After Effects batch example

ae_batch_example.js

function uprez() {
    app.beginUndoGroup("Uprez");

    var theComps = getSelectedComps();

    if (theComps.length < 1) {  
        alert("No comps selected.");  
    } else { 
        for (var i=0; i<theComps.length; i++) {
            theComp = theComps[i];
            theComp.width = 2160;
            theComp.height = 2160;
            var theLayer = theComp.layers[1];
            theLayer.property("Transform").property("Position").setValue([theComp.width/2.0, theComp.height/2.0]);
            
            var fx_Upscale = theLayer.property("Effects").addProperty("Detail-preserving Upscale");
            fx_Upscale.property("Scale").setValue((theComp.width / getDim(theLayer)[0]) * 100.0);
        
            var fx_Levels = theLayer.property("Effects").addProperty("Levels");
            fx_Levels.property("Input Black").setValue(16.0/255.0);
            fx_Levels.property("Input White").setValue(235.0/255.0);

            // precompose so upscale doesn't cause problems with high pass preset
            thePrecomp = theComp.layers.precompose([theLayer.index], "Precomp_" + theLayer.name, true);
            var thePrecompLayer1 = thePrecomp.layers[1].duplicate();
            thePrecompLayer1.blendingMode = BlendingMode.COLOR;
            thePrecompLayer1.property("Effects").addProperty("Gaussian Blur").property("Blurriness").setValue(50.0);
            
            var theLayer1 = theComp.layers[1];
            var theLayer2 = theLayer1.duplicate();
            theLayer1.blendingMode = BlendingMode.OVERLAY; 
            theLayer1.property("Opacity").setValue("50.0");
            theLayer1.applyPreset(getPreset("HighPass.ffx", true));
            theLayer1.property("Effects").property("Monochrome On").property("Checkbox").setValue(0);
            theLayer1.property("Effects").property("Soften On").property("Checkbox").setValue(0);
            theLayer1.moveBefore(theLayer2);

            var solid = theComp.layers.addSolid([1.0, 1.0, 1.0], "Adjustment Layer 1", theComp.width, theComp.height, 1);
            solid.adjustmentLayer = true;
            solid.property("Effects").addProperty("Sharpen").property("Sharpen Amount").setValue(175.0);
        }
    }

    app.endUndoGroup();   
}

function getDim(layer) {
    //var time = app.project.activeItem.time;
    var x = layer.sourceRectAtTime(t=0, includeExtents=false).width;
    var y = layer.sourceRectAtTime(t=0, includeExtents=false).height;
    return [ x, y ];
}

function getSelectedComps() {
    var returns = [];
    for (var i=1; i<app.project.items.length+1; i++) {
        var item = app.project.items[i];
        if (item.selected==true && item instanceof CompItem) {
            returns.push(item);
        }
    }
    return returns;
}

function getPreset(filePath, local) {
    var presetPath = filePath;
    if (local==true) presetPath = new Folder((new File($.fileName)).path + "/" + presetPath);
    return File(presetPath);
}

function main() {
    uprez();
}  

main();