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111 lines
2.9 KiB
TypeScript
111 lines
2.9 KiB
TypeScript
/**
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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const toString = Object.prototype.toString;
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export function is(val: unknown, type: string): boolean {
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return toString.call(val) === `[object ${type}]`;
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}
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export function isDef<T = unknown>(val?: T): val is T {
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return typeof val !== "undefined";
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}
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export function isUnDef<T = unknown>(val?: T): val is T {
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return !isDef(val);
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}
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export function isObject(val: unknown): val is Record<any, any> {
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return val !== null && is(val, "Object");
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}
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export function isEmpty<T = unknown>(val: any): val is T {
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if (isArray(val) || isString(val)) {
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return val.length === 0;
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}
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if (val instanceof Map || val instanceof Set) {
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return val.size === 0;
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}
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if (isObject(val)) {
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return Object.keys(val).length === 0;
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}
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return false;
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}
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export function isDate(val: unknown): val is Date {
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return is(val, "Date");
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}
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export function isNull(val: unknown): val is null {
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return val === null;
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}
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export function isNullAndUnDef(val: unknown): val is null | undefined {
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return isUnDef(val) && isNull(val);
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}
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export function isNullOrUnDef(val: unknown): val is null | undefined {
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return isUnDef(val) || isNull(val);
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}
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export function isNumber(val: unknown): val is number {
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return is(val, "Number");
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}
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export function isPromise<T = any>(val: unknown): val is Promise<T> {
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return (
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is(val, "Promise") &&
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isObject(val) &&
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isFunction(val.then) &&
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isFunction(val.catch)
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);
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}
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export function isString(val: unknown): val is string {
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return is(val, "String");
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}
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export function isFunction(val: unknown): boolean {
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return typeof val === "function";
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}
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export function isBoolean(val: unknown): val is boolean {
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return is(val, "Boolean");
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}
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export function isRegExp(val: unknown): val is RegExp {
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return is(val, "RegExp");
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}
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export function isArray(val: any): boolean {
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return val && Array.isArray(val);
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}
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export function isWindow(val: unknown): val is Window {
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return typeof window !== "undefined" && is(val, "Window");
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}
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export function isElement(val: unknown): val is Element {
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return isObject(val) && !!val.tagName;
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}
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export function isMap(val: unknown): val is Map<any, any> {
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return is(val, "Map");
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}
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