From 7303f2fdc7d3457ce957e5901992f452b84877e4 Mon Sep 17 00:00:00 2001
From: Ivan Hofer <ivan.hofer@outlook.com>
Date: Mon, 7 Mar 2022 18:41:12 +0100
Subject: [PATCH] add `Action` type

---
 src/runtime/index.ts        |  1 +
 src/runtime/internal/dom.ts | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/src/runtime/index.ts b/src/runtime/index.ts
index 8e12f9f0ee..fa45e190af 100644
--- a/src/runtime/index.ts
+++ b/src/runtime/index.ts
@@ -11,6 +11,7 @@ export {
 	hasContext,
 	tick,
 	createEventDispatcher,
+	Action,
 	SvelteComponentDev as SvelteComponent,
 	SvelteComponentTyped
 } from 'svelte/internal';
diff --git a/src/runtime/internal/dom.ts b/src/runtime/internal/dom.ts
index 287c16b5fc..641d6ae35d 100644
--- a/src/runtime/internal/dom.ts
+++ b/src/runtime/internal/dom.ts
@@ -732,3 +732,20 @@ export function get_custom_elements_slots(element: HTMLElement) {
 	});
 	return result;
 }
+
+
+type ActionWithParams<Node extends HTMLElement = HTMLElement, Params extends any = any> = (
+	node: Node,
+	options: Params
+) => {
+	update?: (params: Params) => void
+	destroy?: () => void
+}
+
+type ActionWithoutParams<Node extends HTMLElement = HTMLElement> = (node: Node) => {
+	destroy?: () => void
+}
+
+export type Action<Node extends HTMLElement = HTMLElement, Params extends any = void> = void extends Params
+	? ActionWithoutParams<Node>
+	: ActionWithParams<Node, Params>