How to properly close stream from GM_xhr on client side?

[nikitanikolaev01081992]

Hello,
I have troubles with closing stream from GM_xhr.
I use default reader for stream and it's method cancel.
After closing with this way the script of tampermonkey is crashed.
Can you please provide instructions with proper way of closing GM_xhr's stream?

const unsubscribeStreamButton = document.querySelector('button');

new Promise((resolve, reject) => {
  GM_xmlhttprequest({
    method: 'GET', 
    url: '<WORKING_URL>', 
    responseType: 'stream'
    onreadystatechange: (data) => {
      if (data.readyState !== 2) {
        return;
      }
      resolve(data.response);
    },
    onerror: () => {reject('Something wrong')}
  })
})
.then(async (stream) => {
  const reader = stream.getReader();
  unsubscribeStreamButton.addEventListener('click', () => reader.cancel());
  
  while(true) {
    const {done, value} = await reader.read();
    
    if (done) {
      break;
    }
    
    console.log(value);
  }
  reader.cancel();
})
.catch((error) => console.log(error));

[derjanb]

Will be handled in #1579