code: function getTextBindingForToken(Directive, tokenText) {
      tokenText = tokenText.trim();
  
      let directiveInstances = PRIVATE.get(Directive);
  
      if (!directiveInstances) {
          directiveInstances = {};
          PRIVATE.set(Directive, directiveInstances);
      }
  
      if (!directiveInstances[tokenText]) {
          directiveInstances[tokenText] = new Directive(tokenText);
      }
  
      return directiveInstances[tokenText];
  }
docs: Returns a node handlers for the given directive
  
  @param {Directive} Directive
  @param {String} tokenText
  The token text (no curly braces)
  
  @returns {Directive}
  Returns a Directive instance. Call `.getNodeHandler` to get a handler for a given node