BREAKING: Non blocking behavior for client mutate

[wtrocki]

Motivation

Avoid blocking offline queue.
General idea is to return an error to the user instantly
and then trigger another mutation that will be enqueued as an offline one.

1. The request comes to an offline queue.
2. Return observable with error instantly (mutate().catch() will be triggered)
3. Attach observable to error object.

client.mutate.try()
.catch(error => {
    error.offlineObservable.then((data)=>{
        // Successfully mutated after error
    })
})

Tasks

• Implement nonblocking behavior
• Unify storage

[StephenCoady]

🥇 🥇 🥇

Great work!