Example implementation of changing a Solidity contract bytecode during the constructor execution.
This code contains a function foo() with hardcoded return value 1 - but in fact it returns 2. It's because the bytecode returned by the constructor is different than the bytecode compiled from the source code.
npm i
npm test
Test result:
MyContract
✔ Deploys with hardcoded 1 (871ms)
✔ Returns 2 instead
2 passing (883ms)