From 8a8005effaeb7be649541715f3172322061a8dcd Mon Sep 17 00:00:00 2001
From: dapplion <guillem.lion.benosa@gmail.com>
Date: Thu, 10 Dec 2020 11:16:55 +0000
Subject: [PATCH] Worker thread error demo

---
 .github/workflows/ci.yml           | 2 ++
 bindings/node.js/runnable.js       | 2 +-
 bindings/node.js/worker-threads.js | 8 ++++++++
 3 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 bindings/node.js/worker-threads.js

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 522d400c..39de5717 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -126,3 +126,5 @@ jobs:
               )
             fi
         fi
+    - name: Worker threads error
+      run: node bindings/node.js/worker-threads.js
diff --git a/bindings/node.js/runnable.js b/bindings/node.js/runnable.js
index 002ce8dc..138ad739 100644
--- a/bindings/node.js/runnable.js
+++ b/bindings/node.js/runnable.js
@@ -2,7 +2,7 @@
 
 console.log("testing...");
 
-const blst = require("blst");
+const blst = require("./blst.node");
 
 var msg = "assertion";          // this what we're signing
 var DST = "MY-DST";             // domain separation tag
diff --git a/bindings/node.js/worker-threads.js b/bindings/node.js/worker-threads.js
new file mode 100644
index 00000000..b0e50839
--- /dev/null
+++ b/bindings/node.js/worker-threads.js
@@ -0,0 +1,8 @@
+const { Worker } = require("worker_threads");
+
+// Create two workers so blst.node is imported twice to trigger the error
+// blst/bindings/node.js$ node worker-threads.js
+// Error: Module did not self-register: 'blst/bindings/node.js/blst.node'.
+
+const worker1 = new Worker("./runnable.js");
+const worker2 = new Worker("./runnable.js");