diff --git a/.DS_Store b/.DS_Store
index c472ebc..741cd65 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/.circleci/config.yml b/.circleci/config.yml
index a11a9b6..a3005af 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -13,6 +13,7 @@ commands:
   test:
     steps:
       - run: npm i
+      - run: npx hardhat compile
       - run: npx hardhat coverage
       - codecov/upload
 executors:
diff --git a/.gitignore b/.gitignore
index 6762f75..389dd53 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@ node_modules
 .idea
 coverage
 coverage.json
+typechain-types
 
 #Hardhat files
 cache
diff --git a/contracts/Lottery.sol b/contracts/Lottery.sol
index 3d3f66d..d2e1a5f 100644
--- a/contracts/Lottery.sol
+++ b/contracts/Lottery.sol
@@ -106,19 +106,6 @@ contract Lottery is Ownable {
         _;
     }
 
-    /* @dev check that minting period is still open
-    for when user tries to mint more tickets
-    */
-    modifier isLotteryMintingOpen() {
-        if (
-            !(lotteries[currentLotteryId].isActive == true &&
-                lotteries[currentLotteryId].endTime > block.timestamp &&
-                lotteries[currentLotteryId].startTime <= block.timestamp)
-        ) {
-            revert Lottery__MintingPeriodClosed();
-        }
-        _;
-    }
     /* @dev check that minting period is completed, and lottery drawing can begin
     either:
     1) minting period manually ended, ie lottery is inactive. Then drawing can begin immediately.
diff --git a/contracts/Random.sol b/contracts/Random.sol
index d2b8daa..d7369cb 100644
--- a/contracts/Random.sol
+++ b/contracts/Random.sol
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: UNLICENSED
-pragma solidity >=0.8.9;
+pragma solidity ^0.8.0;
 
