[Solved]-d3 v5 axis transition-d3.js

Thanks to @Mark, I realized that I was looking at the problem from the wrong perspective. It didn't come from d3 but from Typescript. The axisBottom variable is a function, and Typescript requires it to have a context when used as a callback. Binding this solves that problem, as in :

svg.select(".x")
  .transition()
    .call(x_axis.bind(this));