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| 'string'
| 'number'
| 'object'
| 'array'
| 'date'
| 'function'
| 'boolean'
| 'null'
| 'regexp'
| 'error'
| 'map'
| 'set'
| 'undefined';
export const DATE_REGEX = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)((-(\d{2}):(\d{2})|Z)?)$/;
/**
* Get the generic type of the given value. Unlike `typeof`, the returned type will be a generic type. For example,
* calling `typeOf([])` will return `array` instead of `object`.
* @param value
* @returns {GenericType}
*/
export function typeOf(value: unknown): GenericType {
return toString
.call(value)
.replace(/\[object /, '')
.replace(/]/, '')
.toLowerCase() as GenericType;
}
/**
* Check if the given value is a string.
* @param value
* @returns {boolean}
*/
export function isString(value: unknown): value is string {
return typeof value === 'string';
}
/**
* Check if the given value is a number.
* @param value
* @returns {boolean}
*/
export function isNumber(value: unknown): value is number {
return typeof value === 'number' && !isNaN(value);
}
/**
* Check if the given value is an even number.
* @param {number} n
* @returns {boolean}
*/
export function isEven(n: number): n is number {
return n % 2 === 0;
}
/**
* Check if the given value is an odd number.
* @param {number} n
* @returns {boolean}
*/
export function isOdd(n: number): n is number {
return n % 2 !== 0;
}
/**
* Check if the given value is integer.
* @param {number} n
* @returns {boolean}
*/
export function isInt(n: unknown): n is number {
if (typeof n !== 'number' || isNaN(n)) return false;
return n % 1 === 0;
}
/**
* Check if the given value is float.
* @param {number} n
* @returns {boolean}
*/
export function isFloat(n: unknown): n is number {
if (typeof n !== 'number' || isNaN(n) || !isFinite(n)) return false;
return n % 1 !== 0;
}
/**
* Check if the given value is a numeric string.
* @param {string} value
* @returns {boolean}
*/
export function isNumberString(value: unknown): value is string {
if (typeof value !== 'string' || value === '') return false;
return /^-?(?:\d+\.?\d*|\.\d+)$/.test(value);
}
/**
* Check if the given value is a unit string (e.g, 120px, -10.5pt, -100cm).
* @param {string} value
* @returns {boolean}
*/
export function isUnitString(value: unknown): value is string {
if (typeof value !== 'string' || value === '') return false;
return /^-?(\d+\.?\d*|\.\d+)([a-zA-Z]+|%)$/.test(value);
}
/**
* Check if the given value is a pure object (not array, date, etc).
* @param value
* @returns {boolean}
*/
export function isObject<T extends Record<string, unknown>>(value: unknown): value is T {
if (typeof value !== 'object' || value === null) return false;
const proto = Object.getPrototypeOf(value);
return proto === Object.prototype || proto === null;
}
/**
* Check if the given value is an object-like (not array, date, etc).
* @param value
* @returns {boolean}
*/
export function isObjectLike(value: unknown): value is object {
return typeOf(value) === 'object';
}
/**
* Check if the given value is an array.
* @param value
* @returns {boolean}
*/
export function isArray(value: unknown): value is unknown[] {
return Array.isArray(value);
}
/**
* Check if the given value is a date object.
* @param value
* @returns {boolean}
*/
export function isDate(value: unknown): value is Date {
return typeOf(value) === 'date';
}
/**
* Check if the given value is a date string.
* @param {string} value
* @returns {boolean}
*/
export function isDateString(value: unknown): value is string {
if (typeof value !== 'string' || value === '') return false;
const beginDate = new Date(0);
const currentDate = new Date(value);
return !isNaN(currentDate.getTime()) && currentDate > beginDate;
}
/**
* Check if the given value is a function.
* @param value
* @returns {boolean}
*/
// eslint-disable-next-line
export function isFunction(value: unknown): value is Function {
return typeof value === 'function';
}
/**
* Check if the given value is a boolean.
* @param value
* @returns {boolean}
*/
export function isBoolean(value: unknown): value is boolean {
return typeof value === 'boolean';
}
/**
* Check if the given value is a boolean string.
* @param {string} value
* @returns {boolean}
*/
export function isBooleanString(value: unknown): value is string {
return value === 'true' || value === 'false';
}
/**
* Check if the given value is a map.
* @param value
* @returns {boolean}
*/
export function isMap(value: unknown): value is Map<unknown, unknown> {
return typeOf(value) === 'map';
}
/**
* Check if the given value is a set.
* @param value
* @returns {boolean}
*/
export function isSet(value: unknown): value is Set<unknown> {
return typeOf(value) === 'set';
}
/**
* Check if the given value is a regular expression.
* @param value
* @returns {boolean}
*/
export function isRegExp(value: unknown): value is RegExp {
return typeOf(value) === 'regexp';
}
/**
* Check if the given value is an error object.
* @param value
* @returns {boolean}
*/
export function isError(value: unknown): value is Error {
return typeOf(value) === 'error';
}
/**
* Check if the given value is a defined value.
* @param value
* @returns {boolean}
*/
export function isDefined(value: unknown): value is NonNullable<unknown> {
return !isNullish(value);
}
/**
* Check if the given value is a nullish, including NaN.
* @param value
* @returns {boolean}
*/
export function isNullish(value: unknown): value is null | undefined | number {
return value === null || value === undefined || (typeof value === 'number' && isNaN(value as number));
}
/**
* Check if the given value is a falsy but excludes 0, negative number, and empty string.
* @param value
* @returns {boolean}
*/
export function isFalsy(value: unknown): boolean {
return isNullish(value) || (typeof value === 'boolean' && !value);
}
/**
* Check if the given value is a truthy value.
* @param value
* @returns {boolean}
*/
export function isTruthy(value: unknown): boolean {
return !isFalsy(value);
}
/**
* Check if the given value is a positive value, including 0.
* @param value
* @returns {boolean}
*/
export function isPositive(value: unknown): value is number {
return typeof value === 'number' && value >= 0;
}
/**
* Check if the given value is an empty value. This includes empty string, empty array, and empty object.
* @param value
* @returns {boolean}
*/
export function isEmpty(value: unknown): value is string | number | unknown[] | Record<string, unknown> {
if (isNullish(value)) return true;
if (isString(value)) return (value as string).length === 0;
if (isArray(value)) return (value as unknown[]).length === 0;
if (isObject(value)) return Object.keys(value as Record<string, unknown>).length === 0;
if (typeof value === 'number') return value <= 0;
if (isSet(value) || isMap(value)) return (value as Set<unknown>).size === 0;
return false;
}
/**
* Check if the current environment is a browser.
* @returns {boolean}
*/
export function isBrowser(): boolean {
return typeof window === 'object';
}
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