set up a devcontainer configuration

Author: artis3n

.devcontainer/devcontainer.json

@@ -0,0 +1,34 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/javascript-node
+{
+  "name": "Node.js",
+  // Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+  "image": "mcr.microsoft.com/devcontainers/javascript-node:1-20-bookworm",
+
+  // Features to add to the dev container. More info: https://containers.dev/features.
+  "features": {
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/devcontainers-extra/features/prettier:1": {}
+  },
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  // "forwardPorts": [],
+
+  // Use 'postCreateCommand' to run commands after the container is created.
+  // "postCreateCommand": "yarn install",
+  "postCreateCommand": "npm ci",
+
+  // Configure tool-specific properties.
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "christian-kohler.npm-intellisense",
+        "dbaeumer.vscode-eslint",
+        "esbenp.prettier-vscode"
+      ]
+    }
+  }
+
+  // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+  // "remoteUser": "root"
+}

README.md

@@ -96,6 +96,8 @@ If you intend on reporting or contributing a fix related to security vulnerabili
 
 ## Development
 
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/badges/shields?quickstart=1)
+
 1. Install Node 20 or later. You can use the [package manager][] of your choice.
    Tests need to pass in Node 20 and 22.
 2. Clone this repository.