store.gatsbyjs.org: [Browser support] fetch is undefined - missing polyfill?

Just a heads up that the site crashes IE 11 on account of fetch being undefined. As there’s not a browserslist entry in package.json my understanding is that Gatsby v2 supports >0.5, not dead, which should include a fetch polyfill for IE 11 via Babel 7 preset-env.

Obviously not many Gatsby devs will be using IE as their primary browser but I came across this repo as a reference Shopify implementation so IE support would be great to see.