How do you repeat a script until there are no clips left in timeline?

This is my favorite fastest extend and fade script... there are many ways to do it. I like this build by
@samuel_henriques

/**
* @param {1|2|3|4|5} preset
*/
function createFades(preset) {

    sf.ui.proTools.menuClick({ menuPath: ["Edit", "Fades", "Create..."] });

    const batchFadesWin = sf.ui.proTools.windows.whoseTitle.is('Batch Fades').first;

    batchFadesWin.elementWaitFor({}, "Batch Fades Win Didn\'t Open.");

    batchFadesWin.buttons.whoseTitle.is(`Fade Preset Toggle ${preset}`).first.elementClick();

    batchFadesWin.buttons.whoseTitle.is('OK').first.elementClick();

    batchFadesWin.elementWaitFor({ waitType: "Disappear" }, "Batch Fades Win Didn\'t Close.");
};

function nudgeValue() {

    const nudgeBtn = sf.ui.proTools.mainWindow.gridNudgeCluster.nudgeControls
    const nudgeValue = nudgeBtn.nudgeValue.invalidate().value.value

    //  If has 3x : it is Timecode
    if (nudgeValue.split(":").length == 4) {

        //  If not 1 frame, set 1 frame
        if (!nudgeValue.endsWith("01.00")) sf.ui.proTools.nudgeSet({ value: "00:00:00:01.00" });

    } else {

        nudgeBtn.nudgeValuePopupButton.popupMenuSelect({
            menuPath: ["Timecode"],
        });
        sf.ui.proTools.nudgeSet({ value: "00:00:00:01.00" });
    }
}

function extendSelectionOnEitherSide(frameCount) {
    nudgeValue();
    sf.keyboard.press({ keys: 'alt+numpad minus', repetitions: frameCount, fast: true });
    sf.keyboard.press({ keys: 'cmd+numpad plus', repetitions: frameCount, fast: true });
};



function getOriginalToolSelection() {
    // Get original Tools Selection
    const originalToolSelection = sf.ui.proTools.mainWindow.cursorToolCluster.buttons.filter(btn =>
        btn.title.value == "Smart tool" ||
        btn.title.value == "Trim tool" ||
        btn.title.value == "Selector tool" ||
        btn.title.value.startsWith("Grabber tool")
    ).filter(btn => btn.value.invalidate().value === "Selected")
    return originalToolSelection
};


function setOriginalToolSelection(originalToolSelection) {
    ///Set Original Tools Selection
    originalToolSelection.map(selBtn => selBtn.title.value).indexOf("Smart Tool") > 0 ?
        originalToolSelection.filter(selBtn => selBtn.title.value === "Smart Tool")[0].elementClick() :
        originalToolSelection[0].elementClick()
};


function setGrabberObjectTool() {

    const grabberToolToolBtn = sf.ui.proTools.mainWindow.groups.allItems[2].buttons.whoseTitle.startsWith('Grabber tool').first

    grabberToolToolBtn.elementClick();
    grabberToolToolBtn.popupMenuSelect({
        isRightClick: true,
        menuPath: ['Object']
    });
};

/**
 * @param {object} param
 * @param {number} param.extendFrames
 * @param {1|2|3|4|5} param.fadesPreset
 */

function main({ extendFrames, fadesPreset }) {

    sf.ui.proTools.appActivateMainWindow();

    sf.ui.proTools.invalidate();

    // Save tool selection to use at the end
    const originalToolSelection = getOriginalToolSelection();

    // Get selected tracks names
    const selectedTrackNames = sf.ui.proTools.selectedTrackNames

    // Select grabber object tool
    setGrabberObjectTool();

    //Select tracks again to so they are selected as object
    sf.ui.proTools.trackSelectByName({ names: selectedTrackNames });

    //Extend clips
    extendSelectionOnEitherSide(extendFrames);

    //Select smart tool
    sf.ui.proTools.toolsSelect({ tool: "Smart" });

    //Select tracks again to loose object selection
    sf.ui.proTools.trackSelectByName({ names: selectedTrackNames });

    //Reset pt menus so fades are available
    sf.keyboard.press({ keys: 'n', repetitions: 2, fast: true });

    //Batch fades create
    createFades(fadesPreset);
    
    //Set original tools selection
    setOriginalToolSelection(originalToolSelection);

}


main({ extendFrames: 1, fadesPreset: 3 });

On line 123 you can see I'm only extending 1 frame you can adjust that to your own desire. Then you need to assign one of your fade presets to the correct setting to hit your fades right probably something like this (this is for a 2 frame fade, don't affect cross fades... so maybe instead you want 168 Milliseconds if you do 4 frame cross fades) play with it and see what you think.

Here's the original post where different approaches to this were taken Extend all clips by 'x' & Batch Fade using Batch Fade preset (whole timeline)

Some people did not get the version I like working but he built a couple other versions....