diff --git a/.eslintrc.json b/.eslintrc.json
index d097bf7..f8f61db 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,17 +1,19 @@
 {
-    "env": {
-        "commonjs": true,
-        "es6": true,
-        "node": true
-    },
-    "extends": "eslint:recommended",
-    "globals": {
-        "Atomics": "readonly",
-        "SharedArrayBuffer": "readonly"
-    },
-    "parserOptions": {
-        "ecmaVersion": 2018
-    },
-    "rules": {
-    }
-}
\ No newline at end of file
+  "env": {
+    "commonjs": true,
+    "es6": true,
+    "node": true
+  },
+  "extends": "eslint:recommended",
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "sourceType": "module",
+    "ecmaVersion": 2019
+  },
+  "rules": {
+  }
+}
diff --git a/__tests__/get-os.test.js b/__tests__/get-os.test.ts
similarity index 91%
rename from __tests__/get-os.test.js
rename to __tests__/get-os.test.ts
index c278d84..dff6d0c 100644
--- a/__tests__/get-os.test.js
+++ b/__tests__/get-os.test.ts
@@ -1,4 +1,4 @@
-const getOS = require("../lib/get-os");
+import getOS from "../src/get-os";
 
 describe("getOS", () => {
   test("test", () => {
diff --git a/__tests__/get-url.test.js b/__tests__/get-url.test.ts
similarity index 95%
rename from __tests__/get-url.test.js
rename to __tests__/get-url.test.ts
index fa2c1d1..e07ccb2 100644
--- a/__tests__/get-url.test.js
+++ b/__tests__/get-url.test.ts
@@ -1,4 +1,4 @@
-const getURL = require("../lib/get-url");
+import getURL from "../src/get-url";
 
 describe("getURL()", () => {
   test("test", () => {
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..563d4cc
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,11 @@
+module.exports = {
+  clearMocks: true,
+  moduleFileExtensions: ['js', 'ts'],
+  testEnvironment: 'node',
+  testMatch: ['**/*.test.ts'],
+  testRunner: 'jest-circus/runner',
+  transform: {
+    '^.+\\.ts$': 'ts-jest'
+  },
+  verbose: true
+}
\ No newline at end of file
diff --git a/lib/get-latest-version.js b/lib/get-latest-version.js
index e3bdcd3..9d2f85d 100644
--- a/lib/get-latest-version.js
+++ b/lib/get-latest-version.js
@@ -1,21 +1,22 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
 const XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;
-
 function getLatestVersion() {
-  return new Promise((resolve, reject) => {
-    const xhr = new XMLHttpRequest();
-    const url = "https://formulae.brew.sh/api/formula/hugo.json";
-    xhr.open("GET", url);
-    xhr.send();
-    xhr.onreadystatechange = function() {
-      if (xhr.readyState === 4 && xhr.status === 200) {
-        const result = JSON.parse(xhr.responseText);
-        const latestVersion = result.versions.stable;
-        resolve(latestVersion);
-      } else if (xhr.readyState === 4 && xhr.status !== 200) {
-        reject(`ERROR: got status ${xhr.status} of ${url}`);
-      }
-    };
-  });
+    return new Promise((resolve, reject) => {
+        const xhr = new XMLHttpRequest();
+        const url = "https://formulae.brew.sh/api/formula/hugo.json";
+        xhr.open("GET", url);
+        xhr.send();
+        xhr.onreadystatechange = function () {
+            if (xhr.readyState === 4 && xhr.status === 200) {
+                const result = JSON.parse(xhr.responseText);
+                const latestVersion = result.versions.stable;
+                resolve(latestVersion);
+            }
+            else if (xhr.readyState === 4 && xhr.status !== 200) {
+                reject(`ERROR: got status ${xhr.status} of ${url}`);
+            }
+        };
+    });
 }
-
-module.exports = getLatestVersion;
+exports.default = getLatestVersion;
diff --git a/lib/get-os.js b/lib/get-os.js
index 3fa37a4..03e37ed 100644
--- a/lib/get-os.js
+++ b/lib/get-os.js
@@ -1,14 +1,18 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
 function getOS(platform) {
