RTL

ts/util/keyboard.ts

@@ -0,0 +1,20 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { LocaleDirection } from '../../app/locale';
+
+export type LogicalDirection = 'start' | 'end';
+export type HorizontalArrowKey = 'ArrowLeft' | 'ArrowRight';
+
+const logicalArrows: Record<
+  LogicalDirection,
+  Record<LocaleDirection, HorizontalArrowKey>
+> = {
+  start: { ltr: 'ArrowLeft', rtl: 'ArrowRight' },
+  end: { ltr: 'ArrowRight', rtl: 'ArrowLeft' },
+};
+
+export function arrow(logicalDirection: LogicalDirection): HorizontalArrowKey {
+  const localeDirection = window.getResolvedMessagesLocaleDirection();
+  return logicalArrows[logicalDirection][localeDirection];
+}