General Memory leaks when using the quill editor

[JeffMosaic]

Quill appears to be leaking memory in general. In my current use case I have an application that creates and removes many instances of Quill on a single page. Doing some memory leak analysis it appears that many of the event emitters used between the quill editor and the keyboard/scroll/modules systems result in memory leaks.

Steps for Reproduction

While a bit of a crude reproduction I was able to use the playground to reproduce a form of this memory leak.

1. Visit https://quilljs.com/playground/
2. Enter the following into JS section of the playground

var lastId = 0;

setInterval(() => {
  // Proxy metric to show growth only works in chrome
  console.log(performance.memory)
}, 5000)

document.getElementById('add-editor').onclick = () => {
  var el = document.createElement('div');
  var id = `editor-container-${lastId++}`;
  el.id = id;
  var existingArea = document.getElementById('editor-area');
  existingArea.append(el);
  var largeValue = new Array(999999);
  largeValue.fill(9);
  new Quill('#' + id, {
    modules: {
      toolbar: null
    },
    placeholder: 'Compose an epic...',
    theme: 'snow',  // or 'bubble',
    foo: largeValue
  });
}

document.getElementById('remove-editor').onclick = () => {
  var targetEditor = `editor-container-${--lastId}`;
  document.getElementById(targetEditor).remove();
}

3. Enter the following into the html section of the playground

<div>
  <button id="add-editor">Add Editor</button>
  <button id="remove-editor">Remove Editor</button>
  <div id="editor-area"></div>
</div>

4. Create multiple editors
5. Remove those editors

Expected behavior:
Memory should eventually go down and stay down

Actual behavior:
Memory keeps climbing higher and higher with each new set of added/removed editors

Platforms:
MacOS Monterey 12.5.1 Chrome 109.0.5414.87 (but I suspect this applies to many other versions)

Version:
1.3.7

[JeffMosaic]

This might be related to #3644 but given #3359 I am unsure of the state of this project

[quill-bot]

Quill 2.0 has been released (announcement post) with many changes and fixes. If this is still an issue please create a new issue after reviewing our updated Contributing guide 🙏