Jason Xian

Hey @nickmccurdy, I played around with different tsconfig options but couldn't seem to solve the issue either. I agree that updating the target to es6 should fix the puppeteer errors...

I had the same issue and traced the error to `if not np.isreal(value):` on [rl/core.py](https://github.com/keras-rl/keras-rl/blob/master/rl/core.py). This section checks each value in the `info` object, but seems to break when given...

This is a Webpack build issue, not related to the package. An easy fix here would be to install this plugin in any dependent application: https://www.npmjs.com/package/node-polyfill-webpack-plugin