When I was trying to improve type inference of fromJS, I encountered a problem: My definition requires newer version of TypeScript, but when I tried to upgrade, I got a bunch of errors, most of those are linting errors (which can be fixed) but some of them are runtime errors caused by the tools themselves (e.g. dtslint failed to download TypeScript 3.x, gulp failed to run in Node.js 11, and serveral Uncaught TypeError caused by tslint). I tried to fix them all, but to no avail.

For that reason, I suggest removing TypeScript definitions from this repo and add them to DefinitelyTyped as the people there are more familiar with TypeScript. I'm also more familiar with that repo.