Examples: Add NodeJS example

Author: kateinoigakukun

Examples/NodeJS/.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc

Examples/NodeJS/Package.swift

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+// swift-tools-version: 6.2
+
+import PackageDescription
+
+let package = Package(
+    name: "NodeJS",
+    dependencies: [.package(name: "JavaScriptKit", path: "../../")],
+    targets: [
+        .executableTarget(
+            name: "NodeJS",
+            dependencies: ["JavaScriptKit"]
+        )
+    ],
+    swiftLanguageModes: [.v6]
+)

Examples/NodeJS/README.md

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+# NodeJS example
+
+This example demonstrates how to use JavaScriptKit with Node.js. It shows how to export Swift functions to JavaScript and run them in a Node.js environment.
+
+```sh
+$ swift package --swift-sdk $SWIFT_SDK_ID js
+$ node main.mjs
+```
+

Examples/NodeJS/Sources/NodeJS/NodeJS.swift

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+import JavaScriptKit
+
+@main
+struct NodeJS {
+    static func main() {
+        JSObject.global["greet"] =
+            JSClosure { args in
+                let nameString = args[0].string!
+                return .string("Hello, \(nameString) from NodeJS!")
+            }.jsValue
+    }
+}

Examples/NodeJS/main.mjs

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+// @ts-check
+
+import { instantiate } from "./.build/plugins/PackageToJS/outputs/Package/instantiate.js"
+import { defaultNodeSetup } from "./.build/plugins/PackageToJS/outputs/Package/platforms/node.js"
+
+async function main() {
+    // Create a default Node.js option object
+    const options = await defaultNodeSetup();
+    // Instantiate the Swift code, executing
+    // NodeJS.main() in NodeJS.swift
+    await instantiate(options);
+
+    // Call the greet function set by NodeJS.swift
+    const greet = globalThis.greet;
+    console.log(greet("World"));
+}
+
+main()