 library Random {
     /*
diff --git a/hardhat.config.js b/hardhat.config.js
deleted file mode 100644
index f1fefd8..0000000
--- a/hardhat.config.js
+++ /dev/null
@@ -1,19 +0,0 @@
-require("@nomiclabs/hardhat-waffle");
-require("hardhat-gas-reporter");
-require("solidity-coverage");
-require("hardhat-contract-sizer");
-
-// The next line is part of the sample project, you don't need it in your
-// project. It imports a Hardhat task definition, that can be used for
-// testing the frontend.
-require("./tasks/faucet");
-
-// If you are using MetaMask, be sure to change the chainId to 1337
-module.exports = {
-  solidity: "0.8.12",
-  networks: {
-    hardhat: {
-      chainId: 31337,
-    },
-  },
-};
diff --git a/hardhat.config.ts b/hardhat.config.ts
new file mode 100644
index 0000000..1ab5fd5
--- /dev/null
+++ b/hardhat.config.ts
@@ -0,0 +1,64 @@
+import { task, HardhatUserConfig } from "hardhat/config";
+import "@nomiclabs/hardhat-waffle";
+import "hardhat-gas-reporter";
+import "solidity-coverage";
+import "hardhat-contract-sizer";
+import "@typechain/hardhat";
+import "@nomiclabs/hardhat-ethers";
+import "hardhat-watcher";
+
+// The next line is part of the sample project, you don't need it in your
+// project. It imports a Hardhat task definition, that can be used for
+// testing the frontend.
+require("./tasks/faucet");
+
+// If you are using MetaMask, be sure to change the chainId to 1337
+const config: HardhatUserConfig = {
+  solidity: {
+    version: "0.8.9",
+    settings: {
+      optimizer: {
+        enabled: true,
+        runs: 150,
+      },
+    },
+  },
+  networks: {
+    hardhat: {
+      chainId: 31337,
+      allowUnlimitedContractSize: true,
+    },
+    // rinkeby: {
+    // url: "https://eth-rinkeby.alchemyapi.io/v2/123abc123abc123abc123abc123abcde",
+    // accounts: [privateKey1, privateKey2, ...]
+    // },
+  },
+  paths: {
+    sources: "./contracts",
+    tests: "./test",
+    cache: "./cache",
+    artifacts: "./artifacts",
+  },
+  contractSizer: {
+    alphaSort: true,
+    runOnCompile: false,
+  },
+  watcher: {
+    test: {
+      tasks: [
+        "clean",
+        { command: "compile", params: { quiet: true } },
+        {
+          command: "test",
+          params: {
+            testFiles: ["./test/unit/index.ts"],
+          },
+        },
+      ],
+      files: ["./test/**/*"],
+      verbose: true,
+    },
+  },
+};
+
+export default config;
diff --git a/package-lock.json b/package-lock.json
index 76a0d3b..7d87d35 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,18 +12,27 @@
         "@solidity-parser/parser": "^0.14.1",
         "hardhat-contract-sizer": "^2.5.1",
         "hardhat-gas-reporter": "^1.0.8",
+        "hardhat-watcher": "^2.3.0",
         "solidity-coverage": "^0.7.21"
       },
       "devDependencies": {
         "@nomiclabs/hardhat-ethers": "^2.0.2",
         "@nomiclabs/hardhat-waffle": "^2.0.1",
-        "chai": "^4.2.0",
+        "@typechain/ethers-v5": "^10.1.0",
+        "@typechain/hardhat": "^6.1.0",
+        "@types/chai": "^4.3.1",
+        "@types/mocha": "^9.1.1",
+        "@types/node": "^17.0.44",
+        "chai": "^4.3.6",
         "ethereum-waffle": "^3.1.1",
         "ethers": "^5.0.0",
         "hardhat": "^2.3.0",
         "husky": "^4.2.5",
         "prettier": "^2.5.1",
-        "prettier-plugin-solidity": "^1.0.0-beta.19"
+        "prettier-plugin-solidity": "^1.0.0-beta.19",
+        "ts-node": "^10.8.1",
+        "typechain": "^8.1.0",
+        "typescript": "^4.7.3"
       }
     },
     "node_modules/@babel/code-frame": {
@@ -70,6 +79,18 @@
         "node": ">=0.1.90"
       }
     },
+    "node_modules/@cspotcode/source-map-support": {
+      "version": "0.8.1",
+      "resolved": "https://registry.npmjs.org/@cspotcode/source-map-support/-/source-map-support-0.8.1.tgz",
+      "integrity": "sha512-IchNf6dN4tHoMFIn/7OE8LWZ19Y6q/67Bmf6vnGREv8RSbBVb9LPJxEcnwrcwX6ixSvaiGoomAUvu4YSxXrVgw==",
+      "devOptional": true,
+      "dependencies": {
+        "@jridgewell/trace-mapping": "0.3.9"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/@ensdomains/ens": {
       "version": "0.4.5",
       "resolved": "https://registry.npmjs.org/@ensdomains/ens/-/ens-0.4.5.tgz",
@@ -318,6 +339,126 @@
         "node": ">=10.0"
       }
     },
+    "node_modules/@ethereum-waffle/compiler/node_modules/@typechain/ethers-v5": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@typechain/ethers-v5/-/ethers-v5-2.0.0.tgz",
