devshell: add nix devshell for docusaurus

Author: disassembler

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -1,8 +1,29 @@
+# Dependencies
+/node_modules
+
+# Production
+/build
+
+# Generated files
 *~
 \#*
 _cache
 _site
 dist-newstyle
-node_modules
-/.docusaurus/
-/build
+.docusaurus
+.cache-loader
+
+# Misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Nix
+result
+.direnv

README.md

@@ -62,13 +62,19 @@ one commit per new post.
 
 ## Local Development
 
-One needs to install `yarn` and `nodejs`.  A basic `shell.nix` is provided so
-it's straightforward to enter `nix-shell` and use the provided `yarn`
-executable.
+One needs to install `yarn` and `nodejs`.
 
 :warning: The `yarn` package from Debian has nothing to do with the yarn we use
 here!
 
+If using Nix package manager, one can start up a development environment by running:
+
+```
+nix develop
+just setup
+just run
+```
+
 ### Installation
 
 ```

flake.lock

@@ -0,0 +1,38 @@
+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    systems.url = "github:nix-systems/default";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    treefmt-nix.url = "github:numtide/treefmt-nix";
+    treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = inputs:
+    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
+      systems = import inputs.systems;
+      imports = [
+        inputs.treefmt-nix.flakeModule
+      ];
+      perSystem = { self', system, lib, config, pkgs, ... }: {
+        # Auto formatters. This also adds a flake check to ensure that the
+        # source tree was auto formatted.
+        treefmt.config = {
+          projectRootFile = "docusaurus.config.js";
+          package = pkgs.treefmt;
+          programs.nixpkgs-fmt.enable = true;
+        };
+
+        # Default shell.
+        devShells.default = pkgs.mkShell {
+          name = "Cardano Updates";
+          inputsFrom = [
+            config.treefmt.build.devShell
+          ];
+          nativeBuildInputs = [
+            pkgs.nodejs
+            pkgs.just
+          ];
+        };
+      };
+    };
+}

flake.nix

@@ -0,0 +1,18 @@
+default:
+    @just --list
+
+# Autoformat project tree
+fmt:
+    treefmt
+
+# Run local server
+run:
+    npm start
+
+# Build static site
+build:
+    npm run build
+
+# setup first time
+setup:
+    npm install