) =>
-  return (amount / 100).toFixed(
+  (amount / 100).toFixed(amount % 100 === 0 ? 0 : amount % 10 === 0 ? 1 : 2);
-    amount % 100 === 0 ? 0 : amount % 10 === 0 ? 1 : 2
-  );
-}
 
 export default defineComponent({
   name,

packages/vant/src/datetime-picker/utils.ts

@@ -43,6 +43,5 @@ export function getTrueValue(value: string | undefined): number {
   return parseInt(value, 10);
 }
 
-export function getMonthEndDay(year: number, month: number): number {
+export const getMonthEndDay = (year: number, month: number): number =>
-  return 32 - new Date(year, month - 1, 32).getDate();
+  32 - new Date(year, month - 1, 32).getDate();
-}

packages/vant/src/icon/Icon.tsx

@@ -5,9 +5,7 @@ import { CONFIG_PROVIDER_KEY } from '../config-provider/ConfigProvider';
 
 const [name, bem] = createNamespace('icon');
 
-function isImage(name?: string) {
+const isImage = (name?: string) => name?.includes('/');
-  return name?.includes('/');
-}
 
 export default defineComponent({
   name,

packages/vant/src/image-preview/ImagePreviewItem.tsx

@@ -11,12 +11,11 @@ import { Image } from '../image';
 import { Loading } from '../loading';
 import { SwipeItem } from '../swipe-item';
 
-function getDistance(touches: TouchList) {
+const getDistance = (touches: TouchList) =>
-  return Math.sqrt(
+  Math.sqrt(
     (touches[0].clientX - touches[1].clientX) ** 2 +
       (touches[0].clientY - touches[1].clientY) ** 2
   );
-}
 
 const bem = createNamespace('image-preview')[1];
 

packages/vant/src/index-anchor/IndexAnchor.tsx

@@ -8,7 +8,7 @@ import {
   createNamespace,
 } from '../utils';
 import { INDEX_BAR_KEY } from '../index-bar/IndexBar';
-import { getScrollTop, getRootScrollTop } from '../utils/dom/scroll';
+import { getScrollTop, getRootScrollTop } from '../utils/dom';
 
 // Composables
 import { useRect, useParent } from '@vant/use';

packages/vant/src/notify/function-call.tsx

@@ -13,9 +13,8 @@ import type { NotifyMessage, NotifyOptions } from './types';
 let timer: number;
 let instance: ComponentInstance;
 
-function parseOptions(message: NotifyMessage | NotifyOptions) {
+const parseOptions = (message: NotifyMessage | NotifyOptions) =>
-  return isObject(message) ? message : { message };
+  isObject(message) ? message : { message };
-}
 
 function initInstance() {
   ({ instance } = mountComponent({
@@ -47,20 +46,18 @@ function Notify(options: NotifyMessage | NotifyOptions) {
   return instance;
 }
 
-function defaultOptions() {
+const getDefaultOptions = (): NotifyOptions => ({
-  return {
+  type: 'danger',
-    type: 'danger',
+  color: undefined,
-    color: undefined,
+  message: '',
-    message: '',
+  onClose: undefined,
-    onClose: undefined,
+  onClick: undefined,
-    onClick: undefined,
+  onOpened: undefined,
-    onOpened: undefined,
+  duration: 3000,
-    duration: 3000,
+  className: '',
-    className: '',
+  lockScroll: false,
-    lockScroll: false,
+  background: undefined,
-    background: undefined,
+});
-  } as NotifyOptions;
-}
 
 Notify.clear = () => {
   if (instance) {
@@ -68,14 +65,14 @@ Notify.clear = () => {
   }
 };
 
-Notify.currentOptions = defaultOptions();
+Notify.currentOptions = getDefaultOptions();
 
 Notify.setDefaultOptions = (options: NotifyOptions) => {
   extend(Notify.currentOptions, options);
 };
 
