PredecessorId

<script>
var dependency = new kendo.data.GanttDependency({
    id: 1,
    predecessorId: 1,
    successorId: 2,
    type: 0
});
/* The result can be observed in the DevTools(F12) console of the browser. */
console.log(dependency.predecessorId); // outputs "1"
</script>