v2

node_modules/concurrently/dist/src/observables.js

@@ -0,0 +1,23 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.fromSharedEvent = fromSharedEvent;
+const rxjs_1 = require("rxjs");
+const sharedEvents = new WeakMap();
+/**
+ * Creates an observable for a specific event of an `EventEmitter` instance.
+ *
+ * The underlying event listener is set up only once across the application for that event emitter/name pair.
+ */
+function fromSharedEvent(emitter, event) {
+    let emitterEvents = sharedEvents.get(emitter);
+    if (!emitterEvents) {
+        emitterEvents = new Map();
+        sharedEvents.set(emitter, emitterEvents);
+    }
+    let observable = emitterEvents.get(event);
+    if (!observable) {
+        observable = (0, rxjs_1.fromEvent)(emitter, event).pipe((0, rxjs_1.share)());
+        emitterEvents.set(event, observable);
+    }
+    return observable;
+}