feat(typescript): updated to typescript 2.4.0 (rc) (#2684)

Fixed code that was failing due to compiler upgrade

Several methods are now using default generic arguments, which were introduced in ts2.3

package.json

@@ -138,6 +138,10 @@
     {
       "name": "Andre Staltz",
       "email": "andre@staltz.com"
+    },
+    {
+      "name": "David Driscoll",
+      "email": "david.driscoll@gmail.com"
     }
   ],
   "license": "Apache-2.0",
@@ -172,32 +176,32 @@
     "gzip-size": "^3.0.0",
     "http-server": "^0.9.0",
     "husky": "^0.13.3",
-    "lint-staged": "3.2.5",
-    "lodash": "^4.15.0",
+    "lint-staged": "^4.0.0",
+    "lodash": "^4.17.4",
     "madge": "^1.4.3",
     "markdown-doctest": "^0.9.1",
     "minimist": "^1.2.0",
     "mkdirp": "^0.5.1",
-    "mocha": "^3.0.2",
+    "mocha": "^3.4.2",
     "mocha-in-sauce": "0.0.1",
     "npm-run-all": "^4.0.2",
     "npm-scripts-info": "^0.3.4",
-    "nyc": "^10.2.0",
+    "nyc": "^11.0.2",
     "opn-cli": "^3.1.0",
     "platform": "^1.3.1",
     "promise": "^7.1.1",
-    "protractor": "^3.1.1",
+    "protractor": "^5.1.2",
     "rollup": "0.36.3",
     "rollup-plugin-inject": "^2.0.0",
     "rollup-plugin-node-resolve": "^2.0.0",
     "rx": "latest",
     "shx": "^0.2.2",
-    "sinon": "^2.1.0",
-    "sinon-chai": "^2.9.0",
+    "sinon": "^2.3.5",
+    "sinon-chai": "^2.11.0",
     "source-map-support": "^0.4.0",
     "tslib": "^1.7.1",
     "tslint": "^5.4.3",
-    "typescript": "~2.3.0",
+    "typescript": "^2.4.0",
     "validate-commit-msg": "^2.3.1",
     "watch": "^1.0.1",
     "webpack": "^1.13.1",

spec/observables/dom/ajax-spec.ts

@@ -950,7 +950,7 @@ class MockXMLHttpRequest {
 
   private previousRequest: MockXMLHttpRequest;
 
-  protected responseType: string = '';
+  protected responseType: XMLHttpRequestResponseType = '';
   private eventHandlers: Array<any> = [];
   private readyState: number = 0;
 

src/Observable.ts

@@ -64,7 +64,7 @@ export class Observable<T> implements Subscribable<T> {
    * @param {Operator} operator the operator defining the operation to take on the observable
    * @return {Observable} a new observable with the Operator applied
    */
-  lift<R>(operator: Operator<T, R>): Observable<R> {
+  lift<R = T>(operator: Operator<T, R>): Observable<R> {
     const observable = new Observable<R>();
     observable.source = this;
     observable.operator = operator;

src/operator/catch.ts

@@ -14,10 +14,10 @@ import { subscribeToResult } from '../util/subscribeToResult';
  *
  * Observable.of(1, 2, 3, 4, 5)
  *   .map(n => {
- * 	   if (n == 4) {
- * 	     throw 'four!';
+ *        if (n == 4) {
+ *          throw 'four!';
  *     }
- *	   return n;
+ *       return n;
  *   })
  *   .catch(err => Observable.of('I', 'II', 'III', 'IV', 'V'))
  *   .subscribe(x => console.log(x));
@@ -27,10 +27,10 @@ import { subscribeToResult } from '../util/subscribeToResult';
  *
  * Observable.of(1, 2, 3, 4, 5)
  *   .map(n => {
- * 	   if (n === 4) {
- * 	     throw 'four!';
+ *        if (n === 4) {
+ *          throw 'four!';
  *     }
- * 	   return n;
+ *        return n;
  *   })
  *   .catch((err, caught) => caught)
  *   .take(30)
@@ -64,16 +64,16 @@ import { subscribeToResult } from '../util/subscribeToResult';
  * @name catch
  * @owner Observable
  */
-export function _catch<T, R>(this: Observable<T>, selector: (err: any, caught: Observable<T>) => ObservableInput<R>): Observable<T | R> {
+export function _catch<T, R = T>(this: Observable<T>, selector: (err: any, caught: Observable<R>) => ObservableInput<R>): Observable<R> {
   const operator = new CatchOperator(selector);
   const caught = this.lift(operator);
   return (operator.caught = caught);
 }
 
