UMD build doesn't work via import in the browser (TypeError: Cannot set property 'React' of undefined)

When importing the UMD build (both production and development) in the browser – that is, from a <script type="module"> – an error is thrown: TypeError: Cannot set property 'React' of undefined.

The relevant code:

12: (function (global, factory) {
13:	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
14:	typeof define === 'function' && define.amd ? define(factory) :
15:	(global.React = factory());
16: }(this, (function () { 'use strict';

Throws on line 15 as global ≣ this is undefined in a module context.
Is this as simple to fix as passing this || self on line 16, or is there a catch?

Do you want to request a feature or report a bug? bug

What is the current behavior? TypeError: Cannot set property 'React' of undefined

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. https://jsfiddle.net/dja3wfc7/ (Updated)

What is the expected behavior? I would expect the import to work, as the same file works if included via <script src=...>.

Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React? React 16.7.0 (latest stable) – I have found another UMD related bug, #3037, which pertains to React 0.12.2. I have tried that version and indeed it works, it can be imported. Chrome 71, Safari 12 tested (probably all browsers)

[gaearon]

It’s not expected that UMD imports would work with import — you want ESM builds (which we don’t offer yet).

[gaearon]

I don’t remember a particular reason. If you send a PR upgrading Rollup we can look at it!