Rollup warning: `this` has been rewritten to `undefined`

[felipecrs]

When running rollup:

(!) `this` has been rewritten to `undefined`
https://rollupjs.org/guide/en/#error-this-is-undefined
node_modules/@formatjs/intl-utils/lib/src/diff.js
1: var __assign = (this && this.__assign) || function () {
                   ^
2:     __assign = Object.assign || function(t) {
3:         for (var s, i = 1, n = arguments.length; i < n; i++) {
...and 1 other occurrence
node_modules/@formatjs/intl-utils/lib/src/resolve-locale.js
1: var __extends = (this && this.__extends) || (function () {
                    ^
2:     var extendStatics = function (d, b) {
3:         extendStatics = Object.setPrototypeOf ||
...and 3 other occurrences

This seems to be caused by the use of @formatjs/intl-utils, which seems to have been deprecated in favor of @formatjs/ecma402-abstract.

I would upgrade it by myself and send a PR, but it seems that the newest version of the library does not provide the selectUnit function any longer. Which I'm not sure how to proceed. I found the following reference, it may help:

• https://github.com/formatjs/formatjs/issues/1934