Visible

canvas.node(0).add({
    shape: 'rect',
    size: [40, 12],
    labels: { 0: { text: '[ ]' } }
})
canvas.pause(0.5)

for (let i = 1; i < 5; i++) {
    canvas.node(i).add()
    canvas.edge([i, 0]).add({ visible: false })
    canvas.pause(0.1)
  
    canvas.node(0).label()
        .visible(false)
        .pause(0.5)
        .visible(true)
        .text(`[${Array(i).fill(0)
            .map((v, j) => j + 1).join(', ')}]`)
        .pause(0.5)
}