message: Debug assertion for showAdd && readOnly
diff: @@ -34,7 +34,9 @@ export default class TagsWidget extends Component.extend({ styles }) {
  super(properties);
  assert('tags-widget: You must pass in a tags array', Array.isArray(this.tags));
  assert('tags-widget: You must pass in an analytics scope', typeof this.analyticsScope === 'string');
  - if (!this.readOnly) {
  + if (this.readOnly) {
  + assert('tags-widget: showAdd=true has no effect when readOnly=true', !this.showAdd);
  + } else {
  assert(
  'tags-widget: You must pass in an addTag action when readOnly=false',
  typeof this.addTag === 'function',
  