Catch failed req()

[jmandel]

This isn't a problem with the code here, but in some bundler contexts (I'm seeing this with parcel), generated output looks like:

... i.e., req may wind up undefined because the bundler helpfully determined at build time that resolve exists, even though at runtime it doesn't.

A try/catch is a bit of an ad-hoc fix but it's doing the trick in this instance.

[ljoy913]

Thanks. Webpack (via create-react-app) & rollup were fine with this. I did not check parcel. Thanks!