Support URL/URI option in options

Per the documentation, we can create a new Redis instance via:

// Connect to 127.0.0.1:6380, db 4, using password "authpassword":
new Redis('redis://:authpassword@127.0.0.1:6380/4')

At the same time there does not appear to be an equivalent solution of passing a URL if we provide options.

Am I missing this option? If not, could this be added in a future version?

Rereading the docs, I see we can do:

new Redis(url, options)

though it would still be good to allow the url to be specified in the options, so we can directly copy a configuration into the constructor.

Using ioredis 4.9.3.

[ajmas]

It would be for consistency at the very least, since currently both port and host are both available in the argument and the options. It would also allow to have a configuration of the form (which may be copied straight from a config file):

var config = {
  url: 'redis://...',
  keyPrefix: 'prefix-',
  lazyConnect: false
}

new Redis(config)

[luin]

Yes, that may be. Currently the options resolver follows the rule same as Object.assign(), so the latter one take precedence.