 Notify.resetDefaultOptions = () => {
-  Notify.currentOptions = defaultOptions();
+  Notify.currentOptions = getDefaultOptions();
 };
 
 Notify.Component = withInstall(VanNotify);

packages/vant/src/pagination/Pagination.tsx

@@ -9,13 +9,11 @@ type PageItem = {
   active?: boolean;
 };
 
-function makePage(
+const makePage = (
   number: number,
   text: string | number,
   active?: boolean
-): PageItem {
+): PageItem => ({ number, text, active });
-  return { number, text, active };
-}
 
 export type PaginationMode = 'simple' | 'multi';
 

packages/vant/src/picker/PickerColumn.tsx

@@ -36,9 +36,8 @@ function getElementTranslateY(element: Element) {
 
 export const PICKER_KEY = Symbol(name);
 
-function isOptionDisabled(option: PickerOption) {
+const isOptionDisabled = (option: PickerOption) =>
-  return isObject(option) && option.disabled;
+  isObject(option) && option.disabled;
-}
 
 export default defineComponent({
   name,

packages/vant/src/stepper/Stepper.tsx

@@ -23,9 +23,8 @@ const [name, bem] = createNamespace('stepper');
 const LONG_PRESS_INTERVAL = 200;
 const LONG_PRESS_START_TIME = 600;
 
-function equal(value1?: string | number, value2?: string | number) {
+const isEqual = (value1?: string | number, value2?: string | number) =>
-  return String(value1) === String(value2);
+  String(value1) === String(value2);
-}
 
 export type StepperTheme = 'default' | 'round';
 
@@ -107,7 +106,7 @@ export default defineComponent({
       const defaultValue = props.modelValue ?? props.defaultValue;
       const value = format(defaultValue);
 
-      if (!equal(value, props.modelValue)) {
+      if (!isEqual(value, props.modelValue)) {
         emit('update:modelValue', value);
       }
 
@@ -135,7 +134,7 @@ export default defineComponent({
 
     const check = () => {
       const value = format(current.value);
-      if (!equal(value, current.value)) {
+      if (!isEqual(value, current.value)) {
         current.value = value;
       }
     };
@@ -185,7 +184,7 @@ export default defineComponent({
 
       if (props.beforeChange) {
         input.value = String(current.value);
-      } else if (!equal(value, formatted)) {
+      } else if (!isEqual(value, formatted)) {
         input.value = formatted;
       }
 
@@ -281,7 +280,7 @@ export default defineComponent({
     watch(
       () => props.modelValue,
       (value) => {
-        if (!equal(value, current.value)) {
+        if (!isEqual(value, current.value)) {
           current.value = format(value!);
         }
       }

packages/vant/src/uploader/utils.ts

@@ -9,13 +9,8 @@ const [name, bem] = createNamespace('uploader');
 
 export { name, bem };
 
-export function toArray<T>(item: T | T[]): T[] {
+export const toArray = <T>(item: T | T[]): T[] =>
-  if (Array.isArray(item)) {
+  Array.isArray(item) ? item : [item];
-    return item;
-  }
-
-  return [item];
-}
 
 export function readFileContent(file: File, resultType: UploaderResultType) {
   return new Promise<string | void>((resolve) => {
@@ -73,9 +68,7 @@ export function filterFiles(
 
 const IMAGE_REGEXP = /\.(jpeg|jpg|gif|png|svg|webp|jfif|bmp|dpg)/i;
 
