resizing several or all items to the same size

@JohnnyJomp – A few quick hacks to an old script:

// https://forums.adobe.com/message/10377562#10377562

#target photoshop

app.activeDocument.suspendHistory("Proportionally Resize Height of Selected Layers...", "main()");

function main() {

     preferences.rulerUnits = Units.PIXELS
     function sTT(v) {
          return stringIDToTypeID(v)
     }

     (ref = new ActionReference()).putEnumerated
          (sTT('document'), sTT('ordinal'), sTT('targetEnum'))
    len = executeActionGet(ref).getInteger(sTT('numberOfLayers'))
    
    // Loop the input prompt until a number is entered
    var newHeightInput;
    while (isNaN(newHeightInput = prompt("Enter a new height in pixels for the selected layers:", "1000")));
    // Convert decimal input to integer
    var newHeight = parseInt(newHeightInput);
    // Test if Cancel returns null, then do nothing
    if (newHeight === null) { return }
    // Test if an empty string is returned, then do nothing 
    if (newHeight === "") { return }

     for (i = 1; i <= len;) {
          (ref = new ActionReference()).putIndex(sTT('layer'), i++)
          if (typeIDToStringID((dsc = executeActionGet(ref)).getEnumerationValue(sTT(lS = 'layerSection'))) == lS + 'Content') {
               (lst = new ActionList()).putReference(ref), dsc.putList(sTT('null'), lst)
               if (!dsc.getBoolean(sTT('visible'))) {
                    executeAction(sTT('show'), dsc, DialogModes.NO)
               }
               (ref = new ActionReference()).putIndex(sTT('layer'), i - 1);
               (dsc = new ActionDescriptor()).putReference(sTT('null'), ref)
               executeAction(sTT('select'), dsc, DialogModes.NO)
               with (activeDocument.activeLayer) {
                    resize(s = newHeight / ((b = bounds)[3] - b[1]) * 100, s) 
               }
          }
     }
}

https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html