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d3/d3.d.ts /cc @gustavderdrache @borisyankov
d3.js got a major overhaul. Its API has improved considerably. See d3 v4 changes. I'm quite excited about it, but for the time being I have to stay with v3 or abandon TypeScript for a critical class.
Fascinating article by @mbostock discussing examples of poor d3.js API pre-v4 and the rationale behind v4's API: What Makes Software Good - well worth the read no matter what walk of programming you come from.
Edit: hang on- I just saw https://github.com/tomwanzek/d3-v4-definitelytyped so perhaps @tomwanzek is already taking care of this?