Submission/crowd funding/miss yusrah

assignments/1/saving-vault/.gitignore

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+# Node modules
+/node_modules
+
+# Compilation output
+/dist
+
+# pnpm deploy output
+/bundle
+
+# Hardhat Build Artifacts
+/artifacts
+
+# Hardhat compilation (v2) support directory
+/cache
+
+# Typechain output
+/types
+
+# Hardhat coverage reports
+/coverage

assignments/1/saving-vault/README.md

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+# Sample Hardhat 3 Beta Project (`node:test` and `viem`)
+
+This project showcases a Hardhat 3 Beta project using the native Node.js test runner (`node:test`) and the `viem` library for Ethereum interactions.
+
+To learn more about the Hardhat 3 Beta, please visit the [Getting Started guide](https://hardhat.org/docs/getting-started#getting-started-with-hardhat-3). To share your feedback, join our [Hardhat 3 Beta](https://hardhat.org/hardhat3-beta-telegram-group) Telegram group or [open an issue](https://github.com/NomicFoundation/hardhat/issues/new) in our GitHub issue tracker.
+
+## Project Overview
+
+This example project includes:
+
+- A simple Hardhat configuration file.
+- Foundry-compatible Solidity unit tests.
+- TypeScript integration tests using [`node:test`](nodejs.org/api/test.html), the new Node.js native test runner, and [`viem`](https://viem.sh/).
+- Examples demonstrating how to connect to different types of networks, including locally simulating OP mainnet.
+
+## Usage
+
+### Running Tests
+
+To run all the tests in the project, execute the following command:
+
+```shell
+npx hardhat test
+```
+
+You can also selectively run the Solidity or `node:test` tests:
+
+```shell
+npx hardhat test solidity
+npx hardhat test nodejs
+```
+
+### Make a deployment to Sepolia
+
+This project includes an example Ignition module to deploy the contract. You can deploy this module to a locally simulated chain or to Sepolia.
+
+To run the deployment to a local chain:
+
+```shell
+npx hardhat ignition deploy ignition/modules/Counter.ts
+```
+
+To run the deployment to Sepolia, you need an account with funds to send the transaction. The provided Hardhat configuration includes a Configuration Variable called `SEPOLIA_PRIVATE_KEY`, which you can use to set the private key of the account you want to use.
+
+You can set the `SEPOLIA_PRIVATE_KEY` variable using the `hardhat-keystore` plugin or by setting it as an environment variable.
+
+To set the `SEPOLIA_PRIVATE_KEY` config variable using `hardhat-keystore`:
+
+```shell
+npx hardhat keystore set SEPOLIA_PRIVATE_KEY
+```
+
+After setting the variable, you can run the deployment with the Sepolia network:
+
+```shell
+npx hardhat ignition deploy --network sepolia ignition/modules/Counter.ts
+```

assignments/1/saving-vault/contracts/Counter.sol

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+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.28;
+
+contract Counter {
+  uint public x;
+
+  event Increment(uint by);
+
+  function inc() public {
+    x++;
+    emit Increment(1);
+  }
+
+  function incBy(uint by) public {
+    require(by > 0, "incBy: increment should be positive");
+    x += by;
+    emit Increment(by);
+  }
+}

assignments/1/saving-vault/contracts/Counter.t.sol

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+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.28;
+
+import {Counter} from "./Counter.sol";
+import {Test} from "forge-std/Test.sol";
+
+contract CounterTest is Test {
+  Counter counter;
+
+  function setUp() public {
+    counter = new Counter();
+  }
+
+  function test_InitialValue() public view {
+    require(counter.x() == 0, "Initial value should be 0");
+  }
+
+  function testFuzz_Inc(uint8 x) public {
+    for (uint8 i = 0; i < x; i++) {
+      counter.inc();
+    }
+    require(counter.x() == x, "Value after calling inc x times should be x");
+  }
+
+  function test_IncByZero() public {
+    vm.expectRevert();
+    counter.incBy(0);
+  }
+}

assignments/1/saving-vault/contracts/vault.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.26;
+
+contract TimelockedVault {
+
+    enum VaultStatus { 
+        Empty,
+        Locked 
+    }
+
+    struct Vault {
+        uint amount;      
+        uint unlockTime;  
+        VaultStatus status; 
+    }
+
+    mapping(address => Vault) public userVaults;
+
+    event Deposited(address indexed user, uint amount, uint unlockTime);
+    event Withdrawn(address indexed user, uint amount);
+
+    function deposit(uint _lockDurationSeconds) external payable {
+
+        require(msg.value > 0, "Must deposit some ETH");
+        require(userVaults[msg.sender].status == VaultStatus.Empty, "Vault already active");
+
+
+        uint unlockTimestamp = block.timestamp + _lockDurationSeconds;
+
+        userVaults[msg.sender] = Vault({
+            amount: msg.value,
+            unlockTime: unlockTimestamp,
+            status: VaultStatus.Locked
+        });
+
+        emit Deposited(msg.sender, msg.value, unlockTimestamp);
+    }
+
+    function withdraw() external {
+        Vault storage myVault = userVaults[msg.sender];
+
+        require(myVault.status == VaultStatus.Locked, "No active vault found");
+        require(block.timestamp >= myVault.unlockTime, "Funds are still locked");
+
+        uint amountToTransfer = myVault.amount;
+
+
+        delete userVaults[msg.sender];
+
+        // The Transfer
+        (bool success, ) = payable(msg.sender).call{value: amountToTransfer}("");
+        require(success, "Withdrawal failed");
+
+        emit Withdrawn(msg.sender, amountToTransfer);
+    }
+}

