Deepstream is in maintenance mode, contributors needed

Upgrading the js client

Upgrading the deepstream js/node client to V4

We tried to keep APIs as consistent as possible on the client, with only two main changes:

Promise APIs breaks chaining

const client = deepstream()
try {
    await client.login()

    const record = client.record.getRecord(name)
    await record.whenReady()

    const data = await client.record.snapshot(name)
    const version = await client.record.head(name)
    const exists = await client.record.has(name)
    const result = await client.rpc.make(name, data)
    const users = await client.presence.getAll()
} catch (e) {
    console.log('Error occurred', e)
}

New listening callback

The listening API has been ever so slightly tweaked in order to simplify removing an active subscription.

Before when an active provider was started you would usually need to store it in a higher scope, for example:

const listeners = new Map()

client.record.listen('users/.*', (name, isSubscribed, ({ accept, reject }) => {
    if (isSubscribed) {
        const updateInterval = setInterval(updateRecord.bind(this, name), 1000)
        listeners.set(name, updateInterval)
        accept()
    } else {
        clearTimeout(listeners.get(name))
        listeners.delete(name)
    }
})

Where now we instead do:

const listeners = new Map()

client.record.listen('users/.*', (name, ({ accept, reject, onStop }) => {
    const updateInterval = setInterval(updateRecord.bind(this, name), 1000)
    accept()

    onStop(() => clearTimeout(updateInterval))
})