resize-observer-polyfill/src/shims/global.js

A polyfill for the Resize Observer API

// Returns global object of a current environment.
export default (() => {
    if (typeof global !== 'undefined' && global.Math === Math) {
        return global;
    }

    if (typeof self !== 'undefined' && self.Math === Math) {
        return self;
    }

    if (typeof window !== 'undefined' && window.Math === Math) {
        return window;
    }

    // eslint-disable-next-line no-new-func
    return Function('return this')();
})();