TLRecordAuthorizers

A map from record typeName to a TLRecordAuthorizer for that record type. Only listed types are authorized; every other record writes through untouched, so this stays off the hot path for the vast majority of writes (shape drags etc.).

Each authorizer is typed to its record — e.g. next in the comment entry is a TLComment — so renaming a field on the record makes the authorizer that reads it fail to compile, rather than silently stamp or guard the wrong field.

Presence records are never authorized (presence is per-session and ephemeral); registering the presence typeName is a construction-time error.

type TLRecordAuthorizers<R extends UnknownRecord, SessionMeta> = {
  [K in R["typeName"]]?: TLRecordAuthorizer<
    Extract<
      R,
      {
        typeName: K;
      }
    >,
    SessionMeta
  >;
};