From 71cbfeded447b7d6b7da29d03a701dc26660d070 Mon Sep 17 00:00:00 2001
From: Jakub Vrana <jakubvrana@google.com>
Date: Wed, 9 Jan 2019 14:46:52 +0100
Subject: [PATCH] trusted-types: Prevent structural typing

---
 types/trusted-types/index.d.ts | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/types/trusted-types/index.d.ts b/types/trusted-types/index.d.ts
index 64ed96b713..2d2db62999 100644
--- a/types/trusted-types/index.d.ts
+++ b/types/trusted-types/index.d.ts
@@ -3,10 +3,21 @@
 // Definitions by: Jakub Vrana <https://github.com/vrana>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-declare class TrustedHTML {}
-declare class TrustedScript {}
-declare class TrustedScriptURL {}
-declare class TrustedURL {}
+declare class TrustedHTML {
+	private readonly _TrustedHTMLBrand: true; // To prevent structural typing.
+}
+
+declare class TrustedScript {
+	private readonly _TrustedScriptBrand: true; // To prevent structural typing.
+}
+
+declare class TrustedScriptURL {
+	private readonly _TrustedScriptURLBrand: true; // To prevent structural typing.
+}
+
+declare class TrustedURL {
+	private readonly _TrustedURL: trueBrand; // To prevent structural typing.
+}
 
 declare class TrustedTypePolicy {
 	createHTML(s: string): TrustedHTML;