feat: simplify build configuration with unified Rollup setup and improved TypeScript

- Unified Rollup configuration: Single rollup.config.js instead of two files
- Improved TypeScript configuration: ES2020 target with better type inference
- Removed redundant type annotations leveraging TypeScript's inference
- Added ES module support with "type": "module" in package.json
- Simplified build scripts from 8 to 4 commands
- Modern TypeScript settings with declaration maps and better defaults

All 70 tests passing successfully with cleaner, more maintainable configuration.

Author: meabed

package.json

@@ -46,7 +46,7 @@
     "resources"
   ],
   "scripts": {
-    "build": "rm -rf lib && rolldown -c && yarn build:types",
+    "build": "rm -rf lib && rollup -c && yarn build:types",
     "build:types": "tsc --emitDeclarationOnly",
     "check": "biome check .",
     "format": "biome format --write .",
@@ -58,7 +58,7 @@
     "release": "semantic-release",
     "release:dry": "semantic-release --dry-run",
     "test": "NODE_OPTIONS='--experimental-vm-modules' jest",
-    "watch": "rm -rf lib && rolldown -c --watch"
+    "watch": "rm -rf lib && rollup -cw"
   },
   "config": {
     "commitizen": {
@@ -81,15 +81,21 @@
   },
   "devDependencies": {
     "@biomejs/biome": "^2.2.2",
+    "@rollup/plugin-commonjs": "^28.0.6",
+    "@rollup/plugin-json": "^6.1.0",
+    "@rollup/plugin-node-resolve": "^16.0.1",
+    "@rollup/plugin-terser": "^0.4.4",
     "@types/bson": "^4.2.4",
     "@types/jest": "^30.0.0",
     "@types/node": "^24.3.0",
     "@types/shelljs": "^0.8.17",
+    "esbuild": "^0.25.9",
     "husky": "^9.1.7",
     "jest": "^30.1.3",
     "lint-staged": "^16.1.6",
     "prettier": "^3.6.2",
-    "rolldown": "^1.0.0-beta.34",
+    "rollup": "^4.50.0",
+    "rollup-plugin-esbuild": "^6.2.1",
     "shelljs": "^0.10.0",
     "ts-jest": "^29.4.1",
     "tslib": "^2.8.1",

rollup.config.js

@@ -0,0 +1,129 @@
+import { readFileSync } from 'node:fs'
+import commonjs from '@rollup/plugin-commonjs'
+import json from '@rollup/plugin-json'
+import resolve from '@rollup/plugin-node-resolve'
+import terser from '@rollup/plugin-terser'
+import esbuild from 'rollup-plugin-esbuild'
+
+const pkg = JSON.parse(readFileSync('./package.json', 'utf-8'))
+
+// External dependencies for main build
+const external = [
+  ...Object.keys(pkg.dependencies || {}),
+  ...Object.keys(pkg.peerDependencies || {}),
+]
+
+// Base ESBuild config
+const esbuildBase = {
+  include: /\.ts$/,
+  exclude: /node_modules/,
+  sourceMap: false,
+  minify: false,
+  target: 'es2017',
+  tsconfig: './tsconfig.json',
+  loaders: {
+    '.ts': 'ts',
+  },
+}
+
+// Main library config (external dependencies)
+export const mainConfig = {
+  input: 'src/index.ts',
+  output: [
+    {
+      file: pkg.main,
+      format: 'cjs',
+    },
+    {
+      file: pkg.module,
+      format: 'es',
+    },
+  ],
+  external,
+  plugins: [esbuild(esbuildBase)],
+}
+
+// Serverless bundled config
+const serverlessPlugins = [
+  resolve({
+    preferBuiltins: false,
+    browser: true,
+  }),
+  commonjs(),
+  json(),
+  esbuild(esbuildBase),
+]
+
+export const serverlessConfig = [
+  // ESM build
+  {
+    input: 'src/index.serverless.ts',
+    output: {
+      file: 'lib/serverless.esm.js',
+      format: 'es',
+    },
+    plugins: serverlessPlugins,
+  },
+  // ESM minified
+  {
+    input: 'src/index.serverless.ts',
+    output: {
+      file: 'lib/serverless.esm.min.js',
+      format: 'es',
+    },
+    plugins: [
+      ...serverlessPlugins,
+      terser({
+        compress: {
+          drop_console: true,
+          passes: 2,
+        },
+        mangle: true,
+      }),
+    ],
+  },
+  // CommonJS build
+  {
+    input: 'src/index.serverless.ts',
+    output: {
+      file: 'lib/serverless.cjs.js',
+      format: 'cjs',
+      exports: 'named',
+    },
+    plugins: serverlessPlugins,
+  },
+  // UMD build for browsers
+  {
+    input: 'src/index.serverless.ts',
+    output: {
+      file: 'lib/serverless.umd.js',
+      format: 'umd',
+      name: 'PhoneNumberValidator',
+      exports: 'named',
+    },
+    plugins: serverlessPlugins,
+  },
+  // UMD minified
+  {
+    input: 'src/index.serverless.ts',
+    output: {
+      file: 'lib/serverless.umd.min.js',
+      format: 'umd',
+      name: 'PhoneNumberValidator',
+      exports: 'named',
+    },
+    plugins: [
+      ...serverlessPlugins,
+      terser({
+        compress: {
+          drop_console: true,
+          passes: 2,
+        },
+        mangle: true,
+      }),
+    ],
+  },
+]
+
+// Export all configs
+export default [mainConfig, ...serverlessConfig]

tsconfig.json

@@ -8,7 +8,7 @@
     "outDir": "./lib",
     "rootDir": "./src",
     "strict": true,
-    "moduleResolution": "bundler",
+    "moduleResolution": "node",
     "esModuleInterop": true,
     "skipLibCheck": true,
     "forceConsistentCasingInFileNames": true,