From cefd1e4251f3603c4c90ca4dcfaca9d8552001e9 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Wed, 25 Sep 2019 09:34:24 -0700
Subject: [PATCH] Add regression test

---
 .../controlFlow/neverReturningFunctions1.ts   | 69 +++++++++++++++++++
 1 file changed, 69 insertions(+)

diff --git a/tests/cases/conformance/controlFlow/neverReturningFunctions1.ts b/tests/cases/conformance/controlFlow/neverReturningFunctions1.ts
index 63e7ecf786f..72dd0a13b5a 100644
--- a/tests/cases/conformance/controlFlow/neverReturningFunctions1.ts
+++ b/tests/cases/conformance/controlFlow/neverReturningFunctions1.ts
@@ -156,3 +156,72 @@ function f42(x: number) {
     }
     x;  // Unreachable
 }
+
+// Repro from #33582
+
+export interface Component<T extends object = any> {
+	attrName?: string;
+	data: T;
+	dependencies?: string[];
+	el: any;
+	id: string;
+	multiple?: boolean;
+	name: string;
+	schema: unknown;
+	system: any;
+
+	init(data?: T): void;
+	pause(): void;
+	play(): void;
+	remove(): void;
+	tick?(time: number, timeDelta: number): void;
+	update(oldData: T): void;
+	updateSchema?(): void;
+
+	extendSchema(update: unknown): void;
+	flushToDOM(): void;
+}
+
+export interface ComponentConstructor<T extends object> {
+	new (el: unknown, attrValue: string, id: string): T & Component;
+	prototype: T & {
+		name: string;
+		system: unknown;
+		play(): void;
+		pause(): void;
+	};
+}
+
+declare function registerComponent<T extends object>(
+    name: string,
+    component: ComponentDefinition<T>
+): ComponentConstructor<T>;
+
+export type ComponentDefinition<T extends object = object> = T & Partial<Component> & ThisType<T & Component>;
+
+const Component = registerComponent('test-component', {
+	schema: {
+		myProperty: {
+			default: [],
+			parse() {
+				return [true];
+			}
+		},
+		string: { type: 'string' },
+		num: 0
+	},
+	init() {
+		this.data.num = 0;
+		this.el.setAttribute('custom-attribute', 'custom-value');
+	},
+	update() {},
+	tick() {},
+	remove() {},
+	pause() {},
+	play() {},
+
+	multiply(f: number) {
+		// Reference to system because both were registered with the same name.
+		return f * this.data.num * this.system!.data.counter;
+	}
+});