Yarn: Set options conditionally based on value of positional argument

readme.md

# Runs node -r @babel/register src/cli.js login --identity ../local-dev/cli_id_rsa
$ yarn cli login

# Runs node -r @babel/register src/cli.js logout --identity ../local-dev/cli_id_rsa
$ yarn cli logout

# Runs node -r @babel/register src/cli.js projects
$ yarn cli projects

Idea stolen from:

npm/npm#9627 (comment)

package.json

{
  "scripts": {
    "cli": "bash -c 'node -r @babel/register src/cli.js $1 $([[ $1 =~ login|logout ]] && echo \"--identity ../local-dev/cli_id_rsa\" || echo \"\")' -- "
  }
}