install-packages/lib/promisify.js

Install dependencies using Yarn with npm fallback.

// @ts-check

module.exports = function (fn) {
  return function (...args) {
    return new Promise((resolve, reject) => {
      fn(...args, (err, ...res) => {
        if (err) return reject(err)

        if (res.length === 1) return resolve(res[0])

        resolve(res)
      })
    })
  }
}