feat: 🎸 初始化项目

src/utils/is.ts

@@ -0,0 +1,43 @@
+export function is(val: unknown, type: string) {
+  return toString.call(val) === `[object ${type}]`
+}
+
+export const isWindow = (val: any): val is Window => {
+  return typeof window !== 'undefined' && is(val, 'Window')
+}
+
+export function isString(val: unknown): val is string {
+  return is(val, 'String')
+}
+
+export const isDef = <T = unknown>(val?: T): val is T => {
+  return typeof val !== 'undefined'
+}
+
+export const isUnDef = <T = unknown>(val?: T): val is T => {
+  return !isDef(val)
+}
+
+export const isFunction = (val: unknown): val is Function => typeof val === 'function'
+
+export const isServer = typeof window === 'undefined'
+
+export function isNumber(val: unknown): val is number {
+  return is(val, 'Number')
+}
+
+export const isFirefox = function() {
+  return !!window.navigator.userAgent.match(/firefox/i)
+}
+
+export const isClient = () => {
+  return typeof window !== 'undefined'
+}
+
+export const isObject = (val: any): val is Record<any, any> => {
+  return val !== null && is(val, 'Object')
+}
+
+export const isElement = (val: unknown): val is Element => {
+  return isObject(val) && !!val.tagName
+}