Feature/class traits

[kaidesu]

What does this implement or fix?

This update brings in the ability to define and use class traits. Class traits are a means to reduce code duplication by creating and sharing reusable methods and properties through traits. Classes may then use any number of these traits as if they were part of the class itself.

Added

• Added trait expression
• Added use statement

Here's a very simple example:

trait Loggable {
  function logError(message) {
    console.log('Error: ' + message)
  }

  function logWarning(message) {
    console.log('Warning: ' + message)
  }
}

import Loggable from 'loggable'

class Player {
  use Loggable

  function debug() {
    this.logWarning('DEBUG')
    
    ...
  }
}