$ npm install serverless -g
$ npm install serverless-offline --save-dev
$ npm install ws
$ lein deps

Make sure you have something reasonable in your ~/.lein/profiles.clj:

{:repl {:dependencies [[org.clojure/tools.nrepl "0.2.12"]]
        :plugins [[cider/cider-nrepl "0.17.0"]]}}

lein figwheel server

In a new prompt:

node "resources/local/js/localserver.js"

To start a repl:

lein repl

In Emacs, M-x cider-connect, then:

    user=> (use 'figwheel-sidecar.repl-api)
    ...
    user=> (figwheel-sidecar.repl-api/start-figwheel!)
    ...
    user=> (cljs-repl)

The prompt will hang. However, that's only because you need to start the server. Luckily for you, it was just built!

To start it:

node "resources/local/js/localserver.js"

You should then see in your repl that the prompt will change:

    cljs.user=>

Then interact with the repl normally.

I need to work out if it's possible to fix this, or provide an alternate path to local development.

$ sls offline start

With Serverless, you can invoke functions and pass stub data from a file. The docs are here.

Probably, you want to put some data in a directory and then invoke locally:

serverless invoke --function functionName --stage dev --region eu-west-1 --path data/data.json

The data directory is ignored by default.

Make sure your AWS keys are available in your PATH, then:

$ serverless deploy

$ serverless deploy function -f index

$ curl -X GET <url> -H 'Content-Type: application/json'