this.editor = new Quill('#editor', {
      modules: { toolbar: "#toolbar"},
      placeholder: 'you can start here and make it a blast...',
      theme: 'snow'
});
this.editor.getModule("toolbar").addHandler("image", imgHandler);

function(a){
 console.log(a);
 // code that uploads your image and slots the resulting url into the editor goes here...
}

   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();
    });

input.setAttribute('accept', 'image/*')