Async flow for ES5/6 (Purely thought / psuedocode)

flow.js

flo = flow
  // Add method signature and arguments to be invoked
  .add(/* [name, ]function[, arguments...] */)
  
  // Attach thenable to previous method signature
  .then(function () {
    // skip(/* string name | int groups */)
    flo.skip('name') // this.skip vs flo.skip vs (skip argument on argument list, after next)
    
    // next(/* string name | int group */)
    //   sugar for #jump(/* string name | int group */)
    flo.next() // this.next vs flo.next vs (next argument on argument list)
  })
  
  // Add another grouping
  .add('name', request, args)
  .then(/* function(args...) */)
  
  // Un-attached thenable, invoked if everything goes okay
  // #skip('global') to skip
  .then(...)
  .catch(/* [ErrorType, ]function(args...) */)
  .finally(/* function args(...) */)