ES5 properties and coffee script

bad.coffee

Function::property = (prop, desc) ->
    Object.defineProperty this.prototype, prop, desc

class Foo
  @property 'neat'
    get: ->
      42

class Bar extends Foo
  @property 'neat'
    get: ->
      super

# 42
alert(new Foo().neat)

# exception
alert(new Bar().neat)

better.coffee

Function::property = (prop, desc) ->
    Object.defineProperty this.prototype, prop, desc

class Foo
  @property 'neat'
    get: ->
      42

class Bar extends Foo
  @property 'neat'
    get: ->
      Bar.__super__.neat

# 42
alert(new Foo().neat)

# 42
alert(new Bar().neat)

Better setup (non-enumerable)

Object.defineProperty Function.prototype, 'get',
  configurable: yes
  writable: yes
  value: (prop, get) ->
    Object.defineProperty @prototype, prop, {get}

Object.defineProperty Function.prototype, 'set',
  configurable: yes
  writable: yes
  value: (prop, set) ->
    Object.defineProperty @prototype, prop, {set}

Object.defineProperty Object.prototype, 'getSuper',
  configurable: yes
  writable: yes
  value: (prop) ->
    (Object.getOwnPropertyDescriptor @constructor.__super__, prop).get.apply @

Object.defineProperty Object.prototype, 'setSuper',
  configurable: yes
  writable: yes
  value: (prop) ->
    (Object.getOwnPropertyDescriptor @constructor.__super__, prop).set.apply @

Hi all and thx for the example(s),

@ben-x9:
It works with setters when one changes the getter-definition

Object.defineProperty Function.prototype, 'get',
  configurable: yes
  writable: yes
  value: (prop, get) ->
    Object.defineProperty @prototype, prop, {
     get: get
     configurable: yes
     writable: yes
   }

to allow a following setter-definition. The code as-is throws 'Cannot redefine property ' in Chrome.

cheers, Andreas