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In order to write tests in ReScript, and thus test your code directly, you can use bs-jest, which provides ReScript bindings to Jest. If you prefer, you can also use the slightly less mature bs-mocha. You can also test the generated JavaScript or TypeScript files with no extra configuration.
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genType
Auto generation of idiomatic bindings between Reason and JavaScript: either vanilla or typed with TypeScript/FlowType.
To interoperate with TypeScript with proper type information you’ll use third-party genType. Add it as a devDependency and annotate the module export you want to generate with @genType (in previous versions you’d surround annotations with square brackets).
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ReScript devs did well on prioritizing the plugin for VSCode, which works really well. With the ReScript’s watcher running, you’ll see your Type errors underlined in red, with a descriptive bubble on hover. You also get type hints, formatting, and jumps to definitions. There’s also official support for Vim (both plain Vim and Coc Language Server) and Sublime.
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As a newcomer I try to find a use for it anywhere I can, which can lead to the bad practice of rewriting code around it to impress my coworkers. To use it on JavaScript libraries you’ll have to write the correct bindings for them. This is one thing I’d like to see in JavaScript. Here are a few stage-1 proposals.
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By the way, if you’re not using Fira Code then you’re missing out on a lot of the pipe’s aesthetics.
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