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How about TypeScript/TSX? React's components and "views" are easy to type (and you get completion in your IDE) but I still have to find a convenient way to type an Immutable map where each key/value pair has a different type (the equivalent of a TypeScript object). Any idea?

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you can use the functional way of setState by passing a transaction function (state: State) => State . This allows for typed, immutable updates since the function gets passed a copy of the state.

If you need an object (say to use it in something like Redux), you have to write a wrapper like so: https://gist.github.com/ebi/d186c4297c84d562aeae

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