From e81281c3f2b9f64fbb5329fa8764a5853ee3f6a1 Mon Sep 17 00:00:00 2001
From: Tom Shaw <thomas.shaw@eco-surv.co.uk>
Date: Fri, 22 Oct 2021 21:40:25 +0100
Subject: [PATCH] resolve #2837 added dynamic event bindings

---
 src/runtime/internal/Component.ts | 7 +++++++
 src/runtime/internal/lifecycle.ts | 9 ++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/runtime/internal/Component.ts b/src/runtime/internal/Component.ts
index 3e48010547..c3aabdfbd0 100644
--- a/src/runtime/internal/Component.ts
+++ b/src/runtime/internal/Component.ts
@@ -237,6 +237,13 @@ if (typeof HTMLElement === 'function') {
 export class SvelteComponent {
 	$$: T$$;
 	$$set?: ($$props: any) => void;
+	eventBindings: any;
+
+	constructor(props) {
+		if (props && props.props && Object.prototype.hasOwnProperty.call(props.props, 'event:bindings')) {
+			this.eventBindings = props.props['event:bindings'];
+		}
+	}
 
 	$destroy() {
 		destroy_component(this, 1);
diff --git a/src/runtime/internal/lifecycle.ts b/src/runtime/internal/lifecycle.ts
index bb3df3d295..a26453cd5f 100644
--- a/src/runtime/internal/lifecycle.ts
+++ b/src/runtime/internal/lifecycle.ts
@@ -34,6 +34,7 @@ export function createEventDispatcher<
 
 	return (type: string, detail?: any) => {
 		const callbacks = component.$$.callbacks[type];
+		const eventBinding = component.eventBindings && Object.prototype.hasOwnProperty.call(component.eventBindings, type) ? component.eventBindings[type] : undefined;
 
 		if (callbacks) {
 			// TODO are there situations where events could be dispatched
@@ -43,6 +44,12 @@ export function createEventDispatcher<
 				fn.call(component, event);
 			});
 		}
+
+		if (eventBinding) {
+			// in a server (non-DOM) environment?
+			const event = custom_event(type, detail);
+			eventBinding.call(component, event);
+		}
 	};
 }
 
@@ -59,7 +66,7 @@ export function getAllContexts<T extends Map<any, any> = Map<any, any>>(): T {
 }
 
 export function hasContext(key): boolean {
-	return get_current_component().$$.context.has(key);	
+	return get_current_component().$$.context.has(key);
 }
 
 // TODO figure out if we still want to support