d3-update.js

update() {
  // console.log(this.dataset);
  this.xScale.domain(d3.extent(this.dataset, d => new Date(+d.x)));
  this.yScale.domain([0, d3.max(this.dataset, d => +d.y)]);

  d3.transition()
    .duration(500)
    .each(() => {
      this.svg.selectAll("g.x.axis").call(this.xAxis);
      this.svg.selectAll("g.y.axis").call(this.yAxis);
      this.path.transition().attr('d', this.line);
    })
    .transition()
    .each(() => {
      this.path.data([this.dataset]);
      this.path.transition().attr('d', this.line);
    });

  this.path.exit()
    .remove();
}