+      "integrity": "sha512-0xdCkyGOzdqh4h5JSf+zoWx85IusEjDcPIwNEHP8mrWSnCae4rvrqB+/gtpdNfX7zjlFlZiMeePn2r63EI3Lrw==",
+      "dev": true,
+      "dependencies": {
+        "ethers": "^5.0.2"
+      },
+      "peerDependencies": {
+        "ethers": "^5.0.0",
+        "typechain": "^3.0.0"
+      }
+    },
+    "node_modules/@ethereum-waffle/compiler/node_modules/array-back": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/array-back/-/array-back-2.0.0.tgz",
+      "integrity": "sha512-eJv4pLLufP3g5kcZry0j6WXpIbzYw9GUB4mVJZno9wfwiBxbizTnHCw3VJb07cBihbFX48Y7oSrW9y+gt4glyw==",
+      "dev": true,
+      "dependencies": {
+        "typical": "^2.6.1"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/@ethereum-waffle/compiler/node_modules/command-line-args": {
+      "version": "4.0.7",
+      "resolved": "https://registry.npmjs.org/command-line-args/-/command-line-args-4.0.7.tgz",
+      "integrity": "sha512-aUdPvQRAyBvQd2n7jXcsMDz68ckBJELXNzBybCHOibUWEg0mWTnaYCSRU8h9R+aNRSvDihJtssSRCiDRpLaezA==",
+      "dev": true,
+      "dependencies": {
+        "array-back": "^2.0.0",
+        "find-replace": "^1.0.3",
+        "typical": "^2.6.1"
+      },
+      "bin": {
+        "command-line-args": "bin/cli.js"
+      }
+    },
+    "node_modules/@ethereum-waffle/compiler/node_modules/debug": {
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
+      "dev": true,
+      "dependencies": {
+        "ms": "2.1.2"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@ethereum-waffle/compiler/node_modules/find-replace": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/find-replace/-/find-replace-1.0.3.tgz",
+      "integrity": "sha512-KrUnjzDCD9426YnCP56zGYy/eieTnhtK6Vn++j+JJzmlsWWwEkDnsyVF575spT6HJ6Ow9tlbT3TQTDsa+O4UWA==",
+      "dev": true,
+      "dependencies": {
+        "array-back": "^1.0.4",
+        "test-value": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=4.0.0"
+      }
+    },
+    "node_modules/@ethereum-waffle/compiler/node_modules/find-replace/node_modules/array-back": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/array-back/-/array-back-1.0.4.tgz",
+      "integrity": "sha512-1WxbZvrmyhkNoeYcizokbmh5oiOCIfyvGtcqbK3Ls1v1fKcquzxnQSceOx6tzq7jmai2kFLWIpGND2cLhH6TPw==",
+      "dev": true,
+      "dependencies": {
+        "typical": "^2.6.0"
+      },
+      "engines": {
+        "node": ">=0.12.0"
+      }
+    },
+    "node_modules/@ethereum-waffle/compiler/node_modules/ms": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+      "dev": true
+    },
+    "node_modules/@ethereum-waffle/compiler/node_modules/ts-essentials": {
+      "version": "6.0.7",
+      "resolved": "https://registry.npmjs.org/ts-essentials/-/ts-essentials-6.0.7.tgz",
+      "integrity": "sha512-2E4HIIj4tQJlIHuATRHayv0EfMGK3ris/GRk1E3CFnsZzeNV+hUmelbaTZHLtXaZppM5oLhHRtO04gINC4Jusw==",
+      "dev": true,
+      "peerDependencies": {
+        "typescript": ">=3.7.0"
+      }
+    },
+    "node_modules/@ethereum-waffle/compiler/node_modules/typechain": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/typechain/-/typechain-3.0.0.tgz",
+      "integrity": "sha512-ft4KVmiN3zH4JUFu2WJBrwfHeDf772Tt2d8bssDTo/YcckKW2D+OwFrHXRC6hJvO3mHjFQTihoMV6fJOi0Hngg==",
+      "dev": true,
+      "dependencies": {
+        "command-line-args": "^4.0.7",
+        "debug": "^4.1.1",
+        "fs-extra": "^7.0.0",
+        "js-sha3": "^0.8.0",
+        "lodash": "^4.17.15",
+        "ts-essentials": "^6.0.3",
+        "ts-generator": "^0.1.1"
+      },
+      "bin": {
+        "typechain": "dist/cli/cli.js"
+      }
+    },
+    "node_modules/@ethereum-waffle/compiler/node_modules/typical": {
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/typical/-/typical-2.6.1.tgz",
+      "integrity": "sha512-ofhi8kjIje6npGozTip9Fr8iecmYfEbS06i0JnIg+rh51KakryWF4+jX8lLKZVhy6N+ID45WYSFCxPOdTWCzNg==",
+      "dev": true
+    },
     "node_modules/@ethereum-waffle/ens": {
       "version": "3.3.1",
       "resolved": "https://registry.npmjs.org/@ethereum-waffle/ens/-/ens-3.3.1.tgz",
@@ -362,48 +503,56 @@
       }
     },
     "node_modules/@ethereumjs/block": {
-      "version": "3.6.1",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/block/-/block-3.6.1.tgz",
-      "integrity": "sha512-o5d/zpGl4SdVfdTfrsq9ZgYMXddc0ucKMiFW5OphBCX+ep4xzYnSjboFcZXT2V/tcSBr84VrKWWp21CGVb3DGw==",
