This block shows how to use the d3-composite-projections with the version 5 of d3js.
The only change is the json request, that adds a then function instead of returning the data directly.
So this:
d3.json("malaysia.json", function(error, malaysia) {Becomes this:
d3.json("malaysia.json").then(function(malaysia) {The library works exactly the same way! Changes won’t bring the same job as in the v3 to v4.