    HighlighterView.get(cellView)

Return an array of highlighters on the cellView. Only highlighters, which are instances of this class are returned.

    // Extend the Base Highlighter Class
    const ChildHighlighterView = joint.dia.Highlighter.extend({});

    const h1 = joint.dia.HighlighterView.add(cellView, 'root', 'id1');
    const c1 = ChildHighlighterView.add(cellView, 'root', 'id2');

    const parentHighlighters = joint.dia.Highlighters.get(cellView);
    assert.ok(parentHighlighters.includes(h1));
    assert.ok(parentHighlighters.includes(c1));
    const childHighlighters = ChildHighlighterView.get(cellView);
    assert.notOk(parentHighlighters.includes(h1));
    assert.ok(parentHighlighters.includes(c1));

    HighlighterView.get(cellView, id)

Return the highlighter with given id on the cellView. The highlighter returned must be an instance of this class. If such a highlighter does not exist, `null` is returned.

    // Extend the Base Highlighter Class
    const ChildHighlighterView = joint.dia.Highlighter.extend({});

    const h1 = joint.dia.HighlighterView.add(cellView, 'root', 'h1');
    const c1 = ChildHighlighterView.add(cellView, 'root', 'c1');

    assert.equal(h1, joint.dia.Highlighters.get(cellView, 'h1));
    assert.equal(c1, joint.dia.Highlighters.get(cellView, 'c1));
    // There is no instance of ChildHighlighterView on the CellView
    assert.equal(null, ChildHighlighterView.get(cellView, 'h1));
    assert.equal(c1, ChildHighlighterView.get(cellView, 'c1));