fix: ArrayBuffer is already detached (ipfs#3480)

packages/ipfs-message-port-server/src/server.js

@@ -212,11 +212,25 @@ exports.Server = class Server {
     if (!query.signal.aborted) {
       try {
         const value = await query.result
-        const transfer = [...new Set(value.transfer || [])]
+
+        // Only keep buffers that aren't detached
+        const transferValue = (value.transfer || []).map(t => {
+          if (t instanceof ArrayBuffer || ArrayBuffer.isView(t)) {
+            return t.byteLength === 0 ? t.slice(0) : t
+          } else {
+            return t
+          }
+        })
+
+        // Make a Set of the transfer values, so we're definitely working with unique values
+        const transfer = new Set(transferValue)
+
+        // Don't need the transfer value in the result
         delete value.transfer
 
         port.postMessage(
           { type: 'result', id, result: { ok: true, value } },
+          // @ts-ignore - Typescript expects the transfer list to be an Array, but it can actually be any iterable.
           transfer
         )
       } catch (error) {