Find all "yellow" (used) outputs from session and present in popupsearch

Other Changes I made were...

---

Instead of selecting each track one by one

sf.ui.proTools.trackSelectByName({ names: [track] });

to then get the output of the selected track, I instead used...

let track = sf.ui.proTools.trackGetByName({ name: trackName }).track;

This avoids the need for each track to be selected. :-)

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The map method in Javascript returns a new array so there is no need to declare the trackObj (that I renamed trackOutputs for clarity) outside the map function. Instead, I assigned the variable name directly to the map method.
i.e.

const trackOutputs = trackNames.map(...

You'd then change this

    trackObj.push({
        output,
    })

to this.

    return {
        output,
    }

(This will still returns an object in turn creating an array of objects)

---

I then changed what you were pushing to the trackObj. You were originally pushing an object {} rather than just a single output on each iteration of the map function.

so this...

    trackObj.push({
        output,
    })

I changed to this...

return output;

Let me know if you have more questions about this, am happy to answer them.

You could also use the filter method instead to get unique track outputs like this.

// Use filter to find unique outputs
const uniqueOutputs = trackOutputs.filter((item, index, arr) => arr.indexOf(item) === index);

I prefer the new Set way though as it's cleaner.

FWIW I came up with the below. Its close but not quite there.

let busOutputs = sf.ui.proTools.selectedTrack.outputPathButton.popupMenuFetchAllItems({ dismissMenu: true, }).menuItems
    .map(outputs => outputs['Names'])
    .filter(busses => busses.includes('bus',))
    .map(trimName => trimName[2].replace(/^(\s+)/, '').replace(/( \(\S+\))/, ''))

let physicalOutputs = sf.ui.proTools.selectedTrack.outputPathButton.popupMenuFetchAllItems({ dismissMenu: true, }).menuItems
    .map(outputs => outputs['Names'])
    .filter(outputs => outputs.includes('output'))
    .map(trimName => trimName[1].replace(/^(\s+)/, '').replace(/( \(\S+\))/, ''));

let combinedOutputs = [busOutputs, ...physicalOutputs];


//log(combinedOutputs)
const selectedOutput = sf.interaction.popupSearch({
        title: "Which Output would you like to add to?",
        items: combinedOutputs.map(output => ({ name: output })),
    }).item.name;