I don't think this is possible, but afaik the resolution of module names is up to module loaders so there might a loader implementation that does support this.
Until then, you could use an intermediate "module file" at lib/things/index.js
that just contains
export * from 'ThingA';
export * from 'ThingB';
export * from 'ThingC';
and it would allow you to do
import {ThingA, ThingB, ThingC} from 'lib/things';