node js getasync with promise enlarge buffer

I am executing some cmd commands with getasync and it gives me this error:

Unhandled rejection RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stderr maxBuffer length exceeded

The output is quite large, but I need it to debug the underlying python scripts.. Is there a way to enlarge the maxBuffer? See my code:

thecaller: function(req, callback) {

const geoJSON = req.geoJSON;
const nameofinstance = req.name;
const Promise = require("bluebird");
const cmd = require('node-cmd');
const getAsync = Promise.promisify(cmd.get, { multiArgs: true, context: cmd });
getAsync(`python3 firstscript.py`)
  .then(() => getAsync(`python3 secondscript.py`))
  .then(callback(nameofplanung));

The problem arises at the first ".then"

Instead of using node-cmd you can do something like the following

https://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options

What you want to set is the maxBuffer option.

Example slightly modified:

const { exec } = require('child_process');
const execAsync = function(cmd){ return new Promise((res,rej)=>{
  exec(cmd,{maxBuffer:4*1024*1024}, (error, stdout, stderr) => {
    if (error) {
      console.error(`exec error: ${error}`);
      rej(err)
    }
    console.log(`stdout: ${stdout}`);
    console.error(`stderr: ${stderr}`);
    res(stdout);
  });
})}
execAsync('ls').then(r=>...).catch(e=>...)