planning

node_modules/apollo-client/util/observables.js

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+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var Observable_1 = require("./Observable");
+function multiplex(inner) {
+    var observers = new Set();
+    var sub = null;
+    return new Observable_1.Observable(function (observer) {
+        observers.add(observer);
+        sub = sub || inner.subscribe({
+            next: function (value) {
+                observers.forEach(function (obs) { return obs.next && obs.next(value); });
+            },
+            error: function (error) {
+                observers.forEach(function (obs) { return obs.error && obs.error(error); });
+            },
+            complete: function () {
+                observers.forEach(function (obs) { return obs.complete && obs.complete(); });
+            },
+        });
+        return function () {
+            if (observers.delete(observer) && !observers.size && sub) {
+                sub.unsubscribe();
+                sub = null;
+            }
+        };
+    });
+}
+exports.multiplex = multiplex;
+function asyncMap(observable, mapFn) {
+    return new Observable_1.Observable(function (observer) {
+        var next = observer.next, error = observer.error, complete = observer.complete;
+        var activeNextCount = 0;
+        var completed = false;
+        var handler = {
+            next: function (value) {
+                ++activeNextCount;
+                new Promise(function (resolve) {
+                    resolve(mapFn(value));
+                }).then(function (result) {
+                    --activeNextCount;
+                    next && next.call(observer, result);
+                    completed && handler.complete();
+                }, function (e) {
+                    --activeNextCount;
+                    error && error.call(observer, e);
+                });
+            },
+            error: function (e) {
+                error && error.call(observer, e);
+            },
+            complete: function () {
+                completed = true;
+                if (!activeNextCount) {
+                    complete && complete.call(observer);
+                }
+            },
+        };
+        var sub = observable.subscribe(handler);
+        return function () { return sub.unsubscribe(); };
+    });
+}
+exports.asyncMap = asyncMap;
+//# sourceMappingURL=observables.js.map