// create a variable for the current doc
var doc = app.activeDocument;

/////////////////////////
// MAIN
/////////////////////////

// suspendHistory method. Creates one history step named "Delete All Channels" from all steps inside the function named main();
doc.suspendHistory("Delete All Channels", "main()");

/////////////////////////
// FUNCTIONS
/////////////////////////

// a container function for all the steps we want to collapse down into one history step using suspendHistory
function main(){
	// Remove all Alpha Channels
	doc.channels.removeAll();
}