Remove dotenv in favor of configuration variables

.github/workflows/ci.yml

@@ -1,7 +1,18 @@
 name: "CI"
 
 env:
-  DOTENV_CONFIG_PATH: "./.env.example"
+  HARDHAT_VAR_MNEMONIC: "test test test test test test test test test test test junk"
+  HARDHAT_VAR_INFURA_API_KEY: "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"
+# Uncomment the following lines to set your configuration variables using
+# GitHub secrets (https://docs.github.com/en/actions/security-guides/using-secrets-in-github-actions)
+#   HARDHAT_VAR_MNEMONIC: ${{ secrets.Mnemonic }}
+#   HARDHAT_VAR_INFURA_API_KEY: ${{ secrets.InfuraApiKey }}
+#   HARDHAT_VAR_ARBISCAN_API_KEY: ${{ secrets.ArbiscanApiKey }}
+#   HARDHAT_VAR_BSCSCAN_API_KEY: ${{ secrets.BscscanApiKey }}
+#   HARDHAT_VAR_ETHERSCAN_API_KEY: ${{ secrets.EtherscanApiKey }}
+#   HARDHAT_VAR_OPTIMISM_API_KEY: ${{ secrets.OptimismApiKey }}
+#   HARDHAT_VAR_POLYGONSCAN_API_KEY: ${{ secrets.PolygonscanApiKey }}
+#   HARDHAT_VAR_SNOWTRACE_API_KEY: ${{ secrets.SnowtraceApiKey }}
 
 on:
   workflow_dispatch:

.solcover.js

@@ -1,7 +1,4 @@
 module.exports = {
   istanbulReporter: ["html", "lcov"],
-  providerOptions: {
-    mnemonic: process.env.MNEMONIC,
-  },
   skipFiles: ["test"],
 };

README.md

@@ -60,22 +60,35 @@ request made to the `main` branch.
 
 Note though that to make this work, you must use your `INFURA_API_KEY` and your `MNEMONIC` as GitHub secrets.
 
+For more information on how to set up GitHub secrets, check out the
+[docs](https://docs.github.com/en/actions/security-guides/using-secrets-in-github-actions).
+
 You can edit the CI script in [.github/workflows/ci.yml](./.github/workflows/ci.yml).
 
 ## Usage
 
 ### Pre Requisites
 
-Before being able to run any command, you need to create a `.env` file and set a BIP-39 compatible mnemonic as an
-environment variable. You can follow the example in `.env.example`. If you don't already have a mnemonic, you can use
-this [website](https://iancoleman.io/bip39/) to generate one.
-
-Then, proceed with installing dependencies:
+First, you need to install the dependencies:
 
 ```sh
 $ pnpm install
 ```
 
+Then, you need to set up all the required
+[Hardhat Configuration Variables](https://hardhat.org/hardhat-runner/docs/guides/configuration-variables). You might
+also want to install some that are optional.
+
+To assist with the setup process, run `pnpm dlx hardhat vars setup`. To set a particular value, such as a BIP-39
+mnemonic variable, execute this:
+
+```sh
+$ pnpm dlx hardhat vars set MNEMONIC
+? Enter value: ‣ here is where your twelve words mnemonic should be put my friend
+```
+
+If you do not already have a mnemonic, you can generate one using this [website](https://iancoleman.io/bip39/).
+
 ### Compile
 
 Compile the smart contracts with Hardhat:

hardhat.config.ts

@@ -1,27 +1,17 @@
 import "@nomicfoundation/hardhat-toolbox";
-import { config as dotenvConfig } from "dotenv";
 import "hardhat-deploy";
 import type { HardhatUserConfig } from "hardhat/config";
+import { vars } from "hardhat/config";
 import type { NetworkUserConfig } from "hardhat/types";
-import { resolve } from "path";
 
 import "./tasks/accounts";
 import "./tasks/greet";
 import "./tasks/taskDeploy";
 