+      "version": "3.6.2",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/block/-/block-3.6.2.tgz",
+      "integrity": "sha512-mOqYWwMlAZpYUEOEqt7EfMFuVL2eyLqWWIzcf4odn6QgXY8jBI2NhVuJncrMCKeMZrsJAe7/auaRRB6YcdH+Qw==",
       "dependencies": {
-        "@ethereumjs/common": "^2.6.1",
-        "@ethereumjs/tx": "^3.5.0",
+        "@ethereumjs/common": "^2.6.3",
+        "@ethereumjs/tx": "^3.5.1",
         "ethereumjs-util": "^7.1.4",
-        "merkle-patricia-tree": "^4.2.3"
+        "merkle-patricia-tree": "^4.2.4"
       }
     },
     "node_modules/@ethereumjs/blockchain": {
-      "version": "5.5.1",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/blockchain/-/blockchain-5.5.1.tgz",
-      "integrity": "sha512-JS2jeKxl3tlaa5oXrZ8mGoVBCz6YqsGG350XVNtHAtNZXKk7pU3rH4xzF2ru42fksMMqzFLzKh9l4EQzmNWDqA==",
+      "version": "5.5.3",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/blockchain/-/blockchain-5.5.3.tgz",
+      "integrity": "sha512-bi0wuNJ1gw4ByNCV56H0Z4Q7D+SxUbwyG12Wxzbvqc89PXLRNR20LBcSUZRKpN0+YCPo6m0XZL/JLio3B52LTw==",
       "dependencies": {
-        "@ethereumjs/block": "^3.6.0",
-        "@ethereumjs/common": "^2.6.0",
+        "@ethereumjs/block": "^3.6.2",
+        "@ethereumjs/common": "^2.6.4",
         "@ethereumjs/ethash": "^1.1.0",
-        "debug": "^2.2.0",
-        "ethereumjs-util": "^7.1.3",
+        "debug": "^4.3.3",
+        "ethereumjs-util": "^7.1.5",
         "level-mem": "^5.0.1",
         "lru-cache": "^5.1.1",
         "semaphore-async-await": "^1.5.1"
       }
     },
     "node_modules/@ethereumjs/blockchain/node_modules/debug": {
-      "version": "2.6.9",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
       "dependencies": {
-        "ms": "2.0.0"
+        "ms": "2.1.2"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
       }
     },
     "node_modules/@ethereumjs/blockchain/node_modules/ms": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
     },
     "node_modules/@ethereumjs/common": {
-      "version": "2.6.2",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.6.2.tgz",
-      "integrity": "sha512-vDwye5v0SVeuDky4MtKsu+ogkH2oFUV8pBKzH/eNBzT8oI91pKa8WyzDuYuxOQsgNgv5R34LfFDh2aaw3H4HbQ==",
+      "version": "2.6.4",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/common/-/common-2.6.4.tgz",
+      "integrity": "sha512-RDJh/R/EAr+B7ZRg5LfJ0BIpf/1LydFgYdvZEuTraojCbVypO2sQ+QnpP5u2wJf9DASyooKqu8O4FJEWUV6NXw==",
       "dependencies": {
         "crc-32": "^1.2.0",
         "ethereumjs-util": "^7.1.4"
@@ -422,37 +571,37 @@
       }
     },
     "node_modules/@ethereumjs/tx": {
-      "version": "3.5.0",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-3.5.0.tgz",
-      "integrity": "sha512-/+ZNbnJhQhXC83Xuvy6I9k4jT5sXiV0tMR9C+AzSSpcCV64+NB8dTE1m3x98RYMqb8+TLYWA+HML4F5lfXTlJw==",
+      "version": "3.5.2",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/tx/-/tx-3.5.2.tgz",
+      "integrity": "sha512-gQDNJWKrSDGu2w7w0PzVXVBNMzb7wwdDOmOqczmhNjqFxFuIbhVJDwiGEnxFNC2/b8ifcZzY7MLcluizohRzNw==",
       "dependencies": {
-        "@ethereumjs/common": "^2.6.1",
-        "ethereumjs-util": "^7.1.4"
+        "@ethereumjs/common": "^2.6.4",
+        "ethereumjs-util": "^7.1.5"
       }
     },
     "node_modules/@ethereumjs/vm": {
-      "version": "5.7.1",
-      "resolved": "https://registry.npmjs.org/@ethereumjs/vm/-/vm-5.7.1.tgz",
-      "integrity": "sha512-NiFm5FMaeDGZ9ojBL+Y9Y/xhW6S4Fgez+zPBM402T5kLsfeAR9mrRVckYhvkGVJ6FMwsY820CLjYP5OVwMjLTg==",
-      "dependencies": {
-        "@ethereumjs/block": "^3.6.1",
-        "@ethereumjs/blockchain": "^5.5.1",
-        "@ethereumjs/common": "^2.6.2",
-        "@ethereumjs/tx": "^3.5.0",
+      "version": "5.9.2",
+      "resolved": "https://registry.npmjs.org/@ethereumjs/vm/-/vm-5.9.2.tgz",
+      "integrity": "sha512-6zvH7iuMI7+74aGak6j9+GDYpV2T08vy2FL4iSK1PId7lNyjFELCAzDCSTQcVoyPoRMkZvRHy79W+djwvguMCA==",
+      "dependencies": {
+        "@ethereumjs/block": "^3.6.2",
+        "@ethereumjs/blockchain": "^5.5.3",
+        "@ethereumjs/common": "^2.6.4",
+        "@ethereumjs/tx": "^3.5.2",
         "async-eventemitter": "^0.2.4",
         "core-js-pure": "^3.0.1",
         "debug": "^4.3.3",
-        "ethereumjs-util": "^7.1.4",
+        "ethereumjs-util": "^7.1.5",
         "functional-red-black-tree": "^1.0.1",
         "mcl-wasm": "^0.7.1",
-        "merkle-patricia-tree": "^4.2.3",
+        "merkle-patricia-tree": "^4.2.4",
         "rustbn.js": "~0.2.0"
