Javascript code is not updating

Description of the problem:

I am building the experiment using the psychopy builder, with large amounts of the experiment done in custon code objects. However, for some reason, after a certain point in the experiment, the automatically generated .js code stops reflecting what I’ve put in the builder, including not only stuff in the costum code objects but also other more traditional objects. See here an except of code from a custom code object in the “Each Frame” section

// Loop through keyboard events to update keyStates
let keyEvents = mykb.getEvents();
// Previous status of key we are currently watching
let previousStatus = status[currentKey];
// Key, timestamp, and keyDown, of current key event
let keyIndex, key, keyStatus;
for (let i = 0; i < keyEvents.length; i++) {
    // Current key event
    key = keyEvents[i].pigletKey;
    keyStatus = keyEvents[i].status === Symbol.for('KEY_DOWN')? 'down': 'up';
    // Index of this key in keysWatched. NB findIndex not supported by IE
    keyIndex = keysWatched.indexOf(key);
    // Key is one that we watch; update its status
    if (keyIndex !== -1) {
        status[keyIndex] = keyStatus;

This code continues for a fair few lines

But then see here the complete function for this bit object - routine_2afc_stimRoutineEachFrame

function routine_2afc_stimRoutineEachFrame() {
  return async function () {
    //------Loop for each frame of Routine 'routine_2afc_stim'-------
    // get current time
    t = routine_2afc_stimClock.getTime();
    frameN = frameN + 1;// number of completed frames (so 0 is the first frame)
    // update/draw components on each frame
    // *psych_phase* updates
    if (t >= 0.0 && psych_phase.status === PsychoJS.Status.NOT_STARTED) {
      // keep track of start time/frame for later
      psych_phase.tStart = t;  // (not accounting for frame time here)
      psych_phase.frameNStart = frameN;  // exact frame index

    if (psych_phase.status === PsychoJS.Status.STARTED && Boolean(psych_complete)) {
    // *psych_fixation_cross* updates
    if (t >= 0.0 && psych_fixation_cross.status === PsychoJS.Status.NOT_STARTED) {
      // keep track of start time/frame for later
      psych_fixation_cross.tStart = t;  // (not accounting for frame time here)
      psych_fixation_cross.frameNStart = frameN;  // exact frame index

    if (psych_fixation_cross.status === PsychoJS.Status.STARTED && Boolean(psych_complete)) {
    // check for quit (typically the Esc key)
    if (psychoJS.experiment.experimentEnded || psychoJS.eventManager.getKeys({keyList:['escape']}).length > 0) {
      return quitPsychoJS('The [Escape] key was pressed. Goodbye!', false);
    // check if the Routine should terminate
    if (!continueRoutine) {  // a component has requested a forced-end of Routine
      return Scheduler.Event.NEXT;
    continueRoutine = false;  // reverts to True if at least one component still running
    for (const thisComponent of routine_2afc_stimComponents)
      if ('status' in thisComponent && thisComponent.status !== PsychoJS.Status.FINISHED) {
        continueRoutine = true;
    // refresh the screen if continuing
    if (continueRoutine) {
      return Scheduler.Event.FLIP_REPEAT;
    } else {
      return Scheduler.Event.NEXT;

You can see it just has the boiler plate stuff.

Is there some length limit to the code that psychjs can automatically turn into actual .js code? Do I need to abandon the builder and work directly on the .js code base?

I don’t know if there is a length limit on Auto translation code components, but I would recommend that you persevere with Builder. You can have multiple code components in the same routine.