Diamond / Truffle discussion with @mudgen

deployer-example.js

const Diamond = artifacts.require("Diamond");  // can this return a special Diamond abstraction?
const MyToken = artifacts.require("MyToken");

// - create a config to enable the EIP-2535 Diamond spec
// - when that config is enabled, check for the Diamond EIP-165 functions (so we know when we have a Diamond)
// - add special behavior to the @truffle/contract abstraction when EIP-2535 is detected

module.exports = async (deployer) => {
  await deployer.deploy(Diamond);
  const diamond = await Diamond.deployed();

  await deployer.deploy(MyToken);
  const token = await MyToken.deployed();
  
  /*
   * if we don't have a special Diamond abstraction
   */
  await deployer.diamond(diamond).cut(
    token.transfer,
    token.totalSupply
  );
  const diamondAsMyToken = await MyToken.at(diamond.address);
  await diamondAsMyToken.transfer(...);

  /*
   * if we do have a special Diamond abstraction
   */
  await diamond.cut(
    token.transfer,
    token.totalSupply
  );
  await diamond.transfer(...);
  
  // given a special EIP-2535 abstraction instance, we can use the following
  // to detect all the methods (and thus that's where .transfer can come from)
  await diamond.facets(); // throws if no Loupe exists - no biggie, just don't get special methods
}