Viem fee currency demo: Transfer 0.01 CELO and pay gas with cUSD (#2)

* chore(npm): initialise Nodejs

* chore(viem): adds dev and normal dependencies

- ts-node
- typescript
- viem

* chore(viem): adds @types/node devDependency

* chore(viem): adds dotenv dependency

* chore(viem): adds fee currency Transfer

Demo fee currency transfer of 0.01 CELO and paid gas with cUSD.

.env.example

@@ -0,0 +1 @@
+PRIVATE_KEY='<paste your private key here>'

package.json

@@ -0,0 +1,17 @@
+{
+  "name": "feecurrency",
+  "version": "1.0.0",
+  "main": "index.js",
+  "repository": "[email protected]:celo-org/feecurrency.git",
+  "author": "Celo",
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "@types/node": "^20.11.19",
+    "ts-node": "^10.9.2",
+    "typescript": "^5.3.3"
+  },
+  "dependencies": {
+    "dotenv": "^16.4.4",
+    "viem": "^2.7.9"
+  }
+}

viem.ts

@@ -0,0 +1,44 @@
+import { createPublicClient, createWalletClient, http, parseEther, parseGwei } from "viem";
+import { privateKeyToAccount } from "viem/accounts";
+import { celoAlfajores } from "viem/chains";
+
+import "dotenv/config"; // use to read private key from environment variable
+
+const PRIVATE_KEY = process.env.PRIVATE_KEY;
+const RECIPIENT = "0x22579CA45eE22E2E16dDF72D955D6cf4c767B0eF"; // arbitrary address
+
+/**
+ * Boilerplate to create a viem client
+ */
+const account = privateKeyToAccount(`0x${PRIVATE_KEY}`);
+const publicClient = createPublicClient({
+    chain: celoAlfajores,
+    transport: http(),
+});
+const walletClient = createWalletClient({
+    chain: celoAlfajores, // Celo testnet
+    transport: http(),
+});
+
+async function feeCurrencyTransfer() {
+    console.log(`Initiating fee currency transaction...`);
+    const transactionHash = await walletClient.sendTransaction({
+        account, // Sender
+        to: RECIPIENT, // recipient
+        value: parseEther("0.01"), // 0.01 CELO
+        feeCurrency: "0x874069Fa1Eb16D44d622F2e0Ca25eeA172369bC1", // cUSD fee currency
+        maxFeePerGas: parseGwei("10"), // Special field for dynamic fee transaction type (EIP-1559)
+        maxPriorityFeePerGas: parseGwei("10"), // Special field for dynamic fee transaction type (EIP-1559)
+    });
+
+    const transactionReceipt = await publicClient.waitForTransactionReceipt({
+        hash: await transactionHash,
+    });
+
+    console.log(transactionReceipt);
+}
+
+feeCurrencyTransfer().catch((err) => {
+    // Handle any errors that might occur in the demos
+    console.error("An error occurred:", err);
+});

yarn.lock

@@ -0,0 +1,202 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
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