       }
     },
     "node_modules/@ethereumjs/vm/node_modules/debug": {
-      "version": "4.3.3",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.3.tgz",
-      "integrity": "sha512-/zxw5+vh1Tfv+4Qn7a5nsbcJKPaSvCDhojn6FEl9vupwK2VCSDtEiEtqr8DFtzYFOdz63LBkxec7DYuc2jon6Q==",
+      "version": "4.3.4",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+      "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
       "dependencies": {
         "ms": "2.1.2"
       },
@@ -1151,6 +1300,31 @@
         "@ethersproject/strings": "^5.5.0"
       }
     },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.0.7",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.0.7.tgz",
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       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
-      "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE="
+      "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE=",
+      "dev": true
     },
     "websocket": {
       "version": "1.0.34",
@@ -34294,6 +36264,7 @@
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
       "integrity": "sha1-lmRU6HZUYuN2RNNib2dCzotwll0=",
+      "dev": true,
       "requires": {
         "tr46": "~0.0.3",
         "webidl-conversions": "^3.0.0"
@@ -34367,6 +36338,29 @@
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus="
     },
+    "wordwrapjs": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/wordwrapjs/-/wordwrapjs-4.0.1.tgz",
+      "integrity": "sha512-kKlNACbvHrkpIw6oPeYDSmdCTu2hdMHoyXLTcUKala++lx5Y+wjJ/e474Jqv5abnVmwxw08DiTuHmw69lJGksA==",
+      "dev": true,
+      "requires": {
+        "reduce-flatten": "^2.0.0",
+        "typical": "^5.2.0"
+      },
+      "dependencies": {
+        "typical": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/typical/-/typical-5.2.0.tgz",
+          "integrity": "sha512-dvdQgNDNJo+8B2uBQoqdb11eUCE1JQXhvjC/CZtgvZseVd5TYMXnq0+vuUemXbd/Se29cTaUuPX3YIc2xgbvIg==",
+          "dev": true
+        }
+      }
+    },
+    "workerpool": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.2.0.tgz",
+      "integrity": "sha512-Rsk5qQHJ9eowMH28Jwhe8HEbmdYDX4lwoMWshiCXugjtHqMD9ZbiqSDLxcsfdqsETPzVUtX5s1Z5kStiIM6l4A=="
+    },
     "wrap-ansi": {
       "version": "5.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
@@ -34584,11 +36578,16 @@
         "yargs": "^13.3.0"
       }
     },
+    "yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "devOptional": true
+    },
     "yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
-      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
-      "dev": true
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q=="
     }
   }
 }
diff --git a/package.json b/package.json
index 796209d..8ecba46 100644
--- a/package.json
+++ b/package.json
@@ -25,19 +25,28 @@
   "devDependencies": {
     "@nomiclabs/hardhat-ethers": "^2.0.2",
     "@nomiclabs/hardhat-waffle": "^2.0.1",
-    "chai": "^4.2.0",
+    "@typechain/ethers-v5": "^10.1.0",
+    "@typechain/hardhat": "^6.1.0",
+    "@types/chai": "^4.3.1",
+    "@types/mocha": "^9.1.1",
+    "@types/node": "^17.0.44",
+    "chai": "^4.3.6",
     "ethereum-waffle": "^3.1.1",
     "ethers": "^5.0.0",
     "hardhat": "^2.3.0",
     "husky": "^4.2.5",
     "prettier": "^2.5.1",
-    "prettier-plugin-solidity": "^1.0.0-beta.19"
+    "prettier-plugin-solidity": "^1.0.0-beta.19",
+    "ts-node": "^10.8.1",
+    "typechain": "^8.1.0",
+    "typescript": "^4.7.3"
   },
   "dependencies": {
     "@openzeppelin/contracts": "^4.5.0",
     "@solidity-parser/parser": "^0.14.1",
     "hardhat-contract-sizer": "^2.5.1",
     "hardhat-gas-reporter": "^1.0.8",
+    "hardhat-watcher": "^2.3.0",
     "solidity-coverage": "^0.7.21"
   }
 }
diff --git a/test/Lottery.test.js b/test/Lottery.test.ts
similarity index 76%
rename from test/Lottery.test.js
rename to test/Lottery.test.ts
index 3e827e4..531928f 100644
--- a/test/Lottery.test.js
+++ b/test/Lottery.test.ts
@@ -1,23 +1,32 @@
-const { expect } = require("chai");
-const { BigNumber } = require("ethers");
-const { ethers, waffle } = require("hardhat");
+import { expect } from "chai";
+import { BigNumber, ContractFactory } from "ethers";
+import { ethers, waffle } from "hardhat";
+import { Lottery } from "../typechain-types";
+import { SignerWithAddress } from "@nomiclabs/hardhat-ethers/signers";
+import { Sign } from "crypto";
+import { MockProvider } from "ethereum-waffle";
 
