1 files changed, 30 insertions, 0 deletions
diff --git a/src/node-worker.ts b/src/node-worker.ts
new file mode 100644
index 0000000..52f6af0
--- /dev/null
+++ b/src/node-worker.ts
@@ -0,0 +1,30 @@
+// Mediocre shim
+let Worker: typeof import('worker_threads').Worker;
+const workerAdd = ";var __w=require('worker_threads');__w.parentPort.on('message',function(m){onmessage({data:m})}),postMessage=function(m,t){__w.parentPort.postMessage(m,t)},close=process.exit;self=global";
+
+try {
+  Worker = require('worker_threads').Worker;
+} catch(e) {
+}
+export default Worker ? <T>(c: string, _: number, msg: unknown, transfer: ArrayBuffer[], cb: (err: Error, msg: T) => void) => {
+  let done = false;
+  const w = new Worker(c + workerAdd, { eval: true })
+    .on('error', e => cb(e, null))
+    .on('message', m => cb(null, m))
+    .on('exit', c => {
+      if (c && !done) cb(new Error('exited with code ' + c), null);
+    });
+  w.postMessage(msg, transfer);
+  w.terminate = () => {
+    done = true;
+    return Worker.prototype.terminate.call(w);
+  }
+  return w;
+} : (_: string, __: number, ___: unknown, ____: ArrayBuffer[], cb: (err: Error, msg: null) => void) => {
+  setImmediate(() => cb(new Error('async operations unsupported - update to Node 12+ (or Node 10-11 with the --experimental-worker CLI flag)'), null));
+  const NOP = () => {};
+  return {
+    terminate: NOP,
+    postMessage: NOP
+  } as unknown as import('worker_threads').Worker;
+}
+\ No newline at end of file