How to iterate through groups, selecting tracks to solo and waiting for Pro Tools to finish recording a series of stems

You could rearrange things like this:

function getGroup(name) {
    var groupList = sf.ui.proTools.mainWindow.tables.whoseTitle.contains('Group').first;
    return groupList.childrenByRole("AXRow").allItems.map(function (r) {
        return {
            row: r,
            selectBtn: r.childrenByRole("AXCell").first.children.first,
            name: r.childrenByRole("AXCell").allItems[1].children.first.title.value.match(/^.+ - ([^(]+)/)[1].replace(/ $/, ''),
        };
    }).filter(function (r) { return r.name == name })[0];
}

function selectGroup(name) {
    var grp = getGroup(name);
    if (!grp) { log('Error', 'Group "' + name + '" not found'); throw 0; }
    grp.selectBtn.mouseClickElement({});
}

function waitUntilProToolsStopsPlaying() {
    while (true) {

        sf.engine.checkForCancellation();

        if (!sf.ui.proTools.isPlaying)
            break;

        sf.wait({ intervalMs: 500 });
    }
}

function getGroupsContaining(name) {
    var groupList = sf.ui.proTools.mainWindow.tables.whoseTitle.contains('Group').first;
    return groupList.childrenByRole("AXRow").allItems.map(function (r) {
        return {
            name: r.childrenByRole("AXCell").allItems[1].children.first.title.value.match(/^.+ - ([^(]+)/)[1].replace(/ $/, ''),
        };
    }).filter(function (r) { return r.name.includes(name) });
}

function makeStem(stemName) {
    selectGroup(stemName);

    sf.wait({
        intervalMs: 30,
    });

    sf.ui.proTools.appActivateMainWindow();

    sf.ui.proTools.mainWindow.counterDisplay.mouseClickElement({
        relativePosition: { x: 299, y: 67 }
    });
    sf.keyboard.press({ keys: 'shift+s' });

    sf.wait({
        intervalMs: 30,
    });

    selectGroup("StemRecTrack");

    sf.wait({
        intervalMs: 30,
    });

    sf.ui.proTools.selectedTrack.trackScrollToView();
    sf.ui.proTools.selectedTrack.popupButtons.whoseTitle.is('Playlist selector').first.popupMenuSelect({
        menuPath: ["New..."],
    });

    sf.wait({
        intervalMs: 50,
    });

    sf.ui.proTools.windows.whoseTitle.is('').first.buttons.whoseTitle.is('OK').first.elementClick();

    sf.ui.proTools.memoryLocationsGoto({
        memoryLocationNumber: 325,
    });

    sf.wait({
        intervalMs: 50,
    });

    sf.ui.proTools.mainWindow.groups.whoseTitle.is('Transport View Cluster').first.groups.whoseTitle.is('Normal Transport Buttons').first.buttons.whoseTitle.is('Record Enable').first.elementClick();

    sf.ui.proTools.mainWindow.groups.whoseTitle.is('Transport View Cluster').first.groups.whoseTitle.is('Normal Transport Buttons').first.buttons.whoseTitle.is('Play').first.elementClick();

    waitUntilProToolsStopsPlaying();
}

function main() {
    let stemGroupNames = getGroupsContaining('_Stem').map(g => g.name);

    stemGroupNames.forEach(makeStem);
}

main();