[examples] Add a simple coin transfer for javascript example

examples/javascript/simple_transfer/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "js-test",
+  "version": "1.0.0",
+  "description": "",
+  "main": "transfer.js",
+  "scripts": {
+    "test": "node transfer.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "aptos": "link:../../.."
+  }
+}

examples/javascript/simple_transfer/transfer.js

@@ -0,0 +1,99 @@
+/**
+ * This example shows how to use the Aptos client to create accounts, fund them, and transfer between them.
+ */
+
+const { Account, AccountAddress, Aptos, AptosConfig, Network, TypeTagStruct, StructTag, U64 } = require("aptos");
+
+const APTOS_COIN = "0x1::coin::CoinStore<0x1::aptos_coin::AptosCoin>";
+const ALICE_INITIAL_BALANCE = 100_000_000;
+const BOB_INITIAL_BALANCE = 100;
+const TRANSFER_AMOUNT = 0;
+
+/**
+ * Prints the balance of an account
+ * @param aptos
+ * @param name
+ * @param address
+ * @returns {Promise<*>}
+ *
+ * TODO: Change to AccountAddress for address
+ */
+const balance = async (aptos, name, address) => {
+  let balance = await aptos.getAccountResource({ accountAddress: address, resourceType: APTOS_COIN });
+
+  let amount = Number(balance.data.coin.value);
+
+  console.log(`${name}'s balance is: ${amount}`);
+  return amount;
+};
+
+const example = async () => {
+  console.log("This example will create two accounts (Alice and Bob), fund them, and transfer between them.");
+
+  // Setup the client
+  const config = new AptosConfig({ network: Network.DEVNET });
+  const aptos = new Aptos(config);
+
+  // Create two accounts
+  let alice = Account.generate({ scheme: 0 });
+  let bob = Account.generate({ scheme: 0 });
+
+  console.log("=== Addresses ===\n");
+  console.log(`Alice's address is: ${alice.accountAddress.toString()}`);
+  console.log(`Bob's address is: ${bob.accountAddress.toString()}`);
+
+  // Fund the accounts
+  console.log("\n=== Funding accounts ===\n");
+
+  const aliceFundTxn = await aptos.faucet.fundAccount({
+    accountAddress: alice.accountAddress.toUint8Array(),
+    amount: ALICE_INITIAL_BALANCE,
+  });
+  console.log("Alice's fund transaction: ", aliceFundTxn);
+
+  const bobFundTxn = await aptos.faucet.fundAccount({
+    accountAddress: bob.accountAddress.toUint8Array(),
+    amount: BOB_INITIAL_BALANCE,
+  });
+  console.log("Bob's fund transaction: ", bobFundTxn);
+
+  // Show the balances
+  console.log("\n=== Balances ===\n");
+  let aliceBalance = await balance(aptos, "Alice", alice.accountAddress.toUint8Array());
+  let bobBalance = await balance(aptos, "Bob", bob.accountAddress.toUint8Array());
+
+  if (aliceBalance !== ALICE_INITIAL_BALANCE) throw new Error("Alice's balance is incorrect");
+  if (bobBalance !== BOB_INITIAL_BALANCE) throw new Error("Bob's balance is incorrect");
+
+  // Transfer between users
+  const txn = await aptos.transactionSubmission.generateTransaction({
+    sender: alice.accountAddress.toString(),
+    data: {
+      function: "0x1::coin::transfer",
+      type_arguments: [new TypeTagStruct(StructTag.fromString("0x1::aptos_coin::AptosCoin"))],
+      arguments: [AccountAddress.fromHexInput({ input: bob.accountAddress.toString() }), new U64(TRANSFER_AMOUNT)],
+    },
+  });
+
+  console.log("\n=== Transfer transaction ===\n");
+  let signature = aptos.transactionSubmission.signTransaction({ signer: alice, transaction: txn });
+  const committedTxn = await aptos.transactionSubmission.submitTransaction({
+    transaction: txn,
+    senderAuthenticator: signature,
+  });
+  console.log(`Committed transaction: ${committedTxn.hash}`);
+
+  console.log("\n=== Balances after transfer ===\n");
+  let newAliceBalance = await balance(aptos, "Alice", alice.accountAddress.toUint8Array());
+  let newBobBalance = await balance(aptos, "Bob", bob.accountAddress.toUint8Array());
+
+  // Bob should have the transfer amount
+  if (newBobBalance !== TRANSFER_AMOUNT + BOB_INITIAL_BALANCE)
+    throw new Error("Bob's balance after transfer is incorrect");
+
+  // Alice should have the remainder minus gas
+  if (newAliceBalance < ALICE_INITIAL_BALANCE - TRANSFER_AMOUNT)
+    throw new Error("Alice's balance after transfer is incorrect");
+};
+
+example();

package.json

@@ -21,9 +21,9 @@
     "_build:browser": "tsup src/index.ts --platform browser --format iife --global-name aptosSDK --minify --out-dir dist/browser",
     "_build:node": "tsup src/index.ts --platform node --format esm,cjs --dts --out-dir dist/node",
     "_build:types": "tsup src/types/index.ts --dts --out-dir dist/types",
-    "_fmt": "prettier 'src/**/*.ts' 'tests/**/*.ts' '.eslintrc.js'",
+    "_fmt": "prettier 'src/**/*.ts' 'tests/**/*.ts' 'examples/**/*.js' '.eslintrc.js'",
     "fmt": "pnpm _fmt --write",
-    "lint": "eslint \"**/*.ts\"",
+    "lint": "eslint '**/*.ts'",
     "test": "pnpm jest",
     "unit-test": "pnpm jest tests/unit",
     "e2e-test": "pnpm jest tests/e2e",