store environment variables as local constants

Author: ItsNickBarry

hardhat.config.ts

@@ -9,6 +9,14 @@ import Dotenv from 'dotenv';
 
 Dotenv.config();
 
+const {
+  NODE_URL_MAINNET,
+  NODE_URL_TESTNET,
+  PKEY_MAINNET,
+  PKEY_TESTNET,
+  REPORT_GAS,
+} = process.env;
+
 export default {
   solidity: {
     version: '0.8.11',
@@ -22,13 +30,13 @@ export default {
 
   networks: {
     mainnet: {
-      url: `${process.env.NODE_URL_MAINNET}`,
-      accounts: [`${process.env.PKEY_MAINNET}`],
+      url: NODE_URL_MAINNET,
+      accounts: [PKEY_MAINNET],
     },
 
     testnet: {
-      url: `${process.env.NODE_URL_TESTNET}`,
-      accounts: [`${process.env.PKEY_TESTNET}`],
+      url: NODE_URL_TESTNET,
+      accounts: [PKEY_TESTNET],
     },
   },
 
@@ -38,7 +46,7 @@ export default {
   },
 
   gasReporter: {
-    enabled: process.env.REPORT_GAS === 'true',
+    enabled: REPORT_GAS === 'true',
   },
 
   spdxLicenseIdentifier: {