-  if (platform === "linux") {
-    return "Linux";
-  } else if (platform === "darwin") {
-    return "macOS";
-  } else if (platform === "win32") {
-    return "Windows";
-    // throw new Error("Windows is not supported");
-  } else {
-    throw new Error(`${platform} is not supported`);
-  }
+    if (platform === "linux") {
+        return "Linux";
+    }
+    else if (platform === "darwin") {
+        return "macOS";
+    }
+    else if (platform === "win32") {
+        return "Windows";
+        // throw new Error("Windows is not supported");
+    }
+    else {
+        throw new Error(`${platform} is not supported`);
+    }
 }
-
-module.exports = getOS;
+exports.default = getOS;
diff --git a/lib/get-url.js b/lib/get-url.js
index 20a0c56..f033277 100644
--- a/lib/get-url.js
+++ b/lib/get-url.js
@@ -1,27 +1,27 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
 function getURL(os, extended, version) {
-  const extendedStr = extended => {
-    if (extended === "true") {
-      return "extended_";
-    } else {
-      return "";
-    // } else {
-    //   throw new Error(`Invalid input (extended): ${extended}`);
-    }
-  };
-
-  const ext = os => {
-    if (os === "Windows") {
-      return "zip";
-    } else {
-      return "tar.gz";
-    }
-  };
-
-  const hugoName = `hugo_${extendedStr(extended)}${version}_${os}-64bit`;
-  const baseURL = "https://github.com/gohugoio/hugo/releases/download";
-  const url = `${baseURL}/v${version}/${hugoName}.${ext(os)}`;
-
-  return url;
+    const extendedStr = (extended) => {
+        if (extended === "true") {
+            return "extended_";
+        }
+        else {
+            return "";
+            // } else {
+            //   throw new Error(`Invalid input (extended): ${extended}`);
+        }
+    };
+    const ext = (os) => {
+        if (os === "Windows") {
+            return "zip";
+        }
+        else {
+            return "tar.gz";
+        }
+    };
+    const hugoName = `hugo_${extendedStr(extended)}${version}_${os}-64bit`;
+    const baseURL = "https://github.com/gohugoio/hugo/releases/download";
+    const url = `${baseURL}/v${version}/${hugoName}.${ext(os)}`;
+    return url;
 }
-
-module.exports = getURL;
+exports.default = getURL;
diff --git a/lib/index.js b/lib/index.js
index 4aa7ea1..8174acd 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,33 +1,57 @@
-const core = require("@actions/core");
-const exec = require("@actions/exec");
-const getLatestVersion = require("./get-latest-version");
-const installer = require("./installer");
-
+"use strict";
+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
+    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
+    return new (P || (P = Promise))(function (resolve, reject) {
+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
+        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
+    });
+};
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const core = __importStar(require("@actions/core"));
+const exec = __importStar(require("@actions/exec"));
+const get_latest_version_1 = __importDefault(require("./get-latest-version"));
+const installer_1 = __importDefault(require("./installer"));
 // most @actions toolkit packages have async methods
-async function run() {
-  try {
-    getLatestVersion().then(
-      async function(latestVersion) {
-        let hugoVersion = core.getInput("hugo-version");
-        if (!hugoVersion || hugoVersion === "latest") {
-          hugoVersion = latestVersion;
+function run() {
+    return __awaiter(this, void 0, void 0, function* () {
+        try {
+            get_latest_version_1.default().then(function (latestVersion) {
+                return __awaiter(this, void 0, void 0, function* () {
+                    const hugoVersion = core.getInput("hugo-version");
