is-what/dist/isType.js

JS type check (TypeScript supported) functions like `isPlainObject() isArray()` etc. A simple & small integration.

import { getType } from './getType.js';
import { isFunction } from './isFunction.js';
/**
 * Does a generic check to check that the given payload is of a given type. In cases like Number, it
 * will return true for NaN as NaN is a Number (thanks javascript!); It will, however, differentiate
 * between object and null
 *
 * @throws {TypeError} Will throw type error if type is an invalid type
 */
export function isType(payload, type) {
    if (!isFunction(type)) {
        throw new TypeError('Type must be a function');
    }
    if (!Object.hasOwn(type, 'prototype')) {
        throw new TypeError('Type is not a class');
    }
    // Classes usually have names (as functions usually have names)
    const { name } = type;
    return getType(payload) === name || Boolean(payload && payload.constructor === type);
}