Extension does not work when run from bazel

[Beefster09]

When running webpack via a bazel build, shell-loader fails with:

(node:17289) ExperimentalWarning: The fs.promises API is experimental
events.js:167
      throw er; // Unhandled 'error' event
      ^

Error: write EPIPE
    at WriteWrap.afterWrite [as oncomplete] (net.js:788:14)
Emitted 'error' event at:
    at onwriteError (_stream_writable.js:431:12)
    at onwrite (_stream_writable.js:456:5)
    at _destroy (internal/streams/destroy.js:40:7)
    at Socket._destroy (net.js:613:3)
    at Socket.destroy (internal/streams/destroy.js:32:8)
    at WriteWrap.afterWrite [as oncomplete] (net.js:790:10)