Merge pull request #35 from GoogleChromeLabs/node-workers

Add support for node worker threads

Author: surma

README.md

@@ -6,7 +6,7 @@ A small library to detect which features of WebAssembly are supported.
 - ✅ Runs in Node
 - ✅ Provided as an ES6 module, CommonJS and UMD module.
 - ✅ CSP compatible
-- ✅ Only ~520B gzipped
+- ✅ Only ~570B gzipped
 
 ## Installation
 

rollup.config.js

@@ -26,6 +26,7 @@ export default ["esm", "cjs", "umd"].map(format => ({
     preferConst: true,
     esModule: false
   },
+  external: ["worker_threads"],
   plugins: [
     indexGenerator({
       indexPath: "./src/index.js",

src/detectors/threads/index.js

@@ -13,9 +13,13 @@
 
 export default async moduleBytes => {
   try {
+    const MessageChannelConstructor =
+      typeof MessageChannel !== "undefined"
+        ? MessageChannel
+        : await import("worker_threads").then(m => m.MessageChannel);
     // Test for transferability of SABs (needed for Firefox)
     // https://groups.google.com/forum/#!msg/mozilla.dev.platform/IHkBZlHETpA/dwsMNchWEQAJ
-    new MessageChannel().port1.postMessage(new SharedArrayBuffer(1));
+    new MessageChannelConstructor().port1.postMessage(new SharedArrayBuffer(1));
     return WebAssembly.validate(moduleBytes);
   } catch (e) {
     return false;