Dist bundle is broken

[SamVerschueren]

We use the banner-webpack-plugin to add our custom exports to the end of the file. It used to work, but now I notice that it emits the following

//# sourceMappingURL=index.js.mapmodule.exports = ow.default;
module.exports.default = ow.default;
//# sourceMappingURL=index.js.map

So although we specify that it should strip the first source map url, it doesn't. I dived into the plugin and it looks like the plugin does the correct job because it does strip out that part. So no idea where I should look. I should really write something myself for this, ugh...