From 4016d67c40b2f7f92a47be2af1a68f4c4a6a2972 Mon Sep 17 00:00:00 2001
From: "shigeru.nakajima" <shigeru.nakajima@gmail.com>
Date: Tue, 5 May 2026 14:29:08 +0900
Subject: [PATCH] Add Ruby::Box example

---
 .../ruby-wasm-wasi/example/README.md          |  1 +
 .../ruby-wasm-wasi/example/ruby-box.node.js   | 28 +++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 packages/npm-packages/ruby-wasm-wasi/example/ruby-box.node.js

diff --git a/packages/npm-packages/ruby-wasm-wasi/example/README.md b/packages/npm-packages/ruby-wasm-wasi/example/README.md
index d181d6543..4d95d5eb7 100644
--- a/packages/npm-packages/ruby-wasm-wasi/example/README.md
+++ b/packages/npm-packages/ruby-wasm-wasi/example/README.md
@@ -16,4 +16,5 @@ $ # Open http://localhost:8000/script-src
 ```console
 $ npm install
 $ node --experimental-wasi-unstable-preview1 index.node.js
+$ node ruby-box.node.js
 ```
diff --git a/packages/npm-packages/ruby-wasm-wasi/example/ruby-box.node.js b/packages/npm-packages/ruby-wasm-wasi/example/ruby-box.node.js
new file mode 100644
index 000000000..4468780c8
--- /dev/null
+++ b/packages/npm-packages/ruby-wasm-wasi/example/ruby-box.node.js
@@ -0,0 +1,28 @@
+import fs from "fs/promises";
+import { DefaultRubyVM } from "@ruby/wasm-wasi/dist/node";
+
+// $ node ruby-box.node.js
+
+const main = async () => {
+  const binary = await fs.readFile(
+    "./node_modules/@ruby/head-wasm-wasi/dist/ruby.wasm",
+  );
+  const module = await WebAssembly.compile(binary);
+  const { vm } = await DefaultRubyVM(module, {
+    env: {
+      RUBY_BOX: "1",
+    },
+  });
+
+  vm.eval(`
+    box = Ruby::Box.new
+    box.eval <<~RUBY
+      X = 123
+    RUBY
+
+    puts "Ruby::Box.enabled?: #{Ruby::Box.enabled?}"
+    puts "box::X: #{box::X}"
+  `);
+};
+
+main();