Create mask from layer in script

You coul foe example use scriptistener code to load a layers laye mast as  a selection the target the layer you want to add the layer mast too mak it the active layer the uset the slist listener cot to add a layet masy toe the cuuuent layer.  However you need to uset the cottect scriptlistener steps not any of its "invokeCommand" steps.  Add Layer Mask woul look somethin like this:

// =======linked layer Mask========================================
function linkedlayerMask() {
var idMk = charIDToTypeID( "Mk  " );
    var desc3 = new ActionDescriptor();
    var idNw = charIDToTypeID( "Nw  " );
    var idChnl = charIDToTypeID( "Chnl" );
    desc3.putClass( idNw, idChnl );
    var idAt = charIDToTypeID( "At  " );
        var ref3 = new ActionReference();
        var idChnl = charIDToTypeID( "Chnl" );
        var idChnl = charIDToTypeID( "Chnl" );
        var idMsk = charIDToTypeID( "Msk " );
        ref3.putEnumerated( idChnl, idChnl, idMsk );
    desc3.putReference( idAt, ref3 );
    var idUsng = charIDToTypeID( "Usng" );
    var idUsrM = charIDToTypeID( "UsrM" );
    var idRvlS = charIDToTypeID( "RvlS" );
    desc3.putEnumerated( idUsng, idUsrM, idRvlS );
executeAction( idMk, desc3, DialogModes.NO );
}
// =======Un linked layer Mask========================================
function layerMask() {
var idMk = charIDToTypeID( "Mk  " );
    var desc3 = new ActionDescriptor();
    var idNw = charIDToTypeID( "Nw  " );
    var idChnl = charIDToTypeID( "Chnl" );
    desc3.putClass( idNw, idChnl );
    var idAt = charIDToTypeID( "At  " );
        var ref3 = new ActionReference();
        var idChnl = charIDToTypeID( "Chnl" );
        var idChnl = charIDToTypeID( "Chnl" );
        var idMsk = charIDToTypeID( "Msk " );
        ref3.putEnumerated( idChnl, idChnl, idMsk );
    desc3.putReference( idAt, ref3 );
    var idUsng = charIDToTypeID( "Usng" );
    var idUsrM = charIDToTypeID( "UsrM" );
    var idRvlS = charIDToTypeID( "RvlS" );
    desc3.putEnumerated( idUsng, idUsrM, idRvlS );
executeAction( idMk, desc3, DialogModes.NO );
// =======================================================
var idsetd = charIDToTypeID( "setd" );
    var desc2 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
        var ref1 = new ActionReference();
        var idLyr = charIDToTypeID( "Lyr " );
        var idOrdn = charIDToTypeID( "Ordn" );
        var idTrgt = charIDToTypeID( "Trgt" );
        ref1.putEnumerated( idLyr, idOrdn, idTrgt );
    desc2.putReference( idnull, ref1 );
    var idT = charIDToTypeID( "T   " );
        var desc3 = new ActionDescriptor();
        var idUsrs = charIDToTypeID( "Usrs" );
        desc3.putBoolean( idUsrs, false );
    var idLyr = charIDToTypeID( "Lyr " );
    desc2.putObject( idT, idLyr, desc3 );
executeAction( idsetd, desc2, DialogModes.NO );
}

The invoke commands steps  are normally not useful in Photoshop scripts and will normally cause errors