Quill is awesome and easy to extensible.

Paste this code to your project

const editor = new Quill('#quill-editor', {
  bounds: '#quill-editor',
  modules: {
    toolbar: this.toolbarOptions
  },
  placeholder: 'Free Write...',
  theme: 'snow'
});

  /**
   * Step1. select local image
   *
   */
function selectLocalImage() {
  const input = document.createElement('input');
  input.setAttribute('type', 'file');
  input.click();

  // Listen upload local image and save to server
  input.onchange = () => {
    const file = input.files[0];

    // file type is only image.
    if (/^image\//.test(file.type)) {
      saveToServer(file);
    } else {
      console.warn('You could only upload images.');
    }
  };
}

/**
 * Step2. save to server
 *
 * @param {File} file
 */
function saveToServer(file: File) {
  const fd = new FormData();
  fd.append('image', file);

  const xhr = new XMLHttpRequest();
  xhr.open('POST', 'http://localhost:3000/upload/image', true);
  xhr.onload = () => {
    if (xhr.status === 200) {
      // this is callback data: url
      const url = JSON.parse(xhr.responseText).data;
      insertToEditor(url);
    }
  };
  xhr.send(fd);
}

/**
 * Step3. insert image url to rich editor.
 *
 * @param {string} url
 */
function insertToEditor(url: string) {
  // push image url to rich editor.
  const range = editor.getSelection();
  editor.insertEmbed(range.index, 'image', `http://localhost:9000${url}`);
}

// quill editor add image handler
editor.getModule('toolbar').addHandler('image', () => {
  selectLocalImage();
});