Function deviceEval

deviceEval(
    code: string,
    opts?: EvalOpts,
    device: EspruinoDevice,
    evalReplyPrefix: string,
    debug: boolean,
    warn: (m: string) => void,
): Promise<string>
Evaluates some code on an Espruino device.

Options:
- timeoutMs: how many millis to wait before assuming code failed. If not specified, device.evalTimeoutMs is used as a default.
- assumeExlusive: assume device is not producing any other output than for our evaluation
A random string is created to pair eval requests and responses. code will be run on the device, with the result wrapped in JSON, and in turn wrapped in a object that is sent back.

The actual code that gets sent to the device is then: \x10${evalReplyPrefix}(JSON.stringify({reply:"${id}", result:JSON.stringify(${code})}))\n

For example, it might end up being: \x10Bluetooth.println(JSON.stringify({reply: "a35gP", result: "{ 'x': '10' }" }))\n
Parameters
- code: string
  Code to evaluation
- opts: EvalOpts = {}
  Options for evaluation
- device: EspruinoDevice
  Device to execute on
- evalReplyPrefix: string
  How to send code back (eg Bluetooth.println, console.log)
- debug: boolean
  If true, the full evaled code is printed locally to the console
- warn: (m: string) => void
  Callback to display warnings
Returns Promise<string>