assignments/1/saving-vault/hardhat.config.ts

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+import hardhatToolboxViemPlugin from "@nomicfoundation/hardhat-toolbox-viem";
+import { configVariable, defineConfig } from "hardhat/config";
+
+export default defineConfig({
+  plugins: [hardhatToolboxViemPlugin],
+  solidity: {
+    profiles: {
+      default: {
+        version: "0.8.28",
+      },
+      production: {
+        version: "0.8.28",
+        settings: {
+          optimizer: {
+            enabled: true,
+            runs: 200,
+          },
+        },
+      },
+    },
+  },
+  networks: {
+    hardhatMainnet: {
+      type: "edr-simulated",
+      chainType: "l1",
+    },
+    hardhatOp: {
+      type: "edr-simulated",
+      chainType: "op",
+    },
+    sepolia: {
+      type: "http",
+      chainType: "l1",
+      url: configVariable("SEPOLIA_RPC_URL"),
+      accounts: [configVariable("SEPOLIA_PRIVATE_KEY")],
+    },
+  },
+});

assignments/1/saving-vault/ignition/modules/Counter.ts

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+import { buildModule } from "@nomicfoundation/hardhat-ignition/modules";
+
+export default buildModule("CounterModule", (m) => {
+  const counter = m.contract("Counter");
+
+  m.call(counter, "incBy", [5n]);
+
+  return { counter };
+});

assignments/1/saving-vault/package.json

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+{
+  "name": "saving-vault",
+  "version": "1.0.0",
+  "type": "module",
+  "devDependencies": {
+    "@nomicfoundation/hardhat-ignition": "^3.0.7",
+    "@nomicfoundation/hardhat-toolbox-viem": "^5.0.2",
+    "@types/node": "^22.19.8",
+    "forge-std": "github:foundry-rs/forge-std#v1.9.4",
+    "hardhat": "^3.1.6",
+    "typescript": "~5.8.0",
+    "viem": "^2.45.1"
+  }
+}

assignments/1/saving-vault/scripts/send-op-tx.ts

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+import { network } from "hardhat";
+
+const { viem } = await network.connect({
+  network: "hardhatOp",
+  chainType: "op",
+});
+
+console.log("Sending transaction using the OP chain type");
+
+const publicClient = await viem.getPublicClient();
+const [senderClient] = await viem.getWalletClients();
+
+console.log("Sending 1 wei from", senderClient.account.address, "to itself");
+
+const l1Gas = await publicClient.estimateL1Gas({
+  account: senderClient.account.address,
+  to: senderClient.account.address,
+  value: 1n,
+});
+
+console.log("Estimated L1 gas:", l1Gas);
+
+console.log("Sending L2 transaction");
+const tx = await senderClient.sendTransaction({
+  to: senderClient.account.address,
+  value: 1n,
+});
+
+await publicClient.waitForTransactionReceipt({ hash: tx });
+
+console.log("Transaction sent successfully");

assignments/1/saving-vault/test/Counter.ts

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+import assert from "node:assert/strict";
+import { describe, it } from "node:test";
+
+import { network } from "hardhat";
+
+describe("Counter", async function () {
+  const { viem } = await network.connect();
+  const publicClient = await viem.getPublicClient();
+
+  it("Should emit the Increment event when calling the inc() function", async function () {
+    const counter = await viem.deployContract("Counter");
+
+    await viem.assertions.emitWithArgs(
+      counter.write.inc(),
+      counter,
+      "Increment",
+      [1n],
+    );
+  });
+
+  it("The sum of the Increment events should match the current value", async function () {
+    const counter = await viem.deployContract("Counter");
+    const deploymentBlockNumber = await publicClient.getBlockNumber();
+
+    // run a series of increments
+    for (let i = 1n; i <= 10n; i++) {
+      await counter.write.incBy([i]);
+    }
+
+    const events = await publicClient.getContractEvents({
+      address: counter.address,
+      abi: counter.abi,
+      eventName: "Increment",
+      fromBlock: deploymentBlockNumber,
+      strict: true,
+    });
+
+    // check that the aggregated events match the current value
+    let total = 0n;
+    for (const event of events) {
+      total += event.args.by;
+    }
+
+    assert.equal(total, await counter.read.x());
+  });
+});

assignments/1/saving-vault/tsconfig.json

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+/* Based on https://github.com/tsconfig/bases/blob/501da2bcd640cf95c95805783e1012b992338f28/bases/node22.json */
+{
+  "compilerOptions": {
+    "lib": ["es2023"],
+    "module": "node16",
+    "target": "es2022",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "moduleResolution": "node16",
+    "outDir": "dist"
+  }
+}

assignments/crowd-funding/.gitignore

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+# Node modules
+/node_modules
+
+# Compilation output
+/dist
+
+# pnpm deploy output
+/bundle
+
+# Hardhat Build Artifacts
+/artifacts
+
+# Hardhat compilation (v2) support directory
+/cache
+
+# Typechain output
+/types
+
+# Hardhat coverage reports
+/coverage