-export function isImageUrl(url: string): boolean {
+export const isImageUrl = (url: string): boolean => IMAGE_REGEXP.test(url);
-  return IMAGE_REGEXP.test(url);
-}
 
 export function isImageFile(item: UploaderFileListItem): boolean {
   // some special urls cannot be recognized

packages/vant/src/utils/create.ts

@@ -0,0 +1,71 @@
+import { get } from './basic';
+import { camelize } from './format';
+import { isFunction } from './validate';
+import locale from '../locale';
+
+export function createTranslate(name: string) {
+  const prefix = camelize(name) + '.';
+
+  return (path: string, ...args: any[]): any => {
+    const messages = locale.messages();
+    const message = get(messages, prefix + path) || get(messages, path);
+
+    return isFunction(message) ? message(...args) : message;
+  };
+}
+
+export type Translate = ReturnType<typeof createTranslate>;
+
+export type Mod = string | { [key: string]: any };
+export type Mods = Mod | Mod[];
+
+function genBem(name: string, mods?: Mods): string {
+  if (!mods) {
+    return '';
+  }
+
+  if (typeof mods === 'string') {
+    return ` ${name}--${mods}`;
+  }
+
+  if (Array.isArray(mods)) {
+    return mods.reduce<string>((ret, item) => ret + genBem(name, item), '');
+  }
+
+  return Object.keys(mods).reduce(
+    (ret, key) => ret + (mods[key] ? genBem(name, key) : ''),
+    ''
+  );
+}
+
+/**
+ * bem helper
+ * b() // 'button'
+ * b('text') // 'button__text'
+ * b({ disabled }) // 'button button--disabled'
+ * b('text', { disabled }) // 'button__text button__text--disabled'
+ * b(['disabled', 'primary']) // 'button button--disabled button--primary'
+ */
+export function createBEM(name: string) {
+  return (el?: Mods, mods?: Mods): Mods => {
+    if (el && typeof el !== 'string') {
+      mods = el;
+      el = '';
+    }
+
+    el = el ? `${name}__${el}` : name;
+
+    return `${el}${genBem(el, mods)}`;
+  };
+}
+
+export type BEM = ReturnType<typeof createBEM>;
+
+export function createNamespace(name: string) {
+  const prefixedName = `van-${name}`;
+  return [
+    prefixedName,
+    createBEM(prefixedName),
+    createTranslate(prefixedName),
+  ] as const;
+}

packages/vant/src/utils/create/bem.ts

@@ -1,45 +0,0 @@
-/**
- * bem helper
- * b() // 'button'
- * b('text') // 'button__text'
- * b({ disabled }) // 'button button--disabled'
- * b('text', { disabled }) // 'button__text button__text--disabled'
- * b(['disabled', 'primary']) // 'button button--disabled button--primary'
- */
-
-export type Mod = string | { [key: string]: any };
-export type Mods = Mod | Mod[];
-
-function gen(name: string, mods?: Mods): string {
-  if (!mods) {
-    return '';
-  }
-
-  if (typeof mods === 'string') {
-    return ` ${name}--${mods}`;
-  }
-
-  if (Array.isArray(mods)) {
-    return mods.reduce<string>((ret, item) => ret + gen(name, item), '');
-  }
-
-  return Object.keys(mods).reduce(
-    (ret, key) => ret + (mods[key] ? gen(name, key) : ''),
-    ''
-  );
-}
-
-export function createBEM(name: string) {
-  return function (el?: Mods, mods?: Mods): Mods {
-    if (el && typeof el !== 'string') {
-      mods = el;
-      el = '';
-    }
-
-    el = el ? `${name}__${el}` : name;
-
-    return `${el}${gen(el, mods)}`;
-  };
-}
-
-export type BEM = ReturnType<typeof createBEM>;

packages/vant/src/utils/create/index.ts

@@ -1,11 +0,0 @@
-import { createBEM } from './bem';
-import { createTranslate } from './translate';
-
-export function createNamespace(name: string) {
-  const prefixedName = `van-${name}`;
-  return [
-    prefixedName,
-    createBEM(prefixedName),
-    createTranslate(prefixedName),
-  ] as const;
-}

packages/vant/src/utils/create/translate.ts

@@ -1,17 +0,0 @@
-import { get } from '../base';
-import { camelize } from '../format/string';
-import { isFunction } from '../validate';
-import locale from '../../locale';
-
-export function createTranslate(name: string) {
-  const prefix = camelize(name) + '.';
-
-  return function (path: string, ...args: any[]): any {
-    const messages = locale.messages();
-    const message = get(messages, prefix + path) || get(messages, path);
-
-    return isFunction(message) ? message(...args) : message;
-  };
-}
-
-export type Translate = ReturnType<typeof createTranslate>;

packages/vant/src/utils/dom.ts

@@ -1,10 +1,9 @@
-import { isIOS as checkIsIOS } from '../validate';
+import { unref, Ref } from 'vue';
+import { isIOS as checkIsIOS } from './validate';
 
 export type ScrollElement = Element | Window;
 
