lib is not exported from package.json
I had trouble with tree shaking with next.js so I had to use

```
  modularizeImports: {
    '@phosphor-icons/react': {
      transform: '@phosphor-icons/react/dist/icons/{{member}}',
    },
}
```
in my next.config.js to make the tree shaking work, but that broke IconContext because it tried to import it from icons as well.
so I exported it in package.json and now I can import like so:
import { IconContext } from '@phosphor-icons/react/dist/lib/context'

I think the lib  inside dist should be exported like the icons.