From b8cb3a98d87d1db278b700ec35669f31e42bc258 Mon Sep 17 00:00:00 2001
From: Ben Lesh <ben@benlesh.com>
Date: Tue, 27 Aug 2019 19:06:12 -0500
Subject: [PATCH] fixup! feat(of): Update of typings

---
 src/internal/observable/of.ts |  4 ++--
 src/internal/types.ts         | 18 +++++++++++++++++-
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/src/internal/observable/of.ts b/src/internal/observable/of.ts
index 10b1270a3b..ee76acd39f 100644
--- a/src/internal/observable/of.ts
+++ b/src/internal/observable/of.ts
@@ -1,4 +1,4 @@
-import { SchedulerLike, ArrayValueOf } from '../types';
+import { SchedulerLike, ValueFromArray } from '../types';
 import { isScheduler } from '../util/isScheduler';
 import { fromArray } from './fromArray';
 import { Observable } from '../Observable';
@@ -36,7 +36,7 @@ export function of(): Observable<never>;
 export function of<T>(): Observable<T>;
 /** @deprecated remove in v8. Do not use generic arguments directly, allow inference or cast with `as` */
 export function of<T>(value: T): Observable<T>;
-export function of<A extends Array<any>>(...args: A): Observable<ArrayValueOf<A>>;
+export function of<A extends Array<any>>(...args: A): Observable<ValueFromArray<A>>;
 /* tslint:enable:max-line-length */
 
 /**
diff --git a/src/internal/types.ts b/src/internal/types.ts
index 141cd691ca..a014cc1634 100644
--- a/src/internal/types.ts
+++ b/src/internal/types.ts
@@ -98,8 +98,24 @@ export interface SchedulerAction<T> extends Subscription {
   schedule(state?: T, delay?: number): Subscription;
 }
 
+/**
+ * Extracts the type from an `ObservableInput<any>`. If you have
+ * `O extends ObservableInput<any>` and you pass in `Observable<number>`, or
+ * `Promise<number>`, etc, it will type as `number`.
+ */
 export type ObservedValueOf<O> = O extends ObservableInput<infer T> ? T : never;
 
+/**
+ * Extracts the generic type from an `ObservableInput<any>[]`.
+ * If you have `O extends ObservableInput<any>[]` and you pass in
+ * `Observable<string>[]` or `Promise<string>[]` you would get
+ * back a type of `string`
+ */
 export type ObservedValuesFromArray<X> = X extends Array<ObservableInput<infer T>> ? T : never;
 
-export type ArrayValueOf<A> = A extends Array<infer T> ? T : never;
\ No newline at end of file
+/**
+ * Extracts the generic value from an Array type.
+ * If you have `T extends Array<any>`, and pass a `string[]` to it,
+ * `ValueFromArray<T>` will return the actual type of `string`.
+ */
+export type ValueFromArray<A> = A extends Array<infer T> ? T : never;
\ No newline at end of file