-function isWindow(val: unknown): val is Window {
+const isWindow = (val: unknown): val is Window => val === window;
-  return val === window;
-}
 
 export function getScrollTop(el: ScrollElement): number {
   const top = 'scrollTop' in el ? el.scrollTop : el.pageYOffset;
@@ -68,3 +67,41 @@ export function resetScroll() {
     setRootScrollTop(getRootScrollTop());
   }
 }
+
+export const stopPropagation = (event: Event) => event.stopPropagation();
+
+export function preventDefault(event: Event, isStopPropagation?: boolean) {
+  /* istanbul ignore else */
+  if (typeof event.cancelable !== 'boolean' || event.cancelable) {
+    event.preventDefault();
+  }
+
+  if (isStopPropagation) {
+    stopPropagation(event);
+  }
+}
+
+export function trigger(target: Element, type: string) {
+  const inputEvent = document.createEvent('HTMLEvents');
+  inputEvent.initEvent(type, true, true);
+  target.dispatchEvent(inputEvent);
+}
+
+export function isHidden(
+  elementRef: HTMLElement | Ref<HTMLElement | undefined>
+) {
+  const el = unref(elementRef);
+  if (!el) {
+    return false;
+  }
+
+  const style = window.getComputedStyle(el);
+  const hidden = style.display === 'none';
+
+  // offsetParent returns null in the following situations:
+  // 1. The element or its parent element has the display property set to none.
+  // 2. The element has the position property set to fixed
+  const parentHidden = el.offsetParent === null && style.position !== 'fixed';
+
+  return hidden || parentHidden;
+}

packages/vant/src/utils/dom/event.ts

@@ -1,20 +0,0 @@
-export function stopPropagation(event: Event) {
-  event.stopPropagation();
-}
-
-export function preventDefault(event: Event, isStopPropagation?: boolean) {
-  /* istanbul ignore else */
-  if (typeof event.cancelable !== 'boolean' || event.cancelable) {
-    event.preventDefault();
-  }
-
-  if (isStopPropagation) {
-    stopPropagation(event);
-  }
-}
-
-export function trigger(target: Element, type: string) {
-  const inputEvent = document.createEvent('HTMLEvents');
-  inputEvent.initEvent(type, true, true);
-  target.dispatchEvent(inputEvent);
-}

packages/vant/src/utils/dom/style.ts

@@ -1,20 +0,0 @@
-import { unref, Ref } from 'vue';
-
-export function isHidden(
-  elementRef: HTMLElement | Ref<HTMLElement | undefined>
-) {
-  const el = unref(elementRef);
-  if (!el) {
-    return false;
-  }
-
-  const style = window.getComputedStyle(el);
-  const hidden = style.display === 'none';
-
-  // offsetParent returns null in the following situations:
-  // 1. The element or its parent element has the display property set to none.
-  // 2. The element has the position property set to fixed
-  const parentHidden = el.offsetParent === null && style.position !== 'fixed';
-
-  return hidden || parentHidden;
-}

packages/vant/src/utils/format.ts

@@ -1,6 +1,6 @@
 import { CSSProperties } from 'vue';
-import { inBrowser } from '../base';
+import { inBrowser } from './basic';
-import { isDef, isNumeric } from '../validate';
+import { isDef, isNumeric } from './validate';
 
