Feat: Support macOS and Windows, migrate JavaScript to TypeScript (#32)

- Support macOS and Windows (Close #24 )
- Refactoring
  - Error handling
  - TypeScript
- Prettier (Close #29 )
- GHA: Add upload-artifact step for test coverage
- deps: Install husky

lib/get-url.js

@@ -0,0 +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;
+}
+exports.default = getURL;