opam_of_packagejson

This is a simple executable that takes in a package.json and outputs an opam file. It can optionally generate the META file and .install file needed.

You can simply depend on it via npm. Add this to your package.json:

"opam_of_packagejson": "bsansouci/opam_of_packagejson"

To run you can just do add an npm script that runs opam_of_packagejson -gen-meta packagejson.

It'll need some help figure out the opam dependencies. Add this to your package.json if you need to depend on opam packages:

  "opam": {
    "dependencies": {
      "opamLibThatYouDependOn": "build >=  \"1.13.3\""
    },
  },

The constraints for the version numbers are opam constraints that you can read about here.

If you want to also generate the META and .install file, add this

  "opam": {
    "installPath": "_build/src"
  },

Though the default is "_build/src"

This is roughly the same as what you'd expect to see inside a pkg/pkg.ml when using topkg to generate the .install file.

You can add -gen-install and -gen-meta to the command to generate those.

You can add libraryName under opam to control the name of the opam version of your library. If not specified, the default is to use the package.json's name.

You can also add mainModule under opam to control the name of the main outputted library file when the library is built. If not specified, the default is to use the package.json's name.