 export function addUnit(value?: string | number): string | undefined {
   if (!isDef(value)) {
@@ -79,3 +79,70 @@ export function unitToPx(value: string | number): number {
 
   return parseFloat(value);
 }
+
+const camelizeRE = /-(\w)/g;
+
+export const camelize = (str: string): string =>
+  str.replace(camelizeRE, (_, c) => c.toUpperCase());
+
+export const kebabCase = (str: string) =>
+  str
+    .replace(/([A-Z])/g, '-$1')
+    .toLowerCase()
+    .replace(/^-/, '');
+
+export function padZero(num: number | string, targetLength = 2): string {
+  let str = num + '';
+
+  while (str.length < targetLength) {
+    str = '0' + str;
+  }
+
+  return str;
+}
+
+/** clamps number within the inclusive lower and upper bounds */
+export const clamp = (num: number, min: number, max: number): number =>
+  Math.min(Math.max(num, min), max);
+
+function trimExtraChar(value: string, char: string, regExp: RegExp) {
+  const index = value.indexOf(char);
+
+  if (index === -1) {
+    return value;
+  }
+
+  if (char === '-' && index !== 0) {
+    return value.slice(0, index);
+  }
+
+  return value.slice(0, index + 1) + value.slice(index).replace(regExp, '');
+}
+
+export function formatNumber(
+  value: string,
+  allowDot = true,
+  allowMinus = true
+) {
+  if (allowDot) {
+    value = trimExtraChar(value, '.', /\./g);
+  } else {
+    value = value.split('.')[0];
+  }
+
+  if (allowMinus) {
+    value = trimExtraChar(value, '-', /-/g);
+  } else {
+    value = value.replace(/-/, '');
+  }
+
+  const regExp = allowDot ? /[^-0-9.]/g : /[^-0-9]/g;
+
+  return value.replace(regExp, '');
+}
+
+// add num and avoid float number
+export function addNumber(num1: number, num2: number) {
+  const cardinal = 10 ** 10;
+  return Math.round((num1 + num2) * cardinal) / cardinal;
+}

packages/vant/src/utils/format/number.ts

@@ -1,46 +0,0 @@
-/** clamps number within the inclusive lower and upper bounds */
-export function clamp(num: number, min: number, max: number): number {
-  return Math.min(Math.max(num, min), max);
-}
-
-function trimExtraChar(value: string, char: string, regExp: RegExp) {
-  const index = value.indexOf(char);
-
-  if (index === -1) {
-    return value;
-  }
-
-  if (char === '-' && index !== 0) {
-    return value.slice(0, index);
-  }
-
-  return value.slice(0, index + 1) + value.slice(index).replace(regExp, '');
-}
-
-export function formatNumber(
-  value: string,
-  allowDot = true,
-  allowMinus = true
-) {
-  if (allowDot) {
-    value = trimExtraChar(value, '.', /\./g);
-  } else {
-    value = value.split('.')[0];
-  }
-
-  if (allowMinus) {
-    value = trimExtraChar(value, '-', /-/g);
-  } else {
-    value = value.replace(/-/, '');
-  }
-
-  const regExp = allowDot ? /[^-0-9.]/g : /[^-0-9]/g;
-
-  return value.replace(regExp, '');
-}
-
-// add num and avoid float number
-export function addNumber(num1: number, num2: number) {
-  const cardinal = 10 ** 10;
-  return Math.round((num1 + num2) * cardinal) / cardinal;
-}

packages/vant/src/utils/format/string.ts

@@ -1,22 +0,0 @@
-const camelizeRE = /-(\w)/g;
-
-export function camelize(str: string): string {
-  return str.replace(camelizeRE, (_, c) => c.toUpperCase());
-}
-
-export function kebabCase(str: string) {
-  return str
-    .replace(/([A-Z])/g, '-$1')
-    .toLowerCase()
-    .replace(/^-/, '');
-}
-
-export function padZero(num: number | string, targetLength = 2): string {
-  let str = num + '';
-
-  while (str.length < targetLength) {
-    str = '0' + str;
-  }
-
-  return str;
-}