+                    console.log(`Hugo version: ${hugoVersion}`);
+                    const version = (v, latestVersion) => {
+                        if (v === "" || v === "latest") {
+                            return latestVersion;
+                        }
+                        else {
+                            return v;
+                        }
+                    };
+                    yield installer_1.default(version(hugoVersion, latestVersion));
+                    // Show version
+                    yield exec.exec("hugo version");
+                    yield exec.exec("go version");
+                    yield exec.exec("git --version");
+                });
+            }, function (error) {
+                core.setFailed(error);
+            });
         }
-        console.log(`Hugo version: ${hugoVersion}`);
-
-        await installer(hugoVersion);
-
-        // Show version
-        await exec.exec("hugo version");
-        await exec.exec("go version");
-        await exec.exec("git --version");
-      },
-      function(error) {
-        core.setFailed(error);
-      }
-    );
-  } catch (error) {
-    core.setFailed(error.message);
-  }
+        catch (error) {
+            core.setFailed(error.message);
+        }
+    });
 }
-
 run();
diff --git a/lib/installer.js b/lib/installer.js
index bb22949..59a573a 100644
--- a/lib/installer.js
+++ b/lib/installer.js
@@ -1,38 +1,57 @@
-const core = require("@actions/core");
-const tc = require("@actions/tool-cache");
-const io = require("@actions/io");
-const getOS = require("./get-os");
-const getURL = require("./get-url");
-
-async function installer(version) {
-  try {
-    const extended = core.getInput("extended");
-    console.log(`Hugo extended: ${extended}`);
-
-    const osName = getOS(process.platform);
-    console.log(`Operating System: ${osName}`);
-
-    const hugoURL = getURL(osName, extended, version);
-    core.debug(`hugoURL: ${hugoURL}`);
-
-    const hugoPath = `${process.env.HOME}/bin`;
-    await io.mkdirP(hugoPath);
-    core.addPath(hugoPath);
-
-    // Download and extract Hugo binary
-    const hugoAssets = await tc.downloadTool(hugoURL);
-    let hugoBin = "";
-    if (osName === "Windows") {
-      const hugoExtractedFolder = await tc.extractZip(hugoAssets, "/tmp");
-      hugoBin = `${hugoExtractedFolder}/hugo.exe`;
-    } else {
-      const hugoExtractedFolder = await tc.extractTar(hugoAssets, "/tmp");
-      hugoBin = `${hugoExtractedFolder}/hugo`;
-    }
-    await io.mv(hugoBin, hugoPath);
-  } catch (error) {
-    core.setFailed(error.message);
-  }
+"use strict";
+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
+    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
+    return new (P || (P = Promise))(function (resolve, reject) {
+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
+        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
+    });
+};
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const core = __importStar(require("@actions/core"));
+const tc = __importStar(require("@actions/tool-cache"));
+const io = __importStar(require("@actions/io"));
+const get_os_1 = __importDefault(require("./get-os"));
+const get_url_1 = __importDefault(require("./get-url"));
+function installer(version) {
+    return __awaiter(this, void 0, void 0, function* () {
+        try {
+            const extended = core.getInput("extended");
+            console.log(`Hugo extended: ${extended}`);
+            const osName = get_os_1.default(process.platform);
+            console.log(`Operating System: ${osName}`);
+            const hugoURL = get_url_1.default(osName, extended, version);
+            core.debug(`hugoURL: ${hugoURL}`);
+            const hugoPath = `${process.env.HOME}/bin`;
