feat: add snippet to check cUSD balance

constants.js

@@ -0,0 +1,5 @@
+const STABLE_TOKEN_ADDRESS = "0x765DE816845861e75A25fCA122bb6898B8B1282a";
+
+module.exports = {
+    STABLE_TOKEN_ADDRESS,
+};

ethers/checkCUSDBalance.js

@@ -0,0 +1,26 @@
+const ethers = require("ethers");
+const StableToken = require("@celo/abis/StableToken.json");
+const { STABLE_TOKEN_ADDRESS } = require("../constants");
+
+const { Contract, utils } = ethers;
+const { formatEther } = utils;
+
+async function checkCUSDBalance(provider, address) {
+    const StableTokenContract = new Contract(
+        STABLE_TOKEN_ADDRESS,
+        StableToken.abi,
+        provider
+    );
+
+    let balanceInBigNumber = await StableTokenContract.balanceOf(address);
+
+    let balanceInWei = balanceInBigNumber.toString();
+
+    let balanceInEthers = formatEther(balanceInWei); // Ether is a unit = 10 ** 18 wei
+
+    return balanceInEthers;
+}
+
+module.exports = {
+    checkCUSDBalance,
+};

ethers/index.js

@@ -1,9 +1,15 @@
 const ethers = require("ethers");
 const { providers } = ethers;
+const { checkCUSDBalance } = require("./checkCUSDBalance");
 
 const provider = new providers.JsonRpcProvider("https://forno.celo.org");
 
-async function main() {}
+async function main() {
+    // return await checkCUSDBalance(
+    //     provider,
+    //     "0x765de816845861e75a25fca122bb6898b8b1282a"
+    // );
+}
 
 main()
     .then((result) => console.log(result))

package.json

@@ -6,6 +6,7 @@
   "author": "Harpal Jadeja <[email protected]>",
   "license": "MIT",
   "dependencies": {
+    "@celo/abis": "^9.0.6",
     "ethers": "5.7.2",
     "viem": "^1.19.9"
   }

viem/checkCUSDBalance.js

@@ -0,0 +1,25 @@
+const { getContract, formatEther } = require("viem");
+const StableToken = require("@celo/abis/StableToken.json");
+const { STABLE_TOKEN_ADDRESS } = require("../constants");
+
+async function checkCUSDBalance(publicClient, address) {
+    let StableTokenContract = getContract({
+        abi: StableToken.abi,
+        address: STABLE_TOKEN_ADDRESS,
+        publicClient,
+    });
+
+    let balanceInBigNumber = await StableTokenContract.read.balanceOf([
+        address,
+    ]);
+
+    let balanceInWei = balanceInBigNumber.toString();
+
+    let balanceInEthers = formatEther(balanceInWei);
+
+    return balanceInEthers;
+}
+
+module.exports = {
+    checkCUSDBalance,
+};

viem/index.js

@@ -1,13 +1,17 @@
 const { createPublicClient, http } = require("viem");
 const { celo } = require("viem/chains");
+const { checkCUSDBalance } = require("./checkCUSDBalance");
 
 const publicClient = createPublicClient({
     chain: celo,
     transport: http(),
 });
 
 async function main() {
-    return publicClient;
+    // return await checkCUSDBalance(
+    //     publicClient,
+    //     "0x765de816845861e75a25fca122bb6898b8b1282a"
+    // );
 }
 
 main()

yarn.lock

@@ -7,6 +7,11 @@
   resolved "https://registry.yarnpkg.com/@adraffy/ens-normalize/-/ens-normalize-1.10.0.tgz#d2a39395c587e092d77cbbc80acf956a54f38bf7"
   integrity sha512-nA9XHtlAkYfJxY7bce8DcN7eKxWWCWkU+1GR9d+U6MbNpfwQp8TI7vqOsBsMcHoT4mBu2kypKoSKnghEzOOq5Q==
 
+"@celo/abis@^9.0.6":
+  version "9.0.6"
+  resolved "https://registry.yarnpkg.com/@celo/abis/-/abis-9.0.6.tgz#3586f578394cb0408f17335cdaedf98fd9f47d7c"
+  integrity sha512-w/zQWAnJMUfthiFyzUoSKgZ1DQDKjXaSmImwGRDi6U9SPyEx5rWsHm7tsoVXoxYzAdPbtpkeFykQPvPqCJfHmA==
+
 "@ethersproject/[email protected]", "@ethersproject/abi@^5.7.0":
   version "5.7.0"
   resolved "https://registry.yarnpkg.com/@ethersproject/abi/-/abi-5.7.0.tgz#b3f3e045bbbeed1af3947335c247ad625a44e449"