Photoshop PNG export script with no popups. Based on https://www.reddit.com/r/gamemaker/comments/346v82/photoshop_script_for_you_save_as_png/

exportpng.jsx

// Exports a saved multi-layered file as a .png in the same directory.
function exportPNG() {
    // Confirm the document has already been saved and so has a path to use
    try {
        app.activeDocument.save();
    } catch(e) {
        alert("Could not export PNG as the document is not saved.\nPlease save and try again.")
        return
    }

    // Store the active doc handle in variable
    var doc = app.activeDocument;
    
    // Check there is at least 1 visible layer.
    var foundVisible = false;
    for (i = 0; i < doc.layers.length; i++) {
        if (doc.layers[i].visible) {
            foundVisible = true;
            break;
        }
    }
    
    if (!foundVisible) return;
    
    // Set up PNG save options.
    pngOptions = new PNGSaveOptions();
    pngOptions.compression = 9;
    pngOptions.interlaced = false;
    
    // Set up destination path.
    savePath = File(doc.path + "/" + doc.name.replace(/\.[^\.]+$/, '.png'));
    
    // Save!
    doc.saveAs(savePath, pngOptions, true, Extension.LOWERCASE);
    
    // Just in case, make sure the active document is the orignal one.
    app.activeDocument=doc;
}

exportPNG();