How to use the matrix-bot-sdk.Permalinks.parseUrl function in matrix-bot-sdk

public async buildWatchedBanLists() {
        const banLists: BanList[] = [];
        const joinedRooms = await this.client.getJoinedRooms();

        let watchedListsEvent = {};
        try {
            watchedListsEvent = await this.client.getAccountData(WATCHED_LISTS_EVENT_TYPE);
        } catch (e) {
            // ignore - not important
        }

        for (const roomRef of (watchedListsEvent['references'] || [])) {
            const permalink = Permalinks.parseUrl(roomRef);
            if (!permalink.roomIdOrAlias) continue;

            const roomId = await this.client.resolveRoom(permalink.roomIdOrAlias);
            if (!joinedRooms.includes(roomId)) {
                await this.client.joinRoom(permalink.roomIdOrAlias, permalink.viaServers);
            }

            const list = new BanList(roomId, roomRef, this.client);
            await list.updateList();
            banLists.push(list);
        }

        this.banLists = banLists;
    }

} else {
        client = new MatrixClient(config.homeserverUrl, config.accessToken, storage);
    }

    if (config.autojoin) {
        AutojoinRoomsMixin.setupOnClient(client);
    }

    const banLists: BanList[] = [];
    const protectedRooms: { [roomId: string]: string } = {};

    const joinedRooms = await client.getJoinedRooms();

    // Ensure we're also joined to the rooms we're protecting
    for (const roomRef of config.protectedRooms) {
        const permalink = Permalinks.parseUrl(roomRef);
        if (!permalink.roomIdOrAlias) continue;

        let roomId = await client.resolveRoom(permalink.roomIdOrAlias);
        if (!joinedRooms.includes(roomId)) {
            roomId = await client.joinRoom(permalink.roomIdOrAlias, permalink.viaServers);
        }

        protectedRooms[roomId] = roomRef;
    }

    // Ensure we're also in the management room
    const managementRoomId = await client.joinRoom(config.managementRoom);
    await client.sendNotice(managementRoomId, "Mjolnir is starting up. Use !mjolnir to query status.");

    const bot = new Mjolnir(client, managementRoomId, protectedRooms, banLists);
    await bot.start();

public async unwatchList(roomRef: string): Promise {
        const permalink = Permalinks.parseUrl(roomRef);
        if (!permalink.roomIdOrAlias) return null;

        const roomId = await this.client.resolveRoom(permalink.roomIdOrAlias);
        const list = this.banLists.find(b => b.roomId === roomId);
        if (list) this.banLists.splice(this.banLists.indexOf(list), 1);

        await this.client.setAccountData(WATCHED_LISTS_EVENT_TYPE, {
            references: this.banLists.map(b => b.roomRef),
        });

        return list;
    }

public async watchList(roomRef: string): Promise {
        const joinedRooms = await this.client.getJoinedRooms();
        const permalink = Permalinks.parseUrl(roomRef);
        if (!permalink.roomIdOrAlias) return null;

        const roomId = await this.client.resolveRoom(permalink.roomIdOrAlias);
        if (!joinedRooms.includes(roomId)) {
            await this.client.joinRoom(permalink.roomIdOrAlias, permalink.viaServers);
        }

        if (this.banLists.find(b => b.roomId === roomId)) return null;

        const list = new BanList(roomId, roomRef, this.client);
        await list.updateList();
        this.banLists.push(list);

        await this.client.setAccountData(WATCHED_LISTS_EVENT_TYPE, {
            references: this.banLists.map(b => b.roomRef),
        });