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Looking through the cardano-serialization-lib I see a TransactionBuilderConfig and a TransactionBuilder constructor that looks like it takes the Config and exposes add_from_inputs that maybe does the coinSelection that is in a separate module in projects like Nami.
I don't however see how that's exposed in the javascript. Am I missing and/or misunderstanding these things or how they could or should be used??
It should be right there just as you say. The add_inputs_from function on the TransactionBuilder takes the strategy as the second parameter.
So in Javascript if your using this (https://www.npmjs.com/package/@emurgo/cardano-serialization-lib-browser or https://www.npmjs.com/package/@emurgo/cardano-serialization-lib-nodejs), you can import from it the CoinSelectionStrategyCIP2 and pass a strategy to the tx builder like this:
txBuilder.add_inputs_from(utxos, CoinSelectionStrategyCIP2.LargestFirst)
The implementation of the strategies is here: https://github.com/Emurgo/cardano-serialization-lib/blob/6a8c67a0fdb2ac6d72132d9693b87a6734f3fed5/rust/src/tx_builder.rs#L329
