Batching calls

Features

• Added batch() method for sending multiple queries in a single network call.

Info

The batch() method has a single argument - URI collector function. URI collector function should return an array of URIs which should be executed in a single network call by batch().
In order to simplify creation of URIs, URI collector function passed to the batch() method receives a special instance of Api, implementing IBatchApi interface. Almost all functions from Api are available in IBatchApi, with the same signatures as in Api but with one difference - all of them return a string.

Usage

// Let's `api` to be an Api instance
api.batch(batchApi => {
    // we should return an array of URIs (path + query portion)
    return [
        // we can directly write `/USER/count`, but we can use a familiar api instead
        batchApi.count('USER'),

        // URI to get metadata for TASK object
        batchApi.metadata('TASK', ['fields']),

        // another URI
        batchApi.metadata('PROJ', ['collections'])
    ]
})