Updated the files.

my-app/node_modules/rxjs/dist/cjs/internal/observable/fromEvent.js

@@ -0,0 +1,78 @@
+"use strict";
+var __read = (this && this.__read) || function (o, n) {
+    var m = typeof Symbol === "function" && o[Symbol.iterator];
+    if (!m) return o;
+    var i = m.call(o), r, ar = [], e;
+    try {
+        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
+    }
+    catch (error) { e = { error: error }; }
+    finally {
+        try {
+            if (r && !r.done && (m = i["return"])) m.call(i);
+        }
+        finally { if (e) throw e.error; }
+    }
+    return ar;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.fromEvent = void 0;
+var innerFrom_1 = require("../observable/innerFrom");
+var Observable_1 = require("../Observable");
+var mergeMap_1 = require("../operators/mergeMap");
+var isArrayLike_1 = require("../util/isArrayLike");
+var isFunction_1 = require("../util/isFunction");
+var mapOneOrManyArgs_1 = require("../util/mapOneOrManyArgs");
+var nodeEventEmitterMethods = ['addListener', 'removeListener'];
+var eventTargetMethods = ['addEventListener', 'removeEventListener'];
+var jqueryMethods = ['on', 'off'];
+function fromEvent(target, eventName, options, resultSelector) {
+    if (isFunction_1.isFunction(options)) {
+        resultSelector = options;
+        options = undefined;
+    }
+    if (resultSelector) {
+        return fromEvent(target, eventName, options).pipe(mapOneOrManyArgs_1.mapOneOrManyArgs(resultSelector));
+    }
+    var _a = __read(isEventTarget(target)
+        ? eventTargetMethods.map(function (methodName) { return function (handler) { return target[methodName](eventName, handler, options); }; })
+        :
+            isNodeStyleEventEmitter(target)
+                ? nodeEventEmitterMethods.map(toCommonHandlerRegistry(target, eventName))
+                : isJQueryStyleEventEmitter(target)
+                    ? jqueryMethods.map(toCommonHandlerRegistry(target, eventName))
+                    : [], 2), add = _a[0], remove = _a[1];
+    if (!add) {
+        if (isArrayLike_1.isArrayLike(target)) {
+            return mergeMap_1.mergeMap(function (subTarget) { return fromEvent(subTarget, eventName, options); })(innerFrom_1.innerFrom(target));
+        }
+    }
+    if (!add) {
+        throw new TypeError('Invalid event target');
+    }
+    return new Observable_1.Observable(function (subscriber) {
+        var handler = function () {
+            var args = [];
+            for (var _i = 0; _i < arguments.length; _i++) {
+                args[_i] = arguments[_i];
+            }
+            return subscriber.next(1 < args.length ? args : args[0]);
+        };
+        add(handler);
+        return function () { return remove(handler); };
+    });
+}
+exports.fromEvent = fromEvent;
+function toCommonHandlerRegistry(target, eventName) {
+    return function (methodName) { return function (handler) { return target[methodName](eventName, handler); }; };
+}
+function isNodeStyleEventEmitter(target) {
+    return isFunction_1.isFunction(target.addListener) && isFunction_1.isFunction(target.removeListener);
+}
+function isJQueryStyleEventEmitter(target) {
+    return isFunction_1.isFunction(target.on) && isFunction_1.isFunction(target.off);
+}
+function isEventTarget(target) {
+    return isFunction_1.isFunction(target.addEventListener) && isFunction_1.isFunction(target.removeEventListener);
+}
+//# sourceMappingURL=fromEvent.js.map