`ppx-specs` field in build schema

[alex35mil]

In bsconfig.json schema there is sources[].ppx-specs field (screen: https://cl.ly/f27b32a53e7b).

I assumed this is ppx-flags but on a source level and I tried to apply ppx only to dev source folder but it doesn't seem to work.

  "name": "bs-log",
  "sources": [
    "src",
    {
      "dir": "examples",
      "type" : "dev",
      "ppx-specs": [
        "./_esy/ppx/build/default/bin/bin.exe"
      ]
    }
  ],

[bobzhang]

@alexfedoseev , it turns out it is a feature that we want to support, but not supported yet, sorry for the confusion, will remove it from the docs at this time. How is it different from applying ppx-flags globally?

[alex35mil]

@bobzhang This is library and I need to run ppx on examples only, not on the library modules.

[bobzhang]

@alexfedoseev I will add a field ppx-dev-flags, so that it will only be needed in dev dependencies

[bobzhang]

@alexfedoseev The challenging part is that it is hard to specify .merlin file, editor support

[aantron]

FYI for anyone else watching this issue, the .merlin file question can be resolved by generating .merlin files in each directory (as Dune does), rather than one global one.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.