Set up Rollup build configuration for TypeScript

- Added rollup.config.js with three output formats:
  * CJS: cjs/UrlUtils.js (CommonJS for Node.js)
  * ESM: es/UrlUtils.js (ES Modules with sourcemap)
  * UMD: umd/url-utils.min.js (Browser bundle, minified)
- Added build scripts to package.json:
  * build: Compile TypeScript and generate type definitions
  * pretest: Build before running tests
  * prepare: Build before publish
- Updated files field to include build output directories

Author: vershwal

packages/url-utils/package.json

@@ -11,12 +11,19 @@
   "main": "index.js",
   "scripts": {
     "dev": "echo \"Implement me!\"",
+    "pretest": "yarn build",
     "test": "NODE_ENV=testing c8 --all --reporter text --reporter cobertura --reporter html mocha './test/**/*.test.js'",
+    "build": "rollup -c && tsc --declaration --emitDeclarationOnly --declarationDir ./types",
     "lint": "eslint . --ext .js --cache",
+    "prepare": "NODE_ENV=production yarn build",
     "posttest": "yarn lint"
   },
   "files": [
-    "lib/",
+    "src/",
+    "cjs/",
+    "es/",
+    "umd/",
+    "types/",
     "index.js"
   ],
   "publishConfig": {

packages/url-utils/rollup.config.js

@@ -0,0 +1,71 @@
+/* eslint-env node */
+import typescript from '@rollup/plugin-typescript';
+import commonjs from 'rollup-plugin-commonjs';
+import resolve from 'rollup-plugin-node-resolve';
+import json from '@rollup/plugin-json';
+import {terser} from 'rollup-plugin-terser';
+
+export default [
+    // Node build.
+    // No transpilation or bundling other than conversion from es modules to cjs
+    {
+        input: 'src/UrlUtils.ts',
+        output: {
+            file: 'cjs/UrlUtils.js',
+            format: 'cjs',
+            interop: false
+        },
+        plugins: [
+            typescript(),
+            commonjs({
+                include: ['node_modules/**', '../../node_modules/**']
+            })
+        ]
+    },
+
+    // ES module build
+    // Transpiles to es version supported by preset-env's default browsers list,
+    // bundles all necessary dependencies and polyfills
+    {
+        input: 'src/UrlUtils.ts',
+        output: [{
+            file: 'es/UrlUtils.js',
+            format: 'es',
+            sourcemap: true
+        }],
+        plugins: [
+            resolve({
+                browser: true
+            }),
+            json(),
+            typescript(),
+            commonjs({
+                include: ['node_modules/**', '../../node_modules/**']
+            })
+        ]
+    },
+
+    // Standalone UMD browser build (minified).
+    // Transpiles to es version supported by preset-env's default browsers list,
+    // bundles all dependencies and polyfills.
+    {
+        input: 'src/UrlUtils.ts',
+        output: {
+            file: 'umd/url-utils.min.js',
+            format: 'umd',
+            name: 'GhostUrlUtils',
+            sourcemap: true
+        },
+        plugins: [
+            resolve({
+                browser: true
+            }),
+            json(),
+            typescript(),
+            commonjs({
+                include: ['node_modules/**', '../../node_modules/**']
+            }),
+            terser()
+        ]
+    }
+];