-class CatchOperator<T, R> implements Operator<T, T | R> {
-  caught: Observable<T>;
+class CatchOperator<T, R = T> implements Operator<T, R> {
+  caught: Observable<R>;
 
-  constructor(private selector: (err: any, caught: Observable<T>) => ObservableInput<T | R>) {
+  constructor(private selector: (err: any, caught: Observable<R>) => ObservableInput<R>) {
   }
 
   call(subscriber: Subscriber<R>, source: any): any {
@@ -86,10 +86,10 @@ class CatchOperator<T, R> implements Operator<T, T | R> {
  * @ignore
  * @extends {Ignored}
  */
-class CatchSubscriber<T, R> extends OuterSubscriber<T, T | R> {
+class CatchSubscriber<T, R> extends OuterSubscriber<T, R> {
   constructor(destination: Subscriber<any>,
-              private selector: (err: any, caught: Observable<T>) => ObservableInput<T | R>,
-              private caught: Observable<T>) {
+              private selector: (err: any, caught: Observable<R>) => ObservableInput<R>,
+              private caught: Observable<R>) {
     super(destination);
   }
 

src/operator/defaultIfEmpty.ts

@@ -3,8 +3,7 @@ import { Observable } from '../Observable';
 import { Subscriber } from '../Subscriber';
 
 /* tslint:disable:max-line-length */
-export function defaultIfEmpty<T>(this: Observable<T>, defaultValue?: T): Observable<T>;
-export function defaultIfEmpty<T, R>(this: Observable<T>, defaultValue?: R): Observable<T | R>;
+export function defaultIfEmpty<T, R = T>(this: Observable<T>, defaultValue?: R): Observable<R>;
 /* tslint:enable:max-line-length */
 
 /**
@@ -37,16 +36,16 @@ export function defaultIfEmpty<T, R>(this: Observable<T>, defaultValue?: R): Obs
  * @method defaultIfEmpty
  * @owner Observable
  */
-export function defaultIfEmpty<T, R>(this: Observable<T>, defaultValue: R = null): Observable<T | R> {
+export function defaultIfEmpty<T, R = T>(this: Observable<T>, defaultValue: R = null): Observable<R> {
   return this.lift(new DefaultIfEmptyOperator(defaultValue));
 }
 
-class DefaultIfEmptyOperator<T, R> implements Operator<T, T | R> {
+class DefaultIfEmptyOperator<T, R> implements Operator<T, R> {
 
   constructor(private defaultValue: R) {
   }
 
-  call(subscriber: Subscriber<T | R>, source: any): any {
+  call(subscriber: Subscriber<R>, source: any): any {
     return source.subscribe(new DefaultIfEmptySubscriber(subscriber, this.defaultValue));
   }
 }
@@ -59,7 +58,7 @@ class DefaultIfEmptyOperator<T, R> implements Operator<T, T | R> {
 class DefaultIfEmptySubscriber<T, R> extends Subscriber<T> {
   private isEmpty: boolean = true;
 
-  constructor(destination: Subscriber<T | R>, private defaultValue: R) {
+  constructor(destination: Subscriber<R>, private defaultValue: R) {
     super(destination);
   }
 

src/util/isPromise.ts

@@ -1,3 +1,3 @@
-export function isPromise<T>(value: any | Promise<T>): value is Promise<T> {
+export function isPromise<T>(value: any | PromiseLike<T>): value is PromiseLike<T> {
   return value && typeof (<any>value).subscribe !== 'function' && typeof (value as any).then === 'function';
 }