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See theannouncementand thechangelog guide.

Converting your code to to the new syntax is done by running theupgradeSyntaxFrom2To3 converter on your project's Reason code.Make sure that your project is syntactically valid in Reason 2.Invalid code will fail to convert.

Do this at the root of your project:

npm install -g upgrade-reason-syntaxnpm install --save-dev bs-platform@2.2.2upgradeSyntaxFrom2To3 mySource/*

Make sure you did install bs-platform 2.2.2. Sometimes your lockfile might have locked it to1.x.x. 2.2.2 is also thelast version to support Reason syntax 2.

The script accepts a list of files/globs to convert. Pass as many as you want. It'll intelligently skip over any file that's not Reason.

After you're done converting your projects:

• Remove the backup files atmySource/*.backup
• Add"refmt": 3 to your bsconfig.json to make BuckleScript use the new syntax.
• Feel free to uninstall this library!

If you're on native, this is also your workflow. (So you'll need node.js).

It's a simple node.js script that takes the oldrefmt and the newrefmt3 from your project's BuckleScript 2.0.0's source atnode_modules/bs-platform, and then:

• Iterates over all your relevant files, making a backup copy
• Turns your Reason files into an AST (abstract syntax tree) usingrefmt
• Turns the ASTs into the new syntax usingrefmt3 and writes them back

That's it! Enjoy =)