fix: cleaned up hardhat config, fixed gasless transactions

gasless requires _msgSender() instead of msg.sender, at least if we're using OZ's gasless standard. Future-proofing.

1000 round optimization made bytecode size go down 17k -> 8.7k, interesting...

Author: jtakalai

contracts/DATAv2onPolygon.sol

@@ -24,7 +24,7 @@ contract DATAv2onPolygon is DATAv2 {
      * Equal amount of tokens got locked in RootChainManager on the mainnet side
      */
     function deposit(address user, bytes calldata depositData) external {
-        require(msg.sender == bridgeAddress, "error_onlyBridge");
+        require(_msgSender() == bridgeAddress, "error_onlyBridge");
         uint256 amount = abi.decode(depositData, (uint256));
         _mint(address(this), amount);
         transferAndCall(user, amount, depositData);
@@ -34,6 +34,6 @@ contract DATAv2onPolygon is DATAv2 {
      * When returning to mainnet, it's enough to simply burn the tokens on the Polygon side
      */
     function withdraw(uint256 amount) external {
-        _burn(msg.sender, amount);
+        _burn(_msgSender(), amount);
     }
 }

hardhat.config.js

@@ -1,21 +1,7 @@
-/*global task, ethers */
-
 require("@nomiclabs/hardhat-waffle")
 require("solidity-coverage")
 require("hardhat-gas-reporter")
 
-//require("hardhat-erc1820") // this was for ERC777 token study, required for ERC777 tokens
-
-// This is a sample Hardhat task. To learn how to create your own go to
-// https://hardhat.org/guides/create-task.html
-task("accounts", "Prints the list of accounts", async () => {
-    const accounts = await ethers.getSigners()
-
-    for (const account of accounts) {
-        console.log(account.address)
-    }
-})
-
 // You need to export an object to set up your config
 // Go to https://hardhat.org/config/ to learn more
 
@@ -27,29 +13,16 @@ module.exports = {
         compilers: [
             {
                 version: "0.8.6",
+                settings: {
+                    optimizer: {
+                        enabled: true,
+                        runs: 1000,
+                    },
+                },
             },
             {
                 version: "0.4.11"
             }
         ]
     }
-
-    // solidity: {
-    //   version: "0.8.3",
-    //   overrides: {
-    //     "contracts/CrowdsaleToken.sol": {
-    //       version: "0.4.8"
-    //     }
-    //   }
-    // }
-
-    // this seriously breaks things because lots of things don't wait for transactions, also there's no way to do that for HardhatProvider, apparently
-    // networks: {
-    //   hardhat: {
-    //     mining: {
-    //       auto: false,
-    //       interval: 1000,
-    //     },
-    //   },
-    // },
 }