 describe("Lottery contract", function () {
-  let Lottery;
-  let LotteryContract;
-  let addrs;
-  const unixtimeNow = Math.floor(Date.now() / 1000);
-  const hoursInSeconds = 3600;
-  const expectedMinAmountInWei = BigNumber.from("100000000000000");
+  let Lottery: ContractFactory;
+  let LotteryContract: Lottery;
+  let addrs: SignerWithAddress[];
+  const unixtimeNow: number = Math.floor(Date.now() / 1000);
+  const hoursInSeconds: number = 3600;
+  const expectedMinAmountInWei: BigNumber = BigNumber.from("100000000000000");
 
   beforeEach(async function () {
     Lottery = await ethers.getContractFactory("Lottery");
     [...addrs] = await ethers.getSigners();
 
-    LotteryContract = await Lottery.deploy();
+    LotteryContract = (await Lottery.deploy()) as Lottery;
     await LotteryContract.deployed();
   });
 
+  it("*Happy Path: Should init lottery with default numHours = 0", async function () {
+    await expect(LotteryContract.initLottery(unixtimeNow, 0)).to.not.be
+      .reverted;
+  });
+
   // You can nest describe calls to create subsections.
   describe("1)...Deployment", function () {
     // assume all variables related to uint256 are BigNumbers
@@ -38,9 +47,10 @@ describe("Lottery contract", function () {
       const tx = await LotteryContract.setMaxPlayersAllowed(3);
       const receipt = await tx.wait();
 
-      const { maxPlayersAllowed } = { ...receipt.events[0].args };
-      expect(maxPlayersAllowed).to.equal(3);
-
+      const event = {
+        ...receipt.events![0].args,
+      };
+      expect(event.maxPlayersAllowed).to.equal(3);
       expect(await LotteryContract.maxPlayersAllowed()).to.equal(3);
     });
 
@@ -51,12 +61,14 @@ describe("Lottery contract", function () {
 
       const expectedStartTime = unixtimeNow;
       const expectedEndTime = unixtimeNow + numHours * hoursInSeconds;
-      const { creator, startTime, endTime } = receipt.events[0].args;
+      const event = {
+        ...receipt.events![0].args,
+      };
 
-      expect(receipt.events.length).to.equal(1); // 1 event emitted
-      expect(creator).to.equal(addrs[0].address);
-      expect(startTime).to.equal(expectedStartTime);
-      expect(endTime).to.equal(expectedEndTime);
+      expect(receipt.events!.length).to.equal(1); // 1 event emitted
+      expect(event.creator).to.equal(addrs[0].address);
+      expect(event.startTime).to.equal(expectedStartTime);
+      expect(event.endTime).to.equal(expectedEndTime);
 
       const currentLotteryId = await LotteryContract.currentLotteryId();
       expect(currentLotteryId).to.equal(0);
@@ -70,6 +82,20 @@ describe("Lottery contract", function () {
       expect(lottery.isActive).to.be.true;
     });
 
