Source token: the token whose share of the index you want to decrease
Source units: how many units (as set in the components file ) should be traded for the target token
Target token: the token that you want to add as a component (or whose share you want to increase)
Min return amount: how many units of the target token are expected as a minimum return. The trade transaction will revert if the exchange returns less than this.
For more info on this method and routing via intermediate tokens, see the reference
Warning: It is of critical importance for you to research the exchange rates before trading with production assets and set sane min return and slippage values accordingly. It is recommend that you understand the possible consequences of someone front-running a large volume transaction as well.
The amount of units to be subtracted/added should be provided, and the script and contracts will take care of converting it to the actual amount of the component token.
After doing the trade, you can call [node scripts/poc.js getTokenInfo](symbol) and you should see:
The units of the source token decrease, or the source token dissappearing from the component list if all of its units were sold
The units of the target token increase, or the target token being added to the component list if it wasn't present before.
Note: When adding a new component to the component list, it is worth noting that users that minted the index before that token was added, will receive said token when redeeming, and less of the source token. A side effect of this is that allowances should be done in the new token in order to mint again.