cogs/src/prune-dependencies.js

The fast file transform pipeline.

import npath from 'path';

import _ from 'underscore';

const normalize = path => npath.normalize(path);

const clean = paths => _.unique(_.map(paths, normalize));

export default file => {
  let { builds, links, requires } = file;
  requires = clean(requires);
  builds = _.difference(clean(builds), requires);
  links = _.difference(clean(links), [].concat(builds, requires));
  return _.extend({}, file, { builds, links, requires });
};