Using an actionHero action to send a static file (perhaps for a single page app using pushState)

fileResponder.js

exports.action = {
  name: "fileResponder",
  description: "fileResponder",
  outputExample: {},
  inputs: { required: [], optional: [] },
  run: function(api, connection, next){
    var server = api.servers.servers[connection.type];
    try{
      // the hard-coded file you want to send, relitive to site's root
      connection.params.file = "index.html" 
      server.processFile(connection);
      // no callback needed.
    }catch(e){
      console.log(e)
      connection.error = "Your connection type, `" +  connection.type + "`, can not be sent files";
      next(connection, true);
    }
  }
};

Current as of actionHero version 6.x

These days, you really should call the next() callback in your action
however, you can set data.toRender = false to ensure nothing other than the file is sent to the client