How to properly export an ES6 class in Node 4

Question

I defined a class in a module    use strict    var AspectTypeModule   function       module exports   AspectTypeModule   var AspectType   class AspectType                      module export AspectType   AspectType    But I get the following error message   TypeError  Cannot set property  AspectType  of undefined     at Object  lt anonymous gt       AspectType js 30 26      at Module  compile  module js 434 26             How should I export this class and use it in another module  I have seen other SO questions  but I get other error messages when I try to implement their solutions

User · Accepted Answer

If you are using ES6 in Node 4  you cannot use ES6 module syntax without a transpiler  but CommonJS modules  Node s standard modules  work the same   module export AspectType   should be  module exports AspectType   hence the error message  Cannot set property  AspectType  of undefined  because module export     undefined   Also  for  var AspectType   class AspectType                       can you just write  class AspectType                      and get essentially the same behavior

User · Answer

I had the same problem  What i found was i called my recieving object the same name as the class name  example    const AspectType   new AspectType      this screwed things up that way    hope this helps

User · Answer

I simply write it this way  in the AspectType file   class AspectType       blah blah   module exports   AspectType    and import it like this   const AspectType   require    AspectType    var aspectType   new AspectType

User · Answer

class expression can be used for simplicity       Foo js  use strict       export default class Foo    module exports   class Foo      -     main js  use strict    const Foo   require    Foo js     let Bar   new class extends Foo     constructor         super        this name    bar          console log Bar name

User · Answer

Sometimes I need to declare multiple classes in one file  or I want to export base classes and keep their names exported because of my JetBrains editor understands that better  I just use  global MyClass   class MyClass            And somewhere else   require  baseclasses js    class MySubclass extends MyClass

User · Answer

Several of the other answers come close  but honestly  I think you re better off going with the cleanest  simplest syntax  The OP requested a means of exporting a class in ES6   ES2015  I don t think you can get much cleaner than this    use strict    export default class ClassName     constructor

User · Answer

Use     aspect-type js class AspectType       export default AspectType    Then to import it     some-other-file js import AspectType from    aspect-type     Read http   babeljs io docs learn-es2015  modules for more details

User · Answer

person js  use strict    module exports   class Person      constructor firstName  lastName           this firstName   firstName         this lastName   lastName           display            console log this firstName         this lastName             nbsp      index js  use strict    var Person   require    person js     var someone   new Person  First name    Last name    someone display

User · Answer

With ECMAScript 2015 you can export and import multiple classes like this   class Person       constructor                 this type    Person            class Animal      constructor                 this type    Animal            module exports         Person      Animal      then where you use them   const   Animal  Person     require  classes     const animal   new Animal    const person   new Person      In case of name collisions  or you prefer other names you can rename them like this   const   Animal   OtherAnimal  Person   OtherPerson    require    classes     const animal   new OtherAnimal    const person   new OtherPerson

[javascript] How to properly export an ES6 class in Node 4?

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