How to use the nunjucks.SafeString function in nunjucks

async run(context, target, ...args) {
    const callback = args.pop();
    const data = args.shift() || {};
    const opts = args.shift() || {};

    try {
      const [name, ext] = target.split('.');
      const variant = lookup(name, context.env.components);
      if (!variant) {
        throw new Error(`Component extension - Could not find '${name}'`);
      }
      target = variant;
      opts.ext = opts.ext || (ext ? `.${ext}` : null);
      const result = await context.env.fractal.render(target, data, opts);
      callback(null, new SafeString(result));
    } catch (err) {
      callback(err);
    }
  }
};

environment.env.renderString(body(), environment.ctx, (err, html) => {
      if (err) {
        console.log(err);
        return done(err);
      }
      done(null, new SafeString(html));
    });
  };

env.render(component.name, props, (err, result) => {
      if (err) {
        return callback(err);
      }
      callback(null, new SafeString(result));
    });
  }

env.render(name, tplData, (err, result) => {
      if (err) {
        return callback(err);
      }
      callback(null, new SafeString(result));
    });
  }

module.exports = async function render(target, args, ui) {
  let html = await ui.app.render(target, ...args);
  html = ui.utils.resolveUrlRefs(html);
  return new SafeString(html);
};