first commit

src/utils/is.js

@@ -0,0 +1,91 @@
+const toString = Object.prototype.toString
+
+export function is(val, type) {
+  return toString.call(val) === `[object ${type}]`
+}
+
+export function isDef(val) {
+  return typeof val !== 'undefined'
+}
+
+export function isUndef(val) {
+  return typeof val === 'undefined'
+}
+
+export function isNull(val) {
+  return val === null
+}
+
+export function isObject(val) {
+  return !isNull(isNull) && is(val, 'Object')
+}
+
+export function isArray(val) {
+  return val && Array.isArray(val)
+}
+
+export function isString(val) {
+  return is(val, 'String')
+}
+
+export function isNumber(val) {
+  return is(val, 'Number')
+}
+
+export function isBoolean(val) {
+  return is(val, 'Boolean')
+}
+
+export function isDate(val) {
+  return is(val, 'Date')
+}
+
+export function isRegExp(val) {
+  return is(val, 'RegExp')
+}
+
+export function isFunction(val) {
+  return typeof val === 'function'
+}
+
+export function isPromise(val) {
+  return is(val, 'Promise') && isObject(val) && isFunction(val.then) && isFunction(val.catch)
+}
+
+export function isElement(val) {
+  return isObject(val) && !!val.tagName
+}
+
+export function isWindow(val) {
+  return typeof window !== 'undefined' && isDef(window) && is(val, 'Window')
+}
+
+export function isNullOrUndef(val) {
+  return isNull(val) || isUndef(val)
+}
+
+export function isEmpty(val) {
+  if (isArray(val) || isString(val)) {
+    return val.length === 0
+  }
+
+  if (val instanceof Map || val instanceof Set) {
+    return val.size === 0
+  }
+
+  if (isObject(val)) {
+    return Object.keys(val).length === 0
+  }
+
+  return false
+}
+
+export function isUrl(path) {
+  const reg =
+    /(((^https?:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+(?::\d+)?|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?)$/
+  return reg.test(path)
+}
+
+export const isServer = typeof window === 'undefined'
+
+export const isClient = !isServer