1 files changed, 46 insertions, 0 deletions
diff --git a/packages/frontend-shared/js/use-interval.ts b/packages/frontend-shared/js/use-interval.ts
new file mode 100644
index 0000000000..b50e78c3cc
--- /dev/null
+++ b/packages/frontend-shared/js/use-interval.ts
@@ -0,0 +1,46 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { onActivated, onDeactivated, onMounted, onUnmounted } from 'vue';
+
+export function useInterval(fn: () => void, interval: number, options: {
+	immediate: boolean;
+	afterMounted: boolean;
+}): (() => void) | undefined {
+	if (Number.isNaN(interval)) return;
+
+	let intervalId: number | null = null;
+
+	if (options.afterMounted) {
+		onMounted(() => {
+			if (options.immediate) fn();
+			intervalId = window.setInterval(fn, interval);
+		});
+	} else {
+		if (options.immediate) fn();
+		intervalId = window.setInterval(fn, interval);
+	}
+
+	const clear = () => {
+		if (intervalId) window.clearInterval(intervalId);
+		intervalId = null;
+	};
+
+	onActivated(() => {
+		if (intervalId) return;
+		if (options.immediate) fn();
+		intervalId = window.setInterval(fn, interval);
+	});
+
+	onDeactivated(() => {
+		clear();
+	});
+
+	onUnmounted(() => {
+		clear();
+	});
+
+	return clear;
+}