packages/vant/src/utils/index.ts

@@ -1,12 +1,8 @@
-export * from './base';
+export * from './basic';
+export * from './dom';
 export * from './create';
+export * from './format';
 export * from './constant';
 export * from './validate';
-export * from './dom/style';
-export * from './dom/event';
-export * from './dom/scroll';
 export * from './interceptor';
 export * from './with-install';
-export * from './format/unit';
-export * from './format/number';
-export * from './format/string';

packages/vant/src/utils/test/bem.spec.ts

@@ -1,4 +1,4 @@
-import { createBEM } from '../create/bem';
+import { createBEM } from '../create';
 
 test('bem', () => {
   const bem = createBEM('button');

packages/vant/src/utils/test/index.spec.ts

@@ -1,10 +1,8 @@
+import { get, noop } from '../basic';
 import { deepClone } from '../deep-clone';
 import { deepAssign } from '../deep-assign';
-import { get, noop } from '..';
 import { isDef, isMobile, isNumeric } from '../validate';
-import { camelize } from '../format/string';
+import { addUnit, unitToPx, camelize, formatNumber } from '../format';
-import { formatNumber } from '../format/number';
-import { addUnit, unitToPx } from '../format/unit';
 
 test('deepClone', () => {
   const a = { foo: 0 };

packages/vant/src/utils/validate.ts

@@ -1,28 +1,21 @@
-import { inBrowser } from './base';
+import { inBrowser } from './basic';
 
-export function isDef<T>(val: T): val is NonNullable<T> {
+export const isDef = <T>(val: T): val is NonNullable<T> =>
-  return val !== undefined && val !== null;
+  val !== undefined && val !== null;
-}
 
 // eslint-disable-next-line @typescript-eslint/ban-types
-export function isFunction(val: unknown): val is Function {
+export const isFunction = (val: unknown): val is Function =>
-  return typeof val === 'function';
+  typeof val === 'function';
-}
 
-export function isObject(val: unknown): val is Record<any, any> {
+export const isObject = (val: unknown): val is Record<any, any> =>
-  return val !== null && typeof val === 'object';
+  val !== null && typeof val === 'object';
-}
 
-export function isPromise<T = any>(val: unknown): val is Promise<T> {
+export const isPromise = <T = any>(val: unknown): val is Promise<T> =>
-  return isObject(val) && isFunction(val.then) && isFunction(val.catch);
+  isObject(val) && isFunction(val.then) && isFunction(val.catch);
-}
 
-export function isDate(val: unknown): val is Date {
+export const isDate = (val: unknown): val is Date =>
-  return (
+  Object.prototype.toString.call(val) === '[object Date]' &&
-    Object.prototype.toString.call(val) === '[object Date]' &&
+  !Number.isNaN((val as Date).getTime());
-    !Number.isNaN((val as Date).getTime())
-  );
-}
 
 export function isMobile(value: string): boolean {
   value = value.replace(/[^-|\d]/g, '');
@@ -31,12 +24,10 @@ export function isMobile(value: string): boolean {
   );
 }
 
-export function isNumeric(val: string | number): val is string {
+export const isNumeric = (val: string | number): val is string =>
-  return typeof val === 'number' || /^\d+(\.\d+)?$/.test(val);
+  typeof val === 'number' || /^\d+(\.\d+)?$/.test(val);
-}
 
-export function isIOS(): boolean {
+export const isIOS = (): boolean =>
-  return inBrowser
+  inBrowser
     ? /ios|iphone|ipad|ipod/.test(navigator.userAgent.toLowerCase())
     : false;
-}

packages/vant/src/utils/with-install.ts

@@ -1,5 +1,5 @@
 import { App } from 'vue';
-import { camelize } from './format/string';
+import { camelize } from './format';
 
 // https://github.com/youzan/vant/issues/8302
 type EventShim = {