ExportFile_Issue_Depending_onSel.jsx

// Assuming a text is selected (or cursor positioned) in a TextFrame.
// ---
var tf = app.selection[0].parentTextFrames[0];
alert( tf.constructor.name );    // => TextFrame expected.

var dup = tf.duplicate();        // Duplicate the frame
dup.properties = {               // Assign some props
	contents:'test',
	textFramePreferences:{ignoreWrap:true},
	locked:false
	};

dup.exportFile( ExportFormat.INDESIGN_SNIPPET, File("~/test.idms"), false );
// => "The Specified Object does not support the desired export format"