+    it("Should not allow withdrawals with no funds to withdraw", async function () {
+      await expect(LotteryContract.withdraw(1)).to.be.revertedWith(
+        "Lottery__InvalidWithdrawalAmount"
+      );
+    });
+
+    it("Should not allow minting tickets from non-existent lottery", async function () {
+      await expect(
+        LotteryContract.mintLotteryTickets({
+          value: "1000",
+        })
+      ).to.be.revertedWith("Lottery__InadequateFunds");
+    });
+
     /* TASK: test init new lottery without being owner
      */
     it("Should not allow new lottery to be initialized by non owner", async function () {});
@@ -78,13 +104,12 @@ describe("Lottery contract", function () {
       /* TASK: refactor - maybe put currentLotteryId into lottery object
     for later tests when multiple lottos will be added (maybe concurrently)
      */
-      let currentLotteryId, owner;
+      let currentLotteryId: BigNumber, owner: SignerWithAddress;
       beforeEach(async function () {
         const tx = await LotteryContract.initLottery(unixtimeNow, 1);
         currentLotteryId = await LotteryContract.currentLotteryId();
         owner = addrs[0];
       });
-      owner;
       it("Should not allow an invalid lottery to be saved", async function () {
         await expect(
           LotteryContract.initLottery(unixtimeNow, 0)
@@ -98,6 +123,10 @@ describe("Lottery contract", function () {
         expect(lottery.isActive).to.be.false;
       });
 
+      it("*Happy Path: should cancel lottery", async function () {
+        await expect(LotteryContract.cancelLottery()).to.not.be.reverted;
+      });
+
       describe("...After first lottery set inactive before any player has minted", function () {
         beforeEach(async function () {
           await LotteryContract.setLotteryInactive();
@@ -132,16 +161,18 @@ describe("Lottery contract", function () {
         const expectedNumTicketsMinted = value.div(expectedMinAmountInWei);
 
         // check emitted event details
-        const { player, numTicketsMinted } = { ...receipt.events[0].args };
-        expect(player).to.be.equal(addrs[0].address);
-        expect(numTicketsMinted).to.be.equal(expectedNumTicketsMinted);
+        const event = {
+          ...receipt.events![0].args,
+        };
+        expect(event.player).to.be.equal(addrs[0].address);
+        expect(event.numTicketsMinted).to.be.equal(expectedNumTicketsMinted);
 
         expect(await LotteryContract.listOfPlayers(0)).to.be.equal(
           addrs[0].address
         );
         expect(await LotteryContract.numActivePlayers()).to.be.equal(1);
         expect(await LotteryContract.numTotalTickets()).to.be.equal(
-          numTicketsMinted
+          event.numTicketsMinted
         );
         expect(await LotteryContract.players(addrs[0].address)).to.be.equal(
           true
@@ -152,10 +183,10 @@ describe("Lottery contract", function () {
       });
 
       describe("...After player1 mints tickets", function () {
-        const players = [];
-        let expectedNumTotalTicketsMinted;
+        const players: any = [];
+        let expectedNumTotalTicketsMinted: BigNumber;
         beforeEach(async function () {
-          const player1 = addrs[0];
+          const player1: SignerWithAddress = addrs[0];
           const mintValue = ethers.utils.parseEther("1.0");
           const tx = await LotteryContract.mintLotteryTickets({
             value: mintValue, // Sends exactly 1.0 ether
@@ -192,9 +223,11 @@ describe("Lottery contract", function () {
           );
 
           // event logs tests
-          const { player, numTicketsMinted } = { ...receipt.events[0].args };
-          expect(player).to.be.equal(player2.address);
-          expect(numTicketsMinted).to.be.equal(expectedNumTicketsMinted);
+          const event = {
+            ...receipt.events![0].args,
+          };
+          expect(event.player).to.be.equal(player2.address);
+          expect(event.numTicketsMinted).to.be.equal(expectedNumTicketsMinted);
           /* TASK: add tests here to check the total # of tickets for given address - tickets getter
            */
           expect(await LotteryContract.listOfPlayers(1)).to.be.equal(
@@ -211,7 +244,34 @@ describe("Lottery contract", function () {
             expectedNumTicketsMinted
           );
         });
+        it("*Happy Path: Find winning address with only 1 player", async function () {
+          await LotteryContract.connect(owner).setLotteryInactive();
+          await LotteryContract.triggerLotteryDrawing();
+          const winningTicket = await LotteryContract.winningTicket();
+
+          let ticketDistribution = await Promise.all(
+            players.map(async (player: SignerWithAddress, ind: number) => {
+              return await LotteryContract.getTicketDistribution(ind);
+            })
+          );
+          // confirm the winner
+          const expectedWinner = ticketDistribution.filter((distribution) => {
+            return (
+              distribution.startIndex.lte(winningTicket.winningTicketIndex) &&
+              distribution.endIndex.gte(winningTicket.winningTicketIndex)
+            );
+          })[0];
+
+          expect(expectedWinner.playerAddress).to.be.equal(winningTicket.addr);
+          expect(
+            expectedWinner.startIndex.lte(winningTicket.winningTicketIndex)
+          ).to.be.equal(true);
+          expect(
+            expectedWinner.endIndex.gte(winningTicket.winningTicketIndex)
+          ).to.be.equal(true);
+        });
         describe("...After player2 mints tickets", function () {
+          let expectedNumTicketsPlayer2: BigNumber;
           beforeEach(async function () {
             const mintValue = ethers.utils.parseEther("0.5");
             const player2 = addrs[1];
@@ -238,17 +298,20 @@ describe("Lottery contract", function () {
             const receipt = await tx.wait();
 
