Adding labels to d3 bar chart

bar-chart-labels.component.ts

private labels: any; // Labels

private draw() {
  // ...
  this.drawLabels();
}

private repaint() {
  // ...
  this.drawLabels();
}

private drawLabels() {
  this.labels = this.mainContainer.selectAll('.label')
    .remove().exit()
    .data(this.dataSource)
    .enter().append('text').attr('class', 'label')
    .attr('x', d => this.xScale(d.name) + (this.xScale.bandwidth() / 2))
    .attr('y', d => this.yScale(d.value) - 5))
    .text(d => Math.floor(d.value));
}