From a87dd5ddec2e9e6b53e8eb9883277ec582f1bc0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Acid=20Chicken=20=28=E7=A1=AB=E9=85=B8=E9=B6=8F=29?=
 <root@acid-chicken.com>
Date: Fri, 21 Jul 2023 10:53:37 +0000
Subject: [PATCH] fix: response to experimental rIC support on Safari removed
 due to Google Login bug?

---
 packages/frontend/src/scripts/idle-render.ts | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/packages/frontend/src/scripts/idle-render.ts b/packages/frontend/src/scripts/idle-render.ts
index ccce8b02b..781b624cd 100644
--- a/packages/frontend/src/scripts/idle-render.ts
+++ b/packages/frontend/src/scripts/idle-render.ts
@@ -1,3 +1,20 @@
+const requestIdleCallback: typeof globalThis.requestIdleCallback = globalThis.requestIdleCallback ?? (callback) => {
+	const start = performance.now();
+	const timeoutId = setTimeout(() => {
+		callback({
+			didTimeout: false, // polyfill でタイムアウト発火することはない
+			timeRemaining() {
+				const diff = performance.now() - start;
+				return Math.max(0, 50 - diff); // <https://www.w3.org/TR/requestidlecallback/#idle-periods>
+			},
+		});
+	});
+	return timeoutId;
+};
+const cancelIdleCallback: typeof globalThis.cancelIdleCallback = globalThis.cancelIdleCallback ?? (timeoutId) => {
+	clearTimeout(timeoutId);
+};
+
 class IdlingRenderScheduler {
 	#renderers: Set<FrameRequestCallback>;
 	#rafId: number;