class-autobind-decorator/src/lib/isObject.js

A small framework-agnostic utility for auto-binding "class" methods to instances (with customization options) using either "legacy" decorator syntax or plain old ES5 (without needing ES2015+ polyfills).

const { toString } = Object.prototype;

// This check is "good enough" for purposes here.
export default function isObject(candidate) {
    return toString.call(candidate) === '[object Object]';
}