docs: function routeHandler (route, opts) {
     const handler = stripIndent(`   ${route.handler.toString()}`);
     const code = m('pre', { style: { border: 0, margin: 0 } }, handler);
  
     const panelOptions = { collapsed: opts.routeHandlers !== 'expanded' };
  
     // Handler is collapsed by default
     return collapsablePanel('Handler', panelOptions, code);
  }