Move abort propagation logic to separate module

index.js

@@ -3,6 +3,7 @@
 const Promise = require("bluebird");
 const ms = require("ms");
 const promiseDelaySince = require("@joepie91/promise-delay-every");
+const propagateAbort = require("@ppstreams/propagate-abort");
 
 module.exports = function rateLimitedStream(interval) {
 	let intervalInMilliseconds = (typeof interval === "number")
@@ -20,8 +21,6 @@ module.exports = function rateLimitedStream(interval) {
 				return source.read();
 			});
 		},
-		abort: (source, reason) => {
-			source.abort(reason);
-		}
+		abort: propagateAbort
 	}
 };

package.json

@@ -7,6 +7,7 @@
   "license": "WTFPL OR CC0-1.0",
   "dependencies": {
     "@joepie91/promise-delay-every": "^1.0.0",
+    "@ppstreams/propagate-abort": "^0.1.2",
     "bluebird": "^3.5.4",
     "ms": "^2.1.1"
   }