npm installed library fails with `'~lib/bindings/wasi_unstable.ts' not found`

When I install solo-io/proxy-runtime using npm and try to build
I get the following error

```
ERROR TS6054: File '~lib/bindings/wasi_unstable.ts' not found.
   :
 4 │ import { proc_exit } from "bindings/wasi_unstable";
   │                           ~~~~~~~~~~~~~~~~~~~~~~~~
   └─ in ~lib/@solo-io/proxy-runtime/assembly/runtime.ts(4,27)
```