fix(directives): Add explicit type annotations to subscribeWithTemplate directive export

ts/directives/classes.subscribewithtemplate.ts

@@ -1,4 +1,5 @@
 import { type TemplateResult, noChange } from 'lit';
+import type { DirectiveResult } from 'lit/directive.js';
 import { AsyncDirective, directive } from 'lit/async-directive.js';
 import { rxjs } from '@push.rocks/smartrx';
 
@@ -48,4 +49,13 @@ class SubscribeWithTemplateDirective extends AsyncDirective {
  * Directive that renders templates for each emission of an Observable.
  * Usage: html`${subscribeWithTemplate(myObservable, v => html`<span>${v}</span>`)}`
  */
-export const subscribeWithTemplate = directive(SubscribeWithTemplateDirective);
+/**
+ * Typed directive function signature: returns a Lit DirectiveResult.
+ */
+type SubscribeWithTemplateFn = <T>(
+  observable: rxjs.Observable<T>,
+  templateFn: (value: T) => TemplateResult | unknown
+) => DirectiveResult;
+export const subscribeWithTemplate = directive(
+  SubscribeWithTemplateDirective
+) as SubscribeWithTemplateFn;