From 51ee2d74b9cdbb124a9df561045e809db21cda70 Mon Sep 17 00:00:00 2001 From: Arthur Gousset <46296830+arthurgousset@users.noreply.github.com> Date: Thu, 15 Feb 2024 19:11:35 +0100 Subject: [PATCH] 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 | 1 + package.json | 17 +++++ viem.ts | 44 +++++++++++ yarn.lock | 202 +++++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 264 insertions(+) create mode 100644 .env.example create mode 100644 package.json create mode 100644 viem.ts create mode 100644 yarn.lock diff --git a/.env.example b/.env.example new file mode 100644 index 0000000..764d13c --- /dev/null +++ b/.env.example @@ -0,0 +1 @@ +PRIVATE_KEY='' \ No newline at end of file diff --git a/package.json b/package.json new file mode 100644 index 0000000..dbef58f --- /dev/null +++ b/package.json @@ -0,0 +1,17 @@ +{ + "name": "feecurrency", + "version": "1.0.0", + "main": "index.js", + "repository": "git@github.com: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" + } +} diff --git a/viem.ts b/viem.ts new file mode 100644 index 0000000..f527a2d --- /dev/null +++ b/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); +}); diff --git a/yarn.lock b/yarn.lock new file mode 100644 index 0000000..1178284 --- /dev/null +++ b/yarn.lock @@ -0,0 +1,202 @@ +# THIS IS AN AUTOGENERATED FILE. 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