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In Tron Squid SDK, the data is processed by repeatedly calling the user-defined batch handler function on batches of on-chain data. The sole argument of the batch handler is its context ctx, and ctx.blocks is an array of Block objects containing the data to be processed, aligned at the block level. For TronBatchProcessor the Block interface is defined as follows: 
export interface Block<F extends FieldSelection = {}> {
  header: BlockHeader<F>
  transactions: Transaction<F>[]
  logs: Log<F>[]
  internalTransactions: InternalTransaction<F>[]
}
F here is the type of the argument of the setFields() processor method. Block.header contains the block header data. The rest of the fields are iterables containing the three kinds of blockchain data. The items within each iterable are ordered in the same way as they are within the block. The exact fields available in each data item type are inferred from the setFields() call argument. The method is documented on the field selection page: