From 608a9ad347320365b4838e27413b4ca04afe9785 Mon Sep 17 00:00:00 2001
From: Paul Bottein <paul.bottein@gmail.com>
Date: Thu, 28 Jan 2021 21:07:17 +0100
Subject: [PATCH] use type guard

---
 front/src/WebRtc/HtmlUtils.ts | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/front/src/WebRtc/HtmlUtils.ts b/front/src/WebRtc/HtmlUtils.ts
index 48c1e092..9b4d9bb8 100644
--- a/front/src/WebRtc/HtmlUtils.ts
+++ b/front/src/WebRtc/HtmlUtils.ts
@@ -8,12 +8,11 @@ export class HtmlUtils {
     }
 
     public static querySelectorOrFail<T extends HTMLElement>(selector: string): T {
-        const elem = document.querySelector(selector);
-        if (elem === null) {
-            throw new Error("Cannot find HTML element with selector '"+selector+"'");
+        const elem = document.querySelector<T>(selector);
+        if (HtmlUtils.isHtmlElement<T>(elem)) {
+            return elem;
         }
-        // FIXME: does not check the type of the returned type
-        return elem as T;
+        throw new Error("Cannot find HTML element with selector '"+selector+"'");
     }
 
     public static removeElementByIdOrFail<T extends HTMLElement>(id: string): T {