+            yield io.mkdirP(hugoPath);
+            core.addPath(hugoPath);
+            // Download and extract Hugo binary
+            const hugoAssets = yield tc.downloadTool(hugoURL);
+            let hugoBin = "";
+            if (osName === "Windows") {
+                const hugoExtractedFolder = yield tc.extractZip(hugoAssets, "/tmp");
+                hugoBin = `${hugoExtractedFolder}/hugo.exe`;
+            }
+            else {
+                const hugoExtractedFolder = yield tc.extractTar(hugoAssets, "/tmp");
+                hugoBin = `${hugoExtractedFolder}/hugo`;
+            }
+            yield io.mv(hugoBin, hugoPath);
+        }
+        catch (error) {
+            core.setFailed(error.message);
+        }
+    });
 }
-
-module.exports = installer;
+exports.default = installer;
diff --git a/package-lock.json b/package-lock.json
index 6ce03ef..7817dbd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -461,6 +461,12 @@
         "@babel/types": "^7.3.0"
       }
     },
+    "@types/eslint-visitor-keys": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
+      "integrity": "sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==",
+      "dev": true
+    },
     "@types/istanbul-lib-coverage": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.1.tgz",
@@ -486,6 +492,33 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "@types/jest": {
+      "version": "24.0.18",
+      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-24.0.18.tgz",
+      "integrity": "sha512-jcDDXdjTcrQzdN06+TSVsPPqxvsZA/5QkYfIZlq1JMw7FdP5AZylbOc+6B/cuDurctRe+MziUMtQ3xQdrbjqyQ==",
+      "dev": true,
+      "requires": {
+        "@types/jest-diff": "*"
+      }
+    },
+    "@types/jest-diff": {
+      "version": "20.0.1",
+      "resolved": "https://registry.npmjs.org/@types/jest-diff/-/jest-diff-20.0.1.tgz",
+      "integrity": "sha512-yALhelO3i0hqZwhjtcr6dYyaLoCHbAMshwtj6cGxTvHZAKXHsYGdff6E8EPw3xLKY0ELUTQ69Q1rQiJENnccMA==",
+      "dev": true
+    },
+    "@types/json-schema": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.3.tgz",
+      "integrity": "sha512-Il2DtDVRGDcqjDtE+rF8iqg1CArehSK84HZJCT7AMITlyXRBpuPhqGLDQMowraqqu1coEaimg4ZOqggt6L6L+A==",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "12.7.5",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.7.5.tgz",
+      "integrity": "sha512-9fq4jZVhPNW8r+UYKnxF1e2HkDWOWKM5bC2/7c9wPV835I0aOrVbS/Hw/pWPk2uKrNXQqg9Z959Kz+IYDd5p3w==",
+      "dev": true
+    },
     "@types/stack-utils": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@types/stack-utils/-/stack-utils-1.0.1.tgz",
@@ -507,6 +540,49 @@
       "integrity": "sha512-gCubfBUZ6KxzoibJ+SCUc/57Ms1jz5NjHe4+dI2krNmU5zCPAphyLJYyTOg06ueIyfj+SaCUqmzun7ImlxDcKg==",
       "dev": true
     },
+    "@typescript-eslint/experimental-utils": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/experimental-utils/-/experimental-utils-2.3.0.tgz",
+      "integrity": "sha512-ry+fgd0Hh33LyzS30bIhX/a1HJpvtnecjQjWxxsZTavrRa1ymdmX7tz+7lPrPAxB018jnNzwNtog6s3OhxPTAg==",
+      "dev": true,
+      "requires": {
+        "@types/json-schema": "^7.0.3",
+        "@typescript-eslint/typescript-estree": "2.3.0",
+        "eslint-scope": "^5.0.0"
+      }
+    },
+    "@typescript-eslint/parser": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/parser/-/parser-2.3.0.tgz",
+      "integrity": "sha512-Dc+LAtHts0yDuusxG0NVjGvrpPy2kZauxqPbfFs0fmcMB4JhNs+WwIDMFGWeKjbGoPt/SIUC9XJ7E0ZD/f8InQ==",
+      "dev": true,
+      "requires": {
+        "@types/eslint-visitor-keys": "^1.0.0",
+        "@typescript-eslint/experimental-utils": "2.3.0",
+        "@typescript-eslint/typescript-estree": "2.3.0",
+        "eslint-visitor-keys": "^1.1.0"
+      }
+    },
+    "@typescript-eslint/typescript-estree": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@typescript-eslint/typescript-estree/-/typescript-estree-2.3.0.tgz",
