tsconfig.mjs.json

{
  "compilerOptions": {
    "target": "ES2017",
    "module": "ES2015",
    "lib": ["ES2017"],
    "declaration": true,
    "outDir": "./mjs",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true, 
    "forceConsistentCasingInFileNames": true
  },
  "include": [
    "ts/*.ts"
  ]
}