Writing your editor extension

Unreal.js loads extensions automatically. Extension should be devrequired and have name with prefix 'extension'. Unreal.js searches GameContent/Scripts recursively to find extensions.

"use strict"

module.exports = () => {
  console.log("Hello my first editor extension")
  class MyDelegates extends JavascriptGlobalDelegates {
    OnObjectModified(obj) {
      console.log("You just modified",obj.GetName())
    }
  }
  let MyDelegates_C = require('uclass')()(global,MyDelegates)
  let instance = new MyDelegates_C()
  instance.Bind('OnObjectModified')

  return () => {
    instance.UnbindAll()
    console.log("Bye, editor")
  }
}

And your JavascriptComponent can be running within editor by checking bActiveWithinEditor.

There can be several worlds so there is no GWorld exposed. Instead of accessing GWorld, you can retrieve by calling Root.GetEngine().GetEditorWorld().

See also

EdMode EditorViewport