Javascript version for custom decoder

ChirpStack Application Server
1

What version of Javascript does the custom plugin framework support?

I am seeing an error and I am wondering if the function I am using is supported.

Here is the error:

js vm error: ReferenceError: ‘Uint8Array’ is not defined

The offending line in the code is:

    var byteArray = new DataView( new Uint8Array(bytes).buffer );

I create the byteArray so that I can use the javascript built-in functions to parse the data.

2

I too am wondering what version of javascript the codec uses. Does it support ecmascript 6? It appears that you cannot use other functions, classes, or the ‘let’ keyword.

3

Loraserver uses this as the javascript VM, and as stated in the repo, it targets ES5:

  • Otto targets ES5. ES6 features (eg: Typed Arrays) are not supported.
4

Actually, this might be good to add to https://www.loraserver.io/lora-app-server/use/applications/ :slight_smile: Please let me know if you want to create a pull-request, else I’ll look into this later this week.

5

I just made a PR adding the comment. :wink:

1 Like
6

is there any chance to upgrade the JS vm to ES6?

7

Not until otto (the Go JS VM) supports it: https://github.com/robertkrimen/otto#caveat-emptor.