const editor = grapesjs.init({
	container: '#gjs',
  height: '100%',
  fromElement: true,
  storageManager: false,
  plugins: ['grapesjs-rulers'],
});

import grapesjs from 'grapesjs';
import plugin from 'grapesjs-rulers';
import 'grapesjs/dist/css/grapes.min.css';
import 'grapesjs-rulers/dist/grapesjs-rulers.min.css'

const editor = grapesjs.init({
  container : '#gjs',
  // ...
  plugins: [plugin],
  pluginsOpts: {
    [plugin]: { /* options */ }
  }
  // or
  plugins: [
    editor => plugin(editor, { /* options */ }),
  ],
});

const pn = editor.Panels;
const panelViews = pn.addPanel({
  id: 'options'
});
panelViews.get('buttons').add([{
  attributes: {
    title: 'Toggle Rulers'
  },
  context: 'toggle-rulers', //prevents rulers from being toggled when another views-panel button is clicked 
  label: `<svg width="18" viewBox="0 0 16 16"><path d="M0 8a.5.5 0 0 1 .5-.5h15a.5.5 0 0 1 0 1H.5A.5.5 0 0 1 0 8z"/><path d="M4 3h8a1 1 0 0 1 1 1v2.5h1V4a2 2 0 0 0-2-2H4a2 2 0 0 0-2 2v2.5h1V4a1 1 0 0 1 1-1zM3 9.5H2V12a2 2 0 0 0 2 2h8a2 2 0 0 0 2-2V9.5h-1V12a1 1 0 0 1-1 1H4a1 1 0 0 1-1-1V9.5z"/></svg>`,
  command: 'ruler-visibility',
  id: 'ruler-visibility'
}]);

editor.on('run:preview', () => editor.stopCommand('ruler-visibility'));