is-what/dist/isInstanceOf.js

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

import { getType } from './getType.js';
import { isType } from './isType.js';
export function isInstanceOf(value, classOrClassName) {
    if (typeof classOrClassName === 'function') {
        for (let p = value; p; p = Object.getPrototypeOf(p)) {
            if (isType(p, classOrClassName)) {
                return true;
            }
        }
        return false;
    }
    else {
        for (let p = value; p; p = Object.getPrototypeOf(p)) {
            if (getType(p) === classOrClassName) {
                return true;
            }
        }
        return false;
    }
}