D3 has been written in ES modules since the beginning of 2016 when we adopted Rollup for bundling. The difference now is that we’re adopting ES2015 language fea

D3 has been written in ES modules since the beginning of 2016 when we adopted Rollup for bundling. The difference now is that we’re adopting ES2015 language features that can’t be transpiled (namely for-of). We didn’t get around to it for 6.0 (mostly for fear of breaking backwards-compatibility in Node), but we plan on adopting type: "module" for Node in the nearish future. In the meantime you can consume D3 as an ES module using Skypack if desired. https://cdn.skypack.dev/d3 https://cdn.skypack.dev/d3