Introduction I’ve been writing plenty about Rescript this year, although I’ve taken a bit of a hiatus to focus on developing a couple (Rescript) open source libraries. I wanted to get back into blogging to answer one of the most confusing questions in the Rescript community: What is ReasonML and how does it relate to Rescript? However, it has grown into something quite a bit bigger. Instead, we’ll be talking about the relationships between a collection of several interrelated languages, and I’ll give my opinion on which you should use.

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Introduction (Note: There is a more recent version of this article) Most of my Rescript series so far has been about combining Rescript with React using create-react-app. Now that I understand Rescript better, I’m not so sure create-react-app is a good fit for it. Mostly because it’s slow. Rescript compiles JSX natively, so we shouldn’t need slow and hard-to-configure webpack. Most of create-react-app is about hiding the configuration of webpack from the end-user.

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Introduction Polymorphic variants in Rescript are strange beasts. They aren’t generally that useful in pure Rescript programming, but are frequently necessary in binding to Javascript. Polymorphic variants are extremely flexible (too flexible), but one of the most common uses is to represent a list of constant strings that a JS binding can accept. For example, the ubiquitous on function used for event handlers typically takes a string as its first parameter, as in on("click".

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