/* eslint-disable-next-line no-redeclare */
/* global hasOwn, toString */
/**
* Check whether a value is a plain object or not.
*
* @memberof OO
* @param {any} obj
* @return {boolean}
*/
OO.isPlainObject = function ( obj ) {
// Optimise for common case where internal [[Class]] property is not "Object"
if ( !obj || toString.call( obj ) !== '[object Object]' ) {
return false;
}
const proto = Object.getPrototypeOf( obj );
// Objects without prototype (e.g., `Object.create( null )`) are considered plain
if ( !proto ) {
return true;
}
// The 'isPrototypeOf' method is set on Object.prototype.
return hasOwn.call( proto, 'isPrototypeOf' );
};
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