The documentation comes from the Markdown files in the source code, so is always up-to-date but available only in English. Enjoy!
npm install --save @types/d3-interpolate
This package contains type definitions for D3JS d3-interpolate module (https://github.com/d3/d3-interpolate/).
Files were exported from https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/d3-interpolate
These definitions were written by Tom Wanzek https://github.com/tomwanzek, Alex Ford https://github.com/gustavderdrache, Boris Yankov https://github.com/borisyankov, denisname https://github.com/denisname.