Samsumg Internet uses Chromium under the hood, but it doesn't always stay up-to-date with the latest version. We discovered this recently due to a bug report from a Samsung Internet user.

To fix it, we had to investigate the version of Chromium they use and then manually add that to the browser list:

const babelPlugin = babel({
  presets: [['env', {
    targets: {
      browsers: ['chrome >= 51'],
    },
    // ...
});

But this requires a bit or work on the user's side. Since browserlist support Samsung Internet, ideally we'd be able to do this:

const babelPlugin = babel({
  presets: [['env', {
    targets: {
      browsers: ['last 2 Samsung versions'],
    },
    // ...
});

I haven't looked into whether this can be done solely on the babel-preset-env side, or if it would require changes to http://kangax.github.io/compat-table. If the latter is the case, maybe we can loop in @poshaughnessy for help making that happen?