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Installation via esy

This page is a detailed explanation on how to install Reason with esy Easy package management for native Reason, OCaml and more, both manually and using a template.

Reason can be installed with a package manager like opam also, check the installation page for more details.

Requirements

System Requirements:

  • Node.js 16.14 or later.
  • macOS, Windows (including WSL), and Linux are supported.

Esy is distributed via npm, install it using the following command:

npm install -g esy

It's recommended to install esy globally

Automatic

Using the hello-reason template

Manual installation

To add packages that happen to be hosted on npm, run esy add npm-package-name.

To add packages from opam's registry, prefix the package name with @opam. esy treats the npm scope @opam specially. In this case, esy will install any package name with the @opam scope directly from opam.

esy add @opam/bos

We install reason from opam using the following command:

esy add @opam/reason

Link to getting started with esy https://esy.sh/docs/en/getting-started.html See the configuration section from the complete esy docs.

To create your first Reason native CLI program, run the following commands:

git clone https://github.com/esy-ocaml/hello-reason.git
cd hello-reason

# Install all dependencies (might take a while in the first run)
esy

# Compile and run Hello.exe
esy x Hello

What's Next?

After you have successfully compiled your first example, it's time to set up your editor to get access to all the nice features such as auto-completion. Later on you can check out the language basics to get a basic understanding of all the Reason language constructs.