initialising a vrs (git) repository with ref and object directories

vrs.js

const fs = require('fs')
const path = require('path')

const directories = ['objects', 'refs']
const command = process.argv[2]

switch (command) {
  case 'init':
    const repoPath = process.argv[3] || ''
    const gitPath = path.resolve(repoPath, '.git')

    directories.map(dir => {
      const dirPath = path.join(gitPath, dir)
      fs.mkdirSync(dirPath, { recursive: true })
    })

    console.info(`Initialised empty vrs repository in ${gitPath}`)
    process.exit(0)
  default:
    console.error(`vrs: '${command}' is not a valid vrs command`)
    process.exit(1)
}