element-web/src/RoomAliasCache.ts

/*
Copyright 2024 New Vector Ltd.
Copyright 2019-2021 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

/**
 * This is meant to be a cache of room alias to room ID so that moving between
 * rooms happens smoothly (for example using browser back / forward buttons).
 *
 * For the moment, it's in memory only and so only applies for the current
 * session for simplicity, but could be extended further in the future.
 *
 * A similar thing could also be achieved via `pushState` with a state object,
 * but keeping it separate like this seems easier in case we do want to extend.
 */
const aliasToIDMap = new Map<string, string>();

export function storeRoomAliasInCache(alias: string, id: string): void {
    aliasToIDMap.set(alias, id);
}

export function getCachedRoomIDForAlias(alias: string): string | undefined {
    return aliasToIDMap.get(alias);
}