+      "integrity": "sha512-WBxfwsTeCOsmQ7cLjow7lgysviBKUW34npShu7dxJYUQCbSG5nfZWZTgmQPKEc+3flpbSM7tjXjQOgETYp+njQ==",
+      "dev": true,
+      "requires": {
+        "glob": "^7.1.4",
+        "is-glob": "^4.0.1",
+        "lodash.unescape": "4.0.1",
+        "semver": "^6.3.0"
+      },
+      "dependencies": {
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        }
+      }
+    },
     "abab": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.1.tgz",
@@ -866,6 +942,15 @@
         }
       }
     },
+    "bs-logger": {
+      "version": "0.2.6",
+      "resolved": "https://registry.npmjs.org/bs-logger/-/bs-logger-0.2.6.tgz",
+      "integrity": "sha512-pd8DCoxmbgc7hyPKOvxtqNcjYoOsABPQdcCUjGp3d42VR2CX1ORhk2A87oqqu5R1kk+76nsxZupkmyd+MVtCog==",
+      "dev": true,
+      "requires": {
+        "fast-json-stable-stringify": "2.x"
+      }
+    },
     "bser": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/bser/-/bser-2.1.0.tgz",
@@ -3031,6 +3116,30 @@
         "throat": "^4.0.0"
       }
     },
+    "jest-circus": {
+      "version": "24.9.0",
+      "resolved": "https://registry.npmjs.org/jest-circus/-/jest-circus-24.9.0.tgz",
+      "integrity": "sha512-dwkvwFtRc9Anmk1XTc+bonVL8rVMZ3CeGMoFWmv1oaQThdAgvfI9bwaFlZp+gLVphNVz6ZLfCWo3ERhS5CeVvA==",
+      "dev": true,
+      "requires": {
+        "@babel/traverse": "^7.1.0",
+        "@jest/environment": "^24.9.0",
+        "@jest/test-result": "^24.9.0",
+        "@jest/types": "^24.9.0",
+        "chalk": "^2.0.1",
+        "co": "^4.6.0",
+        "expect": "^24.9.0",
+        "is-generator-fn": "^2.0.0",
+        "jest-each": "^24.9.0",
+        "jest-matcher-utils": "^24.9.0",
+        "jest-message-util": "^24.9.0",
+        "jest-snapshot": "^24.9.0",
+        "jest-util": "^24.9.0",
+        "pretty-format": "^24.9.0",
+        "stack-utils": "^1.0.1",
+        "throat": "^4.0.0"
+      }
+    },
     "jest-config": {
       "version": "24.9.0",
       "resolved": "https://registry.npmjs.org/jest-config/-/jest-config-24.9.0.tgz",
@@ -3596,12 +3705,24 @@
       "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
       "dev": true
     },
+    "lodash.memoize": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/lodash.memoize/-/lodash.memoize-4.1.2.tgz",
+      "integrity": "sha1-vMbEmkKihA7Zl/Mj6tpezRguC/4=",
+      "dev": true
+    },
     "lodash.sortby": {
       "version": "4.7.0",
       "resolved": "https://registry.npmjs.org/lodash.sortby/-/lodash.sortby-4.7.0.tgz",
       "integrity": "sha1-7dFMgk4sycHgsKG0K7UhBRakJDg=",
       "dev": true
     },
+    "lodash.unescape": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/lodash.unescape/-/lodash.unescape-4.0.1.tgz",
+      "integrity": "sha1-vyJJiGzlFM2hEvrpIYzcBlIR/Jw=",
+      "dev": true
+    },
     "loose-envify": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/loose-envify/-/loose-envify-1.4.0.tgz",
@@ -3629,6 +3750,12 @@
         }
       }
     },
+    "make-error": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/make-error/-/make-error-1.3.5.tgz",
+      "integrity": "sha512-c3sIjNUow0+8swNwVpqoH4YCShKNFkMaw6oH1mNS2haDZQqkeZFlHS3dhoeEbKKmJB4vXpJucU6oH75aDYeE9g==",
+      "dev": true
+    },
     "makeerror": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/makeerror/-/makeerror-1.0.11.tgz",
@@ -5056,6 +5183,41 @@
       "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
       "dev": true
     },
+    "ts-jest": {
+      "version": "24.1.0",
+      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-24.1.0.tgz",
+      "integrity": "sha512-HEGfrIEAZKfu1pkaxB9au17b1d9b56YZSqz5eCVE8mX68+5reOvlM93xGOzzCREIov9mdH7JBG+s0UyNAqr0tQ==",
+      "dev": true,
+      "requires": {
