globalThis.js

(function() {
    if (typeof globalThis === 'object') return;
    try {
        // This will define globalThis as a getter on the global object
        Object.defineProperty(Object.prototype, '__magic__', {
            get: function() {
                return this;
            },
            configurable: true // This makes it possible to delete the property later.
        });
        __magic__.globalThis = __magic__; // `this` is the global object in a non-strict mode function.
        delete Object.prototype.__magic__;
    } catch (e) {
        // In environments where `Object.defineProperty` is not available,
        // you can fallback to the more traditional but less correct implementations.
        if (typeof self !== 'undefined') {
            self.globalThis = self;
        } else if (typeof window !== 'undefined') {
            window.globalThis = window;
        } else if (typeof global !== 'undefined') {
            global.globalThis = global;
        } else {
            throw new Error('globalThis is not polyfillable in this environment.');
        }
    }
}());