phaser/v3/src/utils/object/IsPlainObject.js

/**
* This is a slightly modified version of jQuery.isPlainObject.
* A plain object is an object whose internal class property is [object Object].
* @method Phaser.Utils.isPlainObject
* @param {object} obj - The object to inspect.
* @return {boolean} - true if the object is plain, otherwise false.
*/
var IsPlainObject = function (obj)
{
    // Not plain objects:
    // - Any object or value whose internal [[Class]] property is not "[object Object]"
    // - DOM nodes
    // - window
    if (typeof(obj) !== "object" || obj.nodeType || obj === obj.window)
    {
        return false;
    }

    // Support: Firefox <20
    // The try/catch suppresses exceptions thrown when attempting to access
    // the "constructor" property of certain host objects, ie. |window.location|
    // https://bugzilla.mozilla.org/show_bug.cgi?id=814622
    try {
        if (obj.constructor && !({}).hasOwnProperty.call(obj.constructor.prototype, "isPrototypeOf"))
        {
            return false;
        }
    } catch (e) {
        return false;
    }

    // If the function hasn't returned already, we're confident that
    // |obj| is a plain object, created by {} or constructed with new Object
    return true;
};

module.exports = IsPlainObject;