initial commit

src/utils/is.ts

@@ -0,0 +1,69 @@
+const toString = Object.prototype.toString;
+
+export function is(val: unknown, type: string) {
+  return toString.call(val) === `[object ${type}]`;
+}
+
+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 isObject = (val: any): val is Record<any, any> => {
+  return val !== null && is(val, 'Object');
+};
+
+export function isDate(val: unknown): val is Date {
+  return is(val, 'Date');
+}
+
+export function isNull(val: unknown): val is null {
+  return val === null;
+}
+
+export function isNumber(val: unknown): val is number {
+  return is(val, 'Number');
+}
+
+export function isPromise<T = any>(val: unknown): val is Promise<T> {
+  return is(val, 'Promise') && isObject(val) && isFunction(val.then) && isFunction(val.catch);
+}
+
+export function isString(val: unknown): val is string {
+  return is(val, 'String');
+}
+
+export const isFunction = (val: unknown): val is Function => typeof val === 'function';
+
+export function isBoolean(val: unknown): val is boolean {
+  return is(val, 'Boolean');
+}
+
+export function isRegExp(val: unknown): val is RegExp {
+  return is(val, 'RegExp');
+}
+
+export function isArray(val: unknown): val is Array<any> {
+  return val && Array.isArray(val);
+}
+
+export const isClient = () => {
+  return typeof window !== 'undefined';
+};
+
+export const isWindow = (val: any): val is Window => {
+  return typeof window !== 'undefined' && is(val, 'Window');
+};
+
+export const isElement = (val: unknown): val is Element => {
+  return isObject(val) && !!val.tagName;
+};
+
+export const isServer = typeof window === 'undefined';
+
+export function isImageDom(o: Element) {
+  return o && ['IMAGE', 'IMG'].includes(o.tagName);
+}