Allow outputFilename to be null

[NicolasBonduel]

I would like to avoid saving an output file completely.

[bj00rn]

I would like to see this too. My use case is custom formatting using additionalFiles

[codepunkt]

@NicolasBonduel @bj00rn Feel free to open a PR for this, it shouldn't be too large of a change and I'd be happy to merge it if it updates documentation and automated tests accordingly.

@bj00rn As a workaround, you can use

additionalFiles: {
  'oss-licenses.json': (packages) => {
    /* your transform logic */
  }
}

If you're not transforming to a different json structure, but to a completely different file format, you'd have to rename the oss-licenses.json file after building, e.g. "postbuild": "mv dist/oss-licenses.json dist/oss-licenses.xml"