Use read-package-json (npm) to read package.json

[MathiasSM]

I think the package.json is being required directly, so that means stuff npm does automatically like parsing people objects like:

{
  "author": "Mathias San Miguel <mathias@example.com> (mathias.example.com)"
}

into

{
  "author": {
    "name": "Mathias San Miguel",
    "email": "mathias@example.com",
    "url": "mathias.example.com"
  }
}

is not happening, even when it'd be more intuitive to make your package.json parsing follow the standard npm parsing, so that theme developer could use the file as it is (like it's supposed to).

[MathiasSM]

My bad, it's the npm package normalize-package-data that specifically does those things (that package is required and used by read-package-json, so what I said still applies!)