Slack feature flags

gistfile1.js

var classname = "Slack.FeatureFlagManager";
var classmethod = "- isFeatureEnabled:";
var methodsignature = "(bool) - isFeatureEnabled:(pointer)";
try {
  var hook = ObjC.classes['Slack.FeatureFlagManager']['- isFeatureEnabled:'];
 
  //(bool) - isFeatureEnabled:(pointer)
  Interceptor.attach(hook.implementation, {
    onEnter: function (args) {
      send("[Call_Stack]\nClass: " + classname + "\nMethod: " + methodsignature + "\n");
      this.s = ""
      this.s = this.s + "[Hook_Stack]\n"
      this.s = this.s + "Class: " + classname + "\n"
      this.s = this.s + "Method: " + methodsignature + "\n"
      this.replace = false;
      if (classmethod.indexOf(":") !== -1) {
        var params = classmethod.split(":");
        params[0] = params[0].split(" ")[1];
        for (var i = 0; i < params.length - 1; i++) {
          try {
            this.s = this.s + "Input: " + params[i] + ": " + new ObjC.Object(args[2 + i]).toString() + "\n";
            var feature = new ObjC.Object(args[2 + i]).toString();
            if (feature == "story_time" || feature == "ios_voice_messages" || feature == "modern_tab_design" || feature == "ios_modern_text_input" || feature == "qr_code_invite") {
              this.replace = true;
            }
          } catch (e) {
            this.s = this.s + "Input: " + params[i] + ": " + args[2 + i].toString() + "\n";
          }
        }
      }
    },

    //(bool) - isFeatureEnabled:(pointer)
    onLeave: function (retval) {
      this.s = this.s + "Output: " + retval.toString() + "\n";
      if (this.replace) {
      	retval.replace(1);
      }
    }
  });
} catch (err) {
  send("[!] Exception: " + err.message);
  send("Not able to hook \nClass: " + classname + "\nMethod: " + methodsignature + "\n");
}