cypress/cli/index.js

const minimist = require('minimist')

const args = minimist(process.argv.slice(2))

function installingFromNpmAsAUser () {
  // when installing from monorepo we explicitly
  // opt out of downloading. if we aren't running
  // from the root monorepo, then go ahead and
  // download and install cypress binary
  return process.env.CYPRESS_DOWNLOAD !== "0"
}

switch (args.exec) {
  case 'install':
    // only go out and download the cypress
    // binary if we're consuming this as an
    // npm package
    if (installingFromNpmAsAUser()) {
      require('./lib/download').install()
    }
    break
  default:
    require('./lib/cli').init()
}