refactor: refine worker interface definition

Signed-off-by: Jérôme Benoit <jerome.benoit@sap.com>

diff --git a/src/pools/worker.ts b/src/pools/worker.ts
index e0636d9920db6ddf4e5d7a20ea412cfbee612b04..be0e3c2734c3eb96b44de652d268da397ef869c1 100644 (file)
--- a/src/pools/worker.ts
+++ b/src/pools/worker.ts
@@ -165,8 +165,8 @@ export interface IWorker {
   /**
    * Worker id.
    */
-  id?: number
-  threadId?: number
+  readonly id?: number
+  readonly threadId?: number
   /**
    * Register an event listener.
    *