-const dotenvConfigPath: string = process.env.DOTENV_CONFIG_PATH || "./.env";
-dotenvConfig({ path: resolve(__dirname, dotenvConfigPath) });
+// Run 'npx hardhat vars setup' to see the list of variables that need to be set
 
-// Ensure that we have all the environment variables we need.
-const mnemonic: string | undefined = process.env.MNEMONIC;
-if (!mnemonic) {
-  throw new Error("Please set your MNEMONIC in a .env file");
-}
-
-const infuraApiKey: string | undefined = process.env.INFURA_API_KEY;
-if (!infuraApiKey) {
-  throw new Error("Please set your INFURA_API_KEY in a .env file");
-}
+const mnemonic: string = vars.get("MNEMONIC");
+const infuraApiKey: string = vars.get("INFURA_API_KEY");
 
 const chainIds = {
   "arbitrum-mainnet": 42161,
@@ -66,14 +56,14 @@ const config: HardhatUserConfig = {
   },
   etherscan: {
     apiKey: {
-      arbitrumOne: process.env.ARBISCAN_API_KEY || "",
-      avalanche: process.env.SNOWTRACE_API_KEY || "",
-      bsc: process.env.BSCSCAN_API_KEY || "",
-      mainnet: process.env.ETHERSCAN_API_KEY || "",
-      optimisticEthereum: process.env.OPTIMISM_API_KEY || "",
-      polygon: process.env.POLYGONSCAN_API_KEY || "",
-      polygonMumbai: process.env.POLYGONSCAN_API_KEY || "",
-      sepolia: process.env.ETHERSCAN_API_KEY || "",
+      arbitrumOne: vars.get("ARBISCAN_API_KEY", ""),
+      avalanche: vars.get("SNOWTRACE_API_KEY", ""),
+      bsc: vars.get("BSCSCAN_API_KEY", ""),
+      mainnet: vars.get("ETHERSCAN_API_KEY", ""),
+      optimisticEthereum: vars.get("OPTIMISM_API_KEY", ""),
+      polygon: vars.get("POLYGONSCAN_API_KEY", ""),
+      polygonMumbai: vars.get("POLYGONSCAN_API_KEY", ""),
+      sepolia: vars.get("ETHERSCAN_API_KEY", ""),
     },
   },
   gasReporter: {

package.json

@@ -23,12 +23,11 @@
     "@typescript-eslint/parser": "^5.44.0",
     "chai": "^4.3.7",
     "cross-env": "^7.0.3",
-    "dotenv": "^16.0.3",
     "eslint": "^8.28.0",
     "eslint-config-prettier": "^8.5.0",
     "ethers": "^6.4.0",
     "fs-extra": "^10.1.0",
-    "hardhat": "^2.12.2",
+    "hardhat": "^2.19.0",
     "hardhat-deploy": "^0.11.29",
     "hardhat-gas-reporter": "^1.0.9",
     "lodash": "^4.17.21",
@@ -38,7 +37,7 @@
     "rimraf": "^4.1.2",
     "solhint": "^3.4.0",
     "solhint-plugin-prettier": "^0.0.5",
-    "solidity-coverage": "^0.8.2",
+    "solidity-coverage": "^0.8.5",
     "ts-generator": "^0.1.1",
     "ts-node": "^10.9.1",
     "typechain": "^8.2.0",
@@ -69,7 +68,7 @@
     "lint": "pnpm lint:sol && pnpm lint:ts && pnpm prettier:check",
     "lint:sol": "solhint --max-warnings 0 \"contracts/**/*.sol\"",
     "lint:ts": "eslint --ignore-path ./.eslintignore --ext .js,.ts .",
-    "postinstall": "DOTENV_CONFIG_PATH=./.env.example pnpm typechain",
+    "postcompile": "pnpm typechain",
     "prettier:check": "prettier --check \"**/*.{js,json,md,sol,ts,yml}\"",
     "prettier:write": "prettier --write \"**/*.{js,json,md,sol,ts,yml}\"",
     "task:deployGreeter": "hardhat task:deployGreeter",