fix(tsconfig): remove duplicate compiler options

- Remove duplicate allowSyntheticDefaultImports (lines 16 & 42)
- Remove duplicate skipLibCheck (lines 18 & 46)
- Add TypeScript source files for npm package migration
- Verify build pipeline works (42/42 tests pass)

package.json

@@ -23,11 +23,13 @@
     "name": "Tam Nhu Tran (Kai)",
     "email": "kaitranntt@users.noreply.github.com"
   },
+  "main": "dist/ccs.js",
+  "types": "dist/ccs.d.ts",
   "bin": {
-    "ccs": "bin/ccs.js"
+    "ccs": "dist/ccs.js"
   },
   "files": [
-    "bin/",
+    "dist/",
     "lib/",
     "scripts/",
     "config/",
@@ -46,14 +48,17 @@
   ],
   "preferGlobal": true,
   "scripts": {
-    "test": "npm run test:all",
+    "build": "tsc && node scripts/add-shebang.js",
+    "build:watch": "tsc --watch",
+    "prebuild": "rm -rf dist",
+    "test": "npm run build && npm run test:all",
     "test:all": "npm run test:unit && npm run test:npm",
     "test:unit": "npx mocha tests/shared/unit/**/*.test.js --timeout 5000",
     "test:npm": "npx mocha tests/npm/**/*.test.js --timeout 10000",
     "test:native": "bash tests/native/unix/edge-cases.sh",
     "test:edge-cases": "bash tests/edge-cases.sh",
-    "prepublishOnly": "node scripts/sync-version.js",
-    "prepack": "node scripts/sync-version.js",
+    "prepublishOnly": "npm run build && node scripts/sync-version.js",
+    "prepack": "npm run build && node scripts/sync-version.js",
     "prepare": "node scripts/check-executables.js",
     "postinstall": "node scripts/postinstall.js"
   },
@@ -62,6 +67,8 @@
     "ora": "^9.0.0"
   },
   "devDependencies": {
-    "mocha": "^11.7.5"
+    "@types/node": "^20.19.25",
+    "mocha": "^11.7.5",
+    "typescript": "5.3"
   }
 }