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index.ts
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index.ts
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// eslint-disable-next-line @typescript-eslint/unbound-method
const toString = Object.prototype.toString;
export const is = (val: unknown, type: string) => toString.call(val) === `[object ${type}]`;
export function isDef<T = unknown>(val?: T): val is T {
return typeof val !== 'undefined';
}
export const isUnDef = (val: any): val is undefined => !isDef(val);
export const isNull = (val: any): val is null => val === null;
export const isNullOrUnDef = (val: any) => isUnDef(val) || isNull(val);
export const isString = (val: any): val is string => is(val, 'String');
export function isNumber(val: any): val is number {
return is(val, 'Number');
}
export function isBoolean(val: unknown): val is boolean {
return is(val, 'Boolean');
}
export const isObject = (val: any): val is Record<string, any> => val !== null && is(val, 'Object');
export const isArray = (val: any): val is any[] => Boolean(val) && Array.isArray(val);
export const isEmpty = (val: any) => {
if (isNullOrUnDef(val)) return true;
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;
};
// eslint-disable-next-line @typescript-eslint/ban-types
export function isFunction(val: unknown): val is Function {
return typeof val === 'function';
}
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 isDate(val: unknown): val is Date {
return is(val, 'Date');
}
export function isRegExp(val: unknown): val is RegExp {
return is(val, 'RegExp');
}
export function isWindow(val: any): val is Window {
return typeof window !== 'undefined' && is(val, 'Window');
}
export function isElement(val: unknown): val is Element {
return isObject(val) && !!val.tagName;
}
export function isHTMLElement(val: unknown): val is HTMLElement {
return isObject(val) && 'accessKey' in val;
}
export const isServer = typeof window === 'undefined';
export const isClient = !isServer;