Fix TypeScript build and test errors for ES modules (#142)

* fix: resolve TypeScript build and test errors for ES modules

- Convert jest.config.js from CommonJS to ES module format
- Add cross-env for cross-platform NODE_OPTIONS support
- Import jest globals from @jest/globals in test files
- Replace require.main check with import.meta.url for ES modules
- Remove unnecessary type assertions flagged by ESLint

All 101 tests passing, build and lint successful.

* Update src/rules-compiler-typescript/package.json

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Jayson Knight <jayson.knight@jaysonknight.com>

---------

Signed-off-by: Jayson Knight <jayson.knight@jaysonknight.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: jaypatrick

src/rules-compiler-typescript/jest.config.js

@@ -1,15 +1,20 @@
 /** @type {import('jest').Config} */
-module.exports = {
-  preset: 'ts-jest',
+export default {
+  preset: 'ts-jest/presets/default-esm',
   testEnvironment: 'node',
+  extensionsToTreatAsEsm: ['.ts'],
   roots: ['<rootDir>/src'],
   testMatch: ['**/*.test.ts'],
   collectCoverageFrom: ['src/**/*.ts', '!src/**/*.test.ts', '!src/index.ts'],
   coverageDirectory: 'coverage',
   coverageReporters: ['text', 'lcov'],
+  moduleNameMapper: {
+    '^(\\.{1,2}/.*)\\.js$': '$1',
+  },
   transform: {
     '^.+\\.tsx?$': ['ts-jest', {
       tsconfig: 'tsconfig.test.json',
+      useESM: true,
     }],
   },
 };

src/rules-compiler-typescript/package-lock.json

@@ -22,8 +22,8 @@
     "compile:yaml": "node --import tsx src/cli.ts -c compiler-config.yaml",
     "compile:toml": "node --import tsx src/cli.ts -c compiler-config.toml",
     "lint": "eslint src/",
-    "test": "jest",
-    "test:coverage": "jest --coverage",
+    "test": "cross-env NODE_OPTIONS=--experimental-vm-modules jest",
+    "test:coverage": "cross-env NODE_OPTIONS=--experimental-vm-modules jest --coverage",
     "clean": "rm -rf dist",
     "bun:build": "bun build src/cli.ts --outdir dist --target node",
     "bun:start": "bun dist/cli.js",
@@ -47,6 +47,7 @@
   "devDependencies": {
     "@types/jest": "^29.5.14",
     "@types/node": "^22.15.0",
+    "cross-env": "^7.0.3",
     "eslint": "^9.28.0",
     "jest": "^29.7.0",
     "ts-jest": "^29.4.0",

src/rules-compiler-typescript/package.json

@@ -369,7 +369,7 @@ export async function main(args: string[] = process.argv.slice(2)): Promise<numb
   }
 }
 
-// Run if executed directly
-if (require.main === module) {
+// Run if executed directly (ES module check)
+if (import.meta.url === `file://${process.argv[1]}`) {
   void main().then((code) => process.exit(code));
 }