Research, create, improve and maintain programming languages and their tooling to enhance developer productivity and to deliver reliable, maintainable, correct and performant software with minimum effort.

A recent release of Nickel added algebraic data types and pattern matching. This blog post explains the motivation behind this addition, the design choices made, the considerations around backward compatibility and how ADTs can be useful for a configuration language.

A summary of the open-source work done by the Programming Languages & Compilers team at Tweag in the second quarter of 2024.

Implementing an equivalent to the NixOS module system in Nickel

Nickel 1.5 ships with a new contract evaluator in the LSP. Together with custom contracts, this enables a powerful and native way to extend the LSP with custom checks, from complex validation rules to enforcing security policies on your infrastructure-as-code.

We just came out of Kubecon 2024. Here are our impressions of the trends and evolutions in infrastructure, configuration management and cloud native computing

tl;dr: We’re pleased to announce the beta release of Organist, a tool designed to ease the definition of reliable and low-friction development environments and workflows, building on the combined strengths of Nix and Nickel. A mess of cables and knobs I used to play piano as a…

Explore how to write modular and reusable configuration in Nickel using its merge system.

Get better error reporting and LSP integration for your JSON Schemas in Nickel.

With Nickel releasing 1.0 I'm excited to announce the 0.1 release of Tf-Ncl, a tool for writing Terraform deployments with Nickel instead of HCL.

Today, I am very excited to announce the 1.0 release of Nickel. A bit more than one year ago, we released the very first public version Nickel (0.1). Throughout various write-ups and public talks (1, 2, 3), we’ve been telling the story of our dissatisfaction with the state of…

We went to FOSDEM23 and CfgMgmtCamp23. Here are my impressions of the trends and evolutions in infrastructure and configuration management

The Nix `with` keyword is challenging, but we transpiled it to Nickel anyway.

What's new in Nickel 0.3.1

A short dive into Nickel's reference interpreter

Why union and intersection contracts are hard in a lazy language, and how Nickel handles them.

I am excited to announce the first release of Nickel! In the original introductory blog post, I’ve written about why we, at Tweag, are developing yet another configuration language. Our goal is to empower people to write correct, programmable and maintainable configurations…

A dive into Nickel's gradual type system, which mixes dynamic and static typing

Presenting Nickel: better configuration for less Programming with contracts in Nickel Types à la carte in Nickel Great Nickel configurations from little merges grow In a previous post, I gave a taste of Nickel, a configuration language we are developing at Tweag. One cool feature…

Presenting Nickel: better configuration for less Programming with contracts in Nickel Types à la carte in Nickel Great Nickel configurations from little merges grow We are making the Nickel repository public. Nickel is an experimental configuration language developed at Tweag…