1 files changed, 61 insertions, 0 deletions
diff --git a/packages/frontend/src/timelines.ts b/packages/frontend/src/timelines.ts
new file mode 100644
index 0000000000..5080ef4b96
--- /dev/null
+++ b/packages/frontend/src/timelines.ts
@@ -0,0 +1,61 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { $i } from '@/account.js';
+import { instance } from '@/instance.js';
+
+export const basicTimelineTypes = [
+	'home',
+	'local',
+	'social',
+	'bubble',
+	'global',
+] as const;
+
+export type BasicTimelineType = typeof basicTimelineTypes[number];
+
+export function isBasicTimeline(timeline: string): timeline is BasicTimelineType {
+	return basicTimelineTypes.includes(timeline as BasicTimelineType);
+}
+
+export function basicTimelineIconClass(timeline: BasicTimelineType): string {
+	switch (timeline) {
+		case 'home':
+			return 'ti ti-home';
+		case 'local':
+			return 'ti ti-planet';
+		case 'social':
+			return 'ti ti-universe';
+		case 'bubble':
+			return 'ph-drop ph-bold ph-lg';
+		case 'global':
+			return 'ti ti-whirl';
+	}
+}
+
+export function isAvailableBasicTimeline(timeline: BasicTimelineType | undefined | null): boolean {
+	switch (timeline) {
+		case 'home':
+			return $i != null;
+		case 'local':
+			return ($i == null && instance.policies.ltlAvailable) || ($i != null && $i.policies.ltlAvailable);
+		case 'social':
+			return $i != null && $i.policies.ltlAvailable;
+		case 'bubble':
+			return ($i == null && instance.policies.btlAvailable) || ($i != null && $i.policies.btlAvailable);
+		case 'global':
+			return ($i == null && instance.policies.gtlAvailable) || ($i != null && $i.policies.gtlAvailable);
+		default:
+			return false;
+	}
+}
+
+export function availableBasicTimelines(): BasicTimelineType[] {
+	return basicTimelineTypes.filter(isAvailableBasicTimeline);
+}
+
+export function hasWithReplies(timeline: BasicTimelineType | undefined | null): boolean {
+	return timeline === 'local' || timeline === 'social';
+}