an on-one-off robust api with the mixin pattern

on-one-off.ts

// dom versus publisher subscribe naming conventions

const Handler = ( function() {

  return {}
  
} )()

type eventName: String
type eventFn: Function

let on = function( 
  name: eventName, 
  fn: eventFn
) {
}

let one = function( 
  name: eventName, 
  fn: eventFn
) {
}

let off = function( 
  name: eventName, 
  fn: eventFn
) {
}


let eventMixins = {
  on,
  one,
  off
}

const mixin = function( source, target ) {

  for ( let prop of source ) {
    if ( source.hasOwnProperty( prop ) {
           if ( prop in target ) {
           
           }
           // poor man's object mutator
           target.prototype[ prop ] = source[ prop ]
    }
  }
}

describe( 'Handler', () => {

  it( 'should trigger a callback', () => {

  } )

} )