@qntm-code/utils/dist/mjs/type-predicates/isPlainObject.js

A collection of useful utility functions with associated TypeScript types. All functions have been unit tested.

import { isObject } from './isObject.js';
/**
 * Determines whether the given value is a plain object.
 */
export function isPlainObject(value) {
    if (!isObject(value)) {
        return false;
    }
    const constructor = value.constructor;
    // If it has a modified constructor
    if (constructor === undefined) {
        return true;
    }
    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
    const prototype = constructor.prototype;
    // If it has a modified prototype
    if (!isObject(prototype)) {
        return false;
    }
    // If the constructor does not have an Object-specific method
    if (!prototype.hasOwnProperty('isPrototypeOf')) {
        return false;
    }
    // Most likely a plain Object
    return true;
}