+        "bs-logger": "0.x",
+        "buffer-from": "1.x",
+        "fast-json-stable-stringify": "2.x",
+        "json5": "2.x",
+        "lodash.memoize": "4.x",
+        "make-error": "1.x",
+        "mkdirp": "0.x",
+        "resolve": "1.x",
+        "semver": "^5.5",
+        "yargs-parser": "10.x"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
+          "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
+          "dev": true
+        },
+        "yargs-parser": {
+          "version": "10.1.0",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-10.1.0.tgz",
+          "integrity": "sha512-VCIyR1wJoEBZUqk5PA+oOBF6ypbwh5aNB3I50guxAL/quggdfs4TtNHQrSazFA3fYZ+tEqfs0zIGlv0c/rgjbQ==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^4.1.0"
+          }
+        }
+      }
+    },
     "tslib": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
@@ -5100,6 +5262,12 @@
         "underscore": "1.8.3"
       }
     },
+    "typescript": {
+      "version": "3.6.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.3.tgz",
+      "integrity": "sha512-N7bceJL1CtRQ2RiG0AQME13ksR7DiuQh/QehubYcghzv20tnh+MQnQIuJddTmsbqYj+dztchykemz0zFzlvdQw==",
+      "dev": true
+    },
     "uglify-js": {
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
diff --git a/package.json b/package.json
index 14e603b..ee4bbb2 100644
--- a/package.json
+++ b/package.json
@@ -4,9 +4,13 @@
   "description": "Hugo setup action",
   "main": "lib/index.js",
   "scripts": {
-    "lint": "eslint ./lib/**/*",
+    "lint": "eslint ./src/**/*.ts",
+    "lint:fix": "eslint --fix ./src/**/*.ts",
     "test": "jest --coverage --verbose",
-    "build": "npm prune --production"
+    "build": "npm prune --production",
+    "tsc": "tsc",
+    "format": "prettier --write **/*.ts",
+    "format:check": "prettier --check **/*.ts"
   },
   "repository": {
     "type": "git",
@@ -32,7 +36,13 @@
     "xmlhttprequest": "^1.8.0"
   },
   "devDependencies": {
+    "@types/jest": "^24.0.18",
+    "@types/node": "^12.7.5",
+    "@typescript-eslint/parser": "^2.3.0",
     "eslint": "^6.4.0",
-    "jest": "^24.9.0"
+    "jest": "^24.9.0",
+    "jest-circus": "^24.9.0",
+    "ts-jest": "^24.1.0",
+    "typescript": "^3.6.3"
   }
 }
diff --git a/src/get-latest-version.ts b/src/get-latest-version.ts
new file mode 100644
index 0000000..b82fd0e
--- /dev/null
+++ b/src/get-latest-version.ts
@@ -0,0 +1,19 @@
+const XMLHttpRequest = require("xmlhttprequest").XMLHttpRequest;
+
+export default function getLatestVersion(): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const xhr = new XMLHttpRequest();
+    const url: string = "https://formulae.brew.sh/api/formula/hugo.json";
+    xhr.open("GET", url);
+    xhr.send();
+    xhr.onreadystatechange = function() {
+      if (xhr.readyState === 4 && xhr.status === 200) {
+        const result = JSON.parse(xhr.responseText);
+        const latestVersion: string = result.versions.stable;
+        resolve(latestVersion);
+      } else if (xhr.readyState === 4 && xhr.status !== 200) {
+        reject(`ERROR: got status ${xhr.status} of ${url}`);
+      }
+    };
+  });
+}
diff --git a/src/get-os.ts b/src/get-os.ts
new file mode 100644
index 0000000..08d77f1
--- /dev/null
+++ b/src/get-os.ts
@@ -0,0 +1,12 @@
+export default function getOS(platform: string) {
+  if (platform === "linux") {
+    return "Linux";
+  } else if (platform === "darwin") {
+    return "macOS";
+  } else if (platform === "win32") {
+    return "Windows";
+    // throw new Error("Windows is not supported");
+  } else {
+    throw new Error(`${platform} is not supported`);
+  }
+}
diff --git a/src/get-url.ts b/src/get-url.ts
new file mode 100644
index 0000000..62a5ba1
--- /dev/null
+++ b/src/get-url.ts
@@ -0,0 +1,31 @@
+export default function getURL(
+  os: string,
+  extended: string,
