Use conditional fork check when configuring gas price

package.json

@@ -53,7 +53,7 @@
     "@truffle/contract": "^4.0.36",
     "buidler-gas-reporter": "^0.1.3",
     "decache": "^4.5.1",
-    "hardhat": "^2.5.0",
+    "hardhat": "^2.6.1",
     "hardhat-gas-reporter": "^1.0.1",
     "mocha": "5.2.0",
     "nyc": "^14.1.1",

plugins/resources/nomiclabs.utils.js

@@ -126,8 +126,11 @@ function configureHardhatEVMGas(networkConfig, api){
   networkConfig.allowUnlimitedContractSize = true;
   networkConfig.blockGasLimit = api.gasLimitNumber;
   networkConfig.gas =  api.gasLimit;
-  networkConfig.gasPrice = api.gasPrice;
+
-  networkConfig.initialBaseFeePerGas = 0;
+  // TODO: etherumjs.gte here or equiv. This will break after london.
+  if (networkConfig.hardfork !== 'london') {
+    networkConfig.gasPrice = api.gasPrice;
+  }
 }
 
 function configureNetworkEnv(env, networkName, networkConfig, provider, isHardhatEVM){

yarn.lock

@@ -131,10 +131,10 @@
     "@ethereumjs/common" "^2.4.0"
     ethereumjs-util "^7.1.0"
 
-"@ethereumjs/vm@^5.5.0":
+"@ethereumjs/vm@^5.5.2":
-  version "5.5.0"
+  version "5.5.2"
-  resolved "https://registry.yarnpkg.com/@ethereumjs/vm/-/vm-5.5.0.tgz#d389c5792320ef28c51366a643b8ab9d64e10a31"
+  resolved "https://registry.yarnpkg.com/@ethereumjs/vm/-/vm-5.5.2.tgz#918a2c1000aaa9fdbe6007a4fdc2c62833122adf"
-  integrity sha512-h6Kr6WqKUP8nVuEzCWPWEPrC63v7HFwt3gRuK7CJiyg9S0iWSBKUA/YVD4YgaSVACuxUfWaOBbwV5uGVupm5PQ==
+  integrity sha512-AydZ4wfvZAsBuFzs3xVSA2iU0hxhL8anXco3UW3oh9maVC34kTEytOfjHf06LTEfN0MF9LDQ4ciLa7If6ZN/sg==
   dependencies:
     "@ethereumjs/block" "^3.4.0"
     "@ethereumjs/blockchain" "^5.4.0"
@@ -3562,16 +3562,16 @@ hardhat-gas-reporter@^1.0.1:
   dependencies:
     eth-gas-reporter "^0.2.19"
 
-hardhat@^2.5.0:
+hardhat@^2.6.1:
-  version "2.5.0"
+  version "2.6.1"
-  resolved "https://registry.yarnpkg.com/hardhat/-/hardhat-2.5.0.tgz#0a10bf85d9b2c3c7c12cfa4e35454296c670c054"
+  resolved "https://registry.yarnpkg.com/hardhat/-/hardhat-2.6.1.tgz#4553ca555c1ba8ed7c3c5a5a93e6082a2869b3ae"
-  integrity sha512-S5CWcmiFZlFF2qFGyf5LlgVnJDXwTs5UBKU3GPQCjsUD3NAIWzXr/4xDSij3YWdg751axgLiKAJM01cHcxGb7A==
+  integrity sha512-0LozdYbPsiTc6ZXsfDQUTV3L0p4CMO5TRbd5qmeWiCYGmhd+7Mvdg4N+nA8w0g3gZ2OKFUmHIYlAbExI488ceQ==
   dependencies:
     "@ethereumjs/block" "^3.4.0"
     "@ethereumjs/blockchain" "^5.4.0"
     "@ethereumjs/common" "^2.4.0"
     "@ethereumjs/tx" "^3.3.0"
-    "@ethereumjs/vm" "^5.5.0"
+    "@ethereumjs/vm" "^5.5.2"
     "@ethersproject/abi" "^5.1.2"
     "@sentry/node" "^5.18.1"
     "@solidity-parser/parser" "^0.11.0"