with a TypeScript or Flow frontend codebase?

Before the codebase was opensourced, I was working on it in the private repository and created an issue in there, Consider using Flow or TypeScript in the Front-End Codebase, that has since been copied to the public repository (thanks @maestromac!).

For those new to types, here's a post from Preethi Kasireddy about types, Why use static types in JavaScript? (Part 1)

Also, here's a fairly recent episode from the Script and Style podcast about types in JavaScript, Static Typing for JavaScript.


I'm partial to TypeScript myself. I've written about it here before.

There appears to be a shift towards TypeScript for those that are interested in types. I wrote about it earlier this year, Is 2019 the year of TypeScript?

There is also a great episode on the React Podcast that talks about TypeScript with Jared Palmer.

Also check out the TypeScript tag on


Flow is another main option in the frontend in regards to types, although I've never used it myself.

Here are some links if you want to read up on Flow.

Take Flow for a spin in the Flow REPL

Other Options

I've narrowed it down to TypeScript and Flow as they are the most popular, but feel free to bring others to the table to discuss, e.g. Elm, Reason.

Vanilla JS🍦

If you really don't want to see the codebase converted to use types, that's OK too.

same old stuff gif from

Are static types something that would interest people in the community who are contributing to or are thinking about contributing to the frontend codebase? Feel free to jump on over to the GitHub issue and comment there.

Debate animated gif from

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