             const expectedNumTicketsMinted = value.div(expectedMinAmountInWei);
-            expectedNumTicketsPlayer1 = players[0].expectedNumTickets.add(
-              expectedNumTicketsMinted
-            );
+            const expectedNumTicketsPlayer1: BigNumber =
+              players[0].expectedNumTickets.add(expectedNumTicketsMinted);
             expectedNumTotalTicketsMinted = expectedNumTotalTicketsMinted.add(
               expectedNumTicketsMinted
             );
 
             // check emitted event - player addr added / num lotto tickets granted
-            const { player, numTicketsMinted } = { ...receipt.events[0].args };
-            expect(player).to.be.equal(addrs[0].address);
-            expect(numTicketsMinted).to.be.equal(expectedNumTicketsMinted);
+            const event = {
+              ...receipt.events![0].args,
+            };
+            expect(event.player).to.be.equal(addrs[0].address);
+            expect(event.numTicketsMinted).to.be.equal(
+              expectedNumTicketsMinted
+            );
 
             expect(await LotteryContract.listOfPlayers(0)).to.be.equal(
               addrs[0].address
@@ -291,6 +354,11 @@ describe("Lottery contract", function () {
                 players[0].addr.address
               );
             });
+            it("should not allow lottery drawing to be triggered while minting is open", async function () {
+              await expect(
+                LotteryContract.triggerLotteryDrawing()
+              ).to.be.revertedWith("Lottery__MintingNotCompleted");
+            });
             it("*Happy Path: Should trigger lottery drawing", async function () {
               await LotteryContract.connect(owner).setLotteryInactive();
               const lottery = {
@@ -301,7 +369,7 @@ describe("Lottery contract", function () {
               const winningTicket = await LotteryContract.winningTicket();
 
               let ticketDistribution = await Promise.all(
-                players.map(async (player, ind) => {
+                players.map(async (player: SignerWithAddress, ind: number) => {
                   return await LotteryContract.getTicketDistribution(ind);
                 })
               );
@@ -346,7 +414,7 @@ describe("Lottery contract", function () {
                 );
               });
               describe("...After winning address found", function () {
-                let winningTicketFull;
+                let winningTicketFull: any;
                 beforeEach(async function () {
                   const winningTicket = await LotteryContract.winningTicket();
                   const winningTicketIndex = winningTicket.winningTicketIndex;
@@ -373,8 +441,10 @@ describe("Lottery contract", function () {
                   ).to.be.equal(expectedWinnings);
                 });
                 describe("...After deposit winnings", function () {
-                  let expectedWinnings, currentLotteryId, provider;
-                  const winnerBalance = {};
+                  let expectedWinnings: BigNumber,
+                    currentLotteryId: BigNumber,
+                    provider: MockProvider;
+                  const winnerBalance: any = {};
 
                   beforeEach(async function () {
                     provider = waffle.provider;
@@ -406,17 +476,19 @@ describe("Lottery contract", function () {
                     ).withdraw(currentLotteryId.toNumber());
                     const receipt = await tx.wait();
 
-                    const { winnerAddress, withdrawalAmount } = {
-                      ...receipt.events[0].args,
+                    const event = {
+                      ...receipt.events![0].args,
                     };
 
-                    expect(winnerAddress).to.be.equal(
+                    expect(event.winnerAddress).to.be.equal(
                       expectedWinningAddr.address
                     );
-                    expect(pendingWithdrawal).to.be.equal(withdrawalAmount);
+                    expect(pendingWithdrawal).to.be.equal(
+                      event.withdrawalAmount
+                    );
 
                     winnerBalance.final = await provider.getBalance(
-                      winnerAddress
+                      event.winnerAddress
                     );
 
                     const winningsWithdrawnSuccessfully =
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..2f0ba90
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "es2018",
+    "module": "commonjs",
+    "strict": true,
+    "esModuleInterop": true,
+    "outDir": "dist",
+    "declaration": true,
+    "resolveJsonModule": true
+  },
+  "include": ["./scripts", "./test", "./typechain-types"],
+  "files": ["./hardhat.config.ts"]
+}