How can i calculate the transaction size or fee ?

[bajian]

As i known ,fees are constructed around two constants (a and b). The formula for calculating minimal fees for a transaction (tx) is a * size(tx) + b, where:
a/b are protocol parameters
size(tx) is the transaction size in bytes

Here,i want to get the size of the tx.So that ,i can estimate the fee.

I searched the dev docs and found the cli cammand below

cardano-cli transaction calculate-min-fee \
--tx-body-file tx.draft \
--tx-in-count 1 \
--tx-out-count 1 \
--witness-count 1 \
--byron-witness-count 0 \
--testnet-magic 1097911063 \
--protocol-params-file protocol.json

This is what i need, and i want to know is there any method can implement the similar function with this js framework?

[bajian]

https://github.com/Berry-Pool/cardanocli-js/blob/main/API.md#CardanocliJs+transactionCalculateMinFee
I have found reference code in cardanocli-js.