Make sure timeout does not fire twice.

Author: coreybutler

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@ngnjs/queue",
-  "version": "1.0.0-alpha.4",
-  "description": "A lightweight NGN queue/taskrunner.",
+  "version": "1.0.0-alpha.5",
+  "description": "A lightweight NGN queue (taskrunner).",
   "type": "module",
   "main": "src/index.js",
   "module": "index.js",

src/runner.js

@@ -297,9 +297,11 @@ export default class Queue extends EventEmitter {
   }
 
   abort (timeout = false, task) {
-    this.#cancelled = true
-    clearTimeout(this.#timer)
-    this._status = timeout ? 'timeout' : 'aborting'
-    this.emit(timeout ? 'timeout' : 'aborted', task)
+    if (!this.#cancelled) {
+      this.#cancelled = true
+      clearTimeout(this.#timer)
+      this._status = timeout ? 'timeout' : 'aborting'
+      this.emit(timeout ? 'timeout' : 'aborted', task)
+    }
   }
 }