Support relative path to rmlmapper.jar?

[phochste]

On OSX I run the example code from the README

const RMLMapperWrapper = require('@rmlio/rmlmapper-java-wrapper');
const fs = require('fs');

const rmlmapperPath = './rmlmapper.jar';
const tempFolderPath = './tmp';

const wrapper = new RMLMapperWrapper(rmlmapperPath, tempFolderPath, true);
const rml = fs.readFileSync('./test/tc01/mapping.ttl', 'utf-8');
const sources = {
  'student.csv': fs.readFileSync('./test/tc01/student.csv', 'utf-8')
};

const result = await wrapper.execute(rml, {sources, generateMetadata: false, serialization: 'turtle'});

But I get an error message:

Error: Error while executing the rules.
    at ChildProcess.<anonymous> (/Users/hochsten/github.com/MellonScholarlyCommunication/eventlog-server/node_modules/@rmlio/rmlmapper-java-wrapper/lib/wrapper.js:204:23)
    at ChildProcess.emit (node:events:519:28)
    at maybeClose (node:internal/child_process:1105:16)
    at Socket.<anonymous> (node:internal/child_process:457:11)
    at Socket.emit (node:events:519:28)
    at Pipe.<anonymous> (node:net:339:12) {
  log: 'Error: Unable to access jarfile ./rmlmapper.jar\n'
}

Node.js v20.17.0

The code works when I replace const rmlmapperPath = './rmlmapper.jar'; with the absolute path to the jar file.