feat(bind): nested keys accept optional args

Author: josepot

packages/core/src/bind/connectFactoryObservable.ts

@@ -52,7 +52,6 @@ class NestedMap<K extends [], V extends Object> {
   }
 }
 
-const emptyInput = [0]
 /**
  * Accepts: A factory function that returns an Observable.
  *
@@ -87,7 +86,7 @@ export default function connectFactoryObservable<A extends [], O>(
   const getSharedObservables$ = (
     input: A,
   ): [Observable<O>, BehaviorObservable<O>] => {
-    const keys = input.length > 0 ? input : (emptyInput as A)
+    const keys = ([input.length, ...input] as any) as A
     const cachedVal = cache.get(keys)
 
     if (cachedVal !== undefined) {

packages/core/src/bind/index.ts

@@ -47,15 +47,15 @@ export function bind<T>(
  * for the first value.
  */
 export function bind<
-  A extends (number | string | boolean | null | Object | Symbol)[],
+  A extends (number | string | boolean | null | Object | Symbol | undefined)[],
   O
 >(
   getObservable: (...args: A) => Observable<O>,
   unsubscribeGraceTime?: number,
 ): [(...args: A) => Exclude<O, typeof SUSPENSE>, (...args: A) => Observable<O>]
 
 export function bind<
-  A extends (number | string | boolean | null | Object | Symbol)[],
+  A extends (number | string | boolean | null | Object | Symbol | undefined)[],
   O
 >(
   obs: ((...args: A) => Observable<O>) | Observable<O>,