AI scripting export to jpeg, Antialiasing Type Optimized

Hi,

Try following snippet by Carlos

// export selection by Resolution
// carlos canto - 06/27/2020
// https://community.adobe.com/t5/illustrator/export-jpg-as-300-ppi/td-p/11244200?cid=101&cgid=18269&page=1

function main() {
    var idoc = app.activeDocument;
    var asset = idoc.assets.addFromSelection();
    asset.assetName = 'myExportedAsset';
    
    var destFolder = Folder('~/desktop');
    var resolution = 300;
    exportItem (asset, destFolder, resolution);
    
    var destPath = destFolder + '/mySaveAsFile.jpg';
    exportFileToJPEG (destPath, resolution);
}

function exportItem(item, destFolder, resolution) {
    // turn create folders off, same as unchecking the setting on the UI Export Assets window
    app.preferences.setIntegerPreference ('plugin/SmartExportUI/CreateFoldersPreference', 0); // don't create subfolders
    
    var whatToExport = new ExportForScreensItemToExport();
    whatToExport.assets = [item.assetID];
    whatToExport.artboards = ''; // don't export artboard
    whatToExport.document = true; // don't export document

    var jpgOptions = new ExportForScreensOptionsJPEG;
    jpgOptions.antiAliasing = AntiAliasingMethod.ARTOPTIMIZED; // art optimized results in jagged edges, is it a bug?
    jpgOptions.compressionMethod = JPEGCompressionMethodType.BASELINEOPTIMIZED; // BASELINESTANDARD
    jpgOptions.scaleType = ExportForScreensScaleType.SCALEBYRESOLUTION;
    jpgOptions.scaleTypeValue = resolution;
    
    activeDocument.exportForScreens (destFolder, ExportForScreensType.SE_JPEG100, jpgOptions, whatToExport);
}

main();

function exportFileToJPEG (dest, resolution) {
    
    var exportOptions = new ExportOptionsJPEG();
    var type = ExportType.JPEG;
    var fileSpec = new File(dest);
    exportOptions.antiAliasing = true;
    exportOptions.artBoardClipping = false;
    exportOptions.horizontalScale = resolution*100/72; // scaling increases image physical size, 
    exportOptions.verticalScale = resolution*100/72;
    exportOptions.qualitySetting = 100;
    app.activeDocument.exportFile( fileSpec, type, exportOptions );
}

For more reference please read following thread

https://community.adobe.com/t5/illustrator/export-jpg-as-300-ppi/m-p/11244323?page=1#M183146