Update exports, add `Renderable` type

`Renderable` type is useful for 3rd-party code which wants to accept
any `swel`-renderable type

mod.ts

@@ -4,15 +4,15 @@ type BasicProperties<T> = {
 	[K in keyof T as T[K] extends string | number | boolean ? K : never]: T[K];
 };
 
-type Child = Node | string | null;
-type SwelOpts<T extends keyof HTMLElementTagNameMap> = Partial<
+export type Child = Node | string | null;
+export type SwelOpts<T extends keyof HTMLElementTagNameMap> = Partial<
 	BasicProperties<HTMLElementTagNameMap[T]>
 > & {
 	on: Partial<{
 		[Ev in keyof HTMLElementEventMap]: (
 			this: HTMLElement,
 			ev: HTMLElementEventMap[Ev],
-		) => any;
+		) => void;
 	}>;
 	children: (Node | string)[] | null;
 	attributes: Record<string, string | boolean | number>;
@@ -20,6 +20,8 @@ type SwelOpts<T extends keyof HTMLElementTagNameMap> = Partial<
 	style: Record<string, string | boolean | number> | null;
 };
 
+export type Renderable = Child | Child[];
+
 interface Swel {
 	<T extends keyof HTMLElementTagNameMap>(
 		tag: T,
@@ -47,12 +49,23 @@ interface Swel {
 		opts?: Partial<Omit<SwelOpts<T>, "children">>,
 		child?: Child,
 	): HTMLElementTagNameMap[T];
+
+	<T extends keyof HTMLElementTagNameMap>(
+		tag: T,
+		opts?: Partial<Omit<SwelOpts<T>, "children">>,
+		renderable?: Renderable,
+	): HTMLElementTagNameMap[T];
+
+	<T extends keyof HTMLElementTagNameMap>(
+		tag: T,
+		renderable?: Renderable,
+	): HTMLElementTagNameMap[T];
 }
 
 export const swel: Swel = <T extends keyof HTMLElementTagNameMap>(
 	tag: T,
-	opts?: Partial<SwelOpts<T>> | Child | Child[],
-	children?: Child | Child[],
+	opts?: Partial<SwelOpts<T>> | Renderable,
+	children?: Renderable,
 ): HTMLElementTagNameMap[T] => {
 	let o: Partial<SwelOpts<T>> | null = null;
 	if (children) {