message: Fix assert condition mistake in previous patch
diff: @@ -62,7 +62,7 @@ import app, { App } from './app';
  public mount(element, options: any = {}) {
  - console.assert(!!this.element, 'Component already mounted.')
  + console.assert(!this.element, 'Component already mounted.')
  this.options = options = Object.assign(this.options || {}, options);
  this.element = element;
  