How can I use Axios with Server-sent events (SSE) in the browser?

I’m trying to receive Server-sent events (SSE) in the browser. My application uses axios (v1.6.8) to make API calls. This code (courtesy of this answer) works in node:

const getStreamAxios = () => {
  axios.get('https://my-domain.com/api/getStream', {
    responseType: 'stream',
    headers: {
      'Accept': 'text/event-stream',
    }
  })
    .then(response => {
      console.log('axios got a response');
      const stream = response.data;

      stream.on('data', data => {
          console.log(data.toString('utf8'));
      });
      
    })
    .catch(e => {
      console.error('got an error', e);
    });    
}

But in the browser, the Promise is never fulfilled (i.e.: I don’t get the console message “axios got a response”). Instead I get this warning in the console:

The provided value ‘stream’ is not a valid enum value of type XMLHttpRequestResponseType.

The issue is not in the API endpoint; in addition to checking it with node, I have verified it also works with Apidog and EventSource in the browser.