When I do tx.idbtrans, I have an error:

Error: Property 'idbtrans' does not exist on type 'Transaction & { fileInfo: EntityTable<FileInfo, "id">; }'. 
        await db.transaction("rw", x.myUndoTransactionsToApply.tables.flat(), async (tx) => {
          wmNormalUndoOrRedo.set(tx.idbtrans, 2); // 2 means we are in a redo operation
          if(x && x.myUndoTransactionsToApply) 

but if I check the transaction type (either in the documentation or in the source code since I’m using npm link), I can see that idbtrans DOES exist:

$ cat src/classes/transaction/transaction.ts
…
/** Transaction
 * 
 * https://dexie.org/docs/Transaction/Transaction
 * 
 **/
export class Transaction implements ITransaction {
…
  idbtrans: IDBTransaction;
…

Any idea how to debug this? For instance, can I print the full description of Transaction to see what property is supposed to be allowed in Transaction?