Bundled versions >=1.6.0 breaks tests in node environment

[hexagon6]

See comment: 1741d3e#r34210654

Unfortunately this change (1741d3e) breaks some test setups that run on node, as import stays in the bundle, but is not yet officially supported by node (without flag). (e.g. running @storybook/addon-storyshots with jest uses node).

Is it possible to revert this change and release a new version on npm?

[hexagon6]

I've tested with 1.5.2 which works flawlessly, 1.6.1 does not.