Request API using URLs Request and mutate data using a standard interface.
The standard interface to read and mutate data.
Returns an object that represents data at a given URL.
It can be consumed as both an Observable (with .subscribe) and a Promise (with .next).
A path is a string starting with a forward slash e.g. '/user'
io('/user').next(auth => {})
io('/user').subscribe(auth => {})
io('/user', 'SIGN_OUT')
io('/user', 'SIGN_IN', {id, pass})