adds a --platform flag to js to control the target platform of the generated code

Author: t089

Plugins/PackageToJS/Sources/PackageToJS.swift

@@ -8,6 +8,8 @@ struct PackageToJS {
         var configuration: String?
         /// Name of the package (default: lowercased Package.swift name)
         var packageName: String?
+        /// Target platform for the generated JavaScript (default: browser)
+        var platform: String?
         /// Whether to explain the build plan (default: false)
         var explain: Bool = false
         /// Whether to print verbose output
@@ -717,6 +719,7 @@ struct PackagingPlanner {
             "USE_WASI_CDN": options.useCDN,
             "HAS_BRIDGE": exportedSkeletons.count > 0 || importedSkeletons.count > 0,
             "HAS_IMPORTS": importedSkeletons.count > 0,
+            "TARGET_PLATFORM_NODE": options.platform == "node",
         ]
         let constantSubstitutions: [String: String] = [
             "PACKAGE_TO_JS_MODULE_PATH": wasmFilename,

Plugins/PackageToJS/Sources/PackageToJSPlugin.swift

@@ -446,6 +446,7 @@ extension PackageToJS.PackageOptions {
         let configuration: String? =
             (extractor.extractOption(named: "configuration") + extractor.extractSingleDashOption(named: "c")).last
         let packageName = extractor.extractOption(named: "package-name").last
+        let platform = extractor.extractOption(named: "platform").last
         let explain = extractor.extractFlag(named: "explain")
         let useCDN = extractor.extractFlag(named: "use-cdn")
         let verbose = extractor.extractFlag(named: "verbose")
@@ -454,6 +455,7 @@ extension PackageToJS.PackageOptions {
             outputPath: outputPath,
             configuration: configuration,
             packageName: packageName,
+            platform: platform,
             explain: explain != 0,
             verbose: verbose != 0,
             useCDN: useCDN != 0,
@@ -466,6 +468,7 @@ extension PackageToJS.PackageOptions {
               --output <path>            Path to the output directory (default: .build/plugins/PackageToJS/outputs/Package)
               -c, --configuration <name> The build configuration to use (values: debug, release; default: debug)
               --package-name <name>      Name of the package (default: lowercased Package.swift name)
+              --platform <name>          Target platform for generated JavaScript (values: browser, node; default: browser)
               --use-cdn                  Whether to use CDN for dependency packages
               --enable-code-coverage     Whether to enable code coverage collection
               --explain                  Whether to explain the build plan

Plugins/PackageToJS/Templates/index.js

@@ -1,9 +1,24 @@
 // @ts-check
 import { instantiate } from './instantiate.js';
+/* #if TARGET_PLATFORM_NODE */
+import { defaultNodeSetup /* #if USE_SHARED_MEMORY */, createDefaultWorkerFactory /* #endif */} from './platforms/node.js';
+/* #else */
 import { defaultBrowserSetup /* #if USE_SHARED_MEMORY */, createDefaultWorkerFactory /* #endif */} from './platforms/browser.js';
+/* #endif */
 
 /** @type {import('./index.d').init} */
 export async function init(_options) {
+/* #if TARGET_PLATFORM_NODE */
+    /** @type {import('./platforms/node.d.ts').DefaultNodeSetupOptions} */
+    const options = _options || {};
+    const instantiateOptions = await defaultNodeSetup({
+        args: options.args,
+        onExit: options.onExit,
+/* #if USE_SHARED_MEMORY */
+        spawnWorker: options.spawnWorker || createDefaultWorkerFactory()
+/* #endif */
+    });
+/* #else */
     /** @type {import('./index.d').Options} */
     const options = _options || {
 /* #if HAS_IMPORTS */
@@ -24,5 +39,6 @@ export async function init(_options) {
         spawnWorker: createDefaultWorkerFactory()
 /* #endif */
     })
+/* #endif */
     return await instantiate(instantiateOptions);
 }