+  version: string
+): string {
+  const extendedStr = (extended: string) => {
+    if (extended === "true") {
+      return "extended_";
+    } else {
+      return "";
+      // } else {
+      //   throw new Error(`Invalid input (extended): ${extended}`);
+    }
+  };
+
+  const ext = (os: string) => {
+    if (os === "Windows") {
+      return "zip";
+    } else {
+      return "tar.gz";
+    }
+  };
+
+  const hugoName: string = `hugo_${extendedStr(
+    extended
+  )}${version}_${os}-64bit`;
+  const baseURL: string = "https://github.com/gohugoio/hugo/releases/download";
+  const url: string = `${baseURL}/v${version}/${hugoName}.${ext(os)}`;
+
+  return url;
+}
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..267ef4b
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,37 @@
+import * as core from "@actions/core";
+import * as exec from "@actions/exec";
+import getLatestVersion from "./get-latest-version";
+import installer from "./installer";
+
+// most @actions toolkit packages have async methods
+async function run() {
+  try {
+    getLatestVersion().then(
+      async function(latestVersion): Promise<any> {
+        const hugoVersion: string = core.getInput("hugo-version");
+        console.log(`Hugo version: ${hugoVersion}`);
+        const version = (v: string, latestVersion: string): string => {
+          if (v === "" || v === "latest") {
+            return latestVersion;
+          } else {
+            return v;
+          }
+        };
+
+        await installer(version(hugoVersion, latestVersion));
+
+        // Show version
+        await exec.exec("hugo version");
+        await exec.exec("go version");
+        await exec.exec("git --version");
+      },
+      function(error) {
+        core.setFailed(error);
+      }
+    );
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+run();
diff --git a/src/installer.ts b/src/installer.ts
new file mode 100644
index 0000000..e955db6
--- /dev/null
+++ b/src/installer.ts
@@ -0,0 +1,42 @@
+import * as core from "@actions/core";
+import * as tc from "@actions/tool-cache";
+import * as io from "@actions/io";
+import getOS from "./get-os";
+import getURL from "./get-url";
+
+export default async function installer(version: string) {
+  try {
+    const extended: string = core.getInput("extended");
+    console.log(`Hugo extended: ${extended}`);
+
+    const osName: string = getOS(process.platform);
+    console.log(`Operating System: ${osName}`);
+
+    const hugoURL: string = getURL(osName, extended, version);
+    core.debug(`hugoURL: ${hugoURL}`);
+
+    const hugoPath: string = `${process.env.HOME}/bin`;
+    await io.mkdirP(hugoPath);
+    core.addPath(hugoPath);
+
+    // Download and extract Hugo binary
+    const hugoAssets: string = await tc.downloadTool(hugoURL);
+    let hugoBin: string = "";
+    if (osName === "Windows") {
+      const hugoExtractedFolder: string = await tc.extractZip(
+        hugoAssets,
+        "/tmp"
+      );
+      hugoBin = `${hugoExtractedFolder}/hugo.exe`;
+    } else {
+      const hugoExtractedFolder: string = await tc.extractTar(
+        hugoAssets,
+        "/tmp"
+      );
+      hugoBin = `${hugoExtractedFolder}/hugo`;
+    }
+    await io.mv(hugoBin, hugoPath);
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..7e0f9c2
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,63 @@
+{
+  "compilerOptions": {
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "es6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "./lib",                        /* Redirect output structure to the directory. */
+    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    "noImplicitAny": true,                    /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+  },
+  "exclude": ["node_modules", "**/*.test.ts"]
+}