Expose properties from all union variants.
Returns middleware that adds ctx.session for storing arbitrary state per session key.
The default getSessionKey is `${ctx.from.id}:${ctx.chat.id}`.
If either ctx.from or ctx.chat is undefined, default session key and thus ctx.session are also undefined.
Session data is kept only in memory by default,
which means that all data will be lost when the process is terminated.
If you want to store data across restarts, or share it among workers,
you can install persistent session middleware from npm,
or pass custom storage.
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Narrows down
C['update'](and derived getters) to specific update typeU.Used by
Composer, possibly useful for splitting a bot into multiple files.