Avoid webpack to insert setImmediate

[ai]

Another optimization by Size Limit profiling data.

- Package size: 5.83 KB
+ Package size: 4.41 KB

Webpack inserts setImmediate polyfill (most of your users will use webpack). And setImmediate brings process polyfill. But there is no need in setImmediate polyfill here.

This trick will hide setImmediate from Webpack and save 1 KB gzipped JS for your users.

[theKashey]

Year, I've tried it. Should be safe, as long this function will be called only on componentDidMount - ie will be ok if window does not exists in server env.
(just remembering your PR to remove document access for Jest)

[theKashey]

4.41kb confirmed.