Get All Contributors From Dependencies

get-authors-from-deps.js

const{ promisify } = require('util')
const Arborist = require('@npmcli/arborist')
const read = promisify(require('read-package-json'))
const arb = new Arborist({ path: '.' })
arb.loadActual().then(async tree => {
  const authors = {}
  const deps = []
  function store (author) {
    if (author.email && !authors[author.email]) {
      authors[author.email] = author
    }
  }
  async function walk(node) {
    if (!deps[node.path]) {
      deps.push(node.path)
      const pkg = await read(node.path + '/package.json')
      if (pkg.author) store(pkg.author)
      if (pkg.contributors) pkg.contributors.map(store)
      if (pkg.maintainers) pkg.maintainers.map(store)
    }
    if (node.children) {
      for (let [key, value] of node.children) {
        await walk(value)
      }
    }
  }
  await walk(tree)
  console.log(authors)
})