tsconfig.build.json

{
  "compilerOptions": {
    "strictNullChecks": true,
    "declaration": true,
    "module": "commonjs",
    "target": "es5",
    "lib": ["es6", "dom"],
    "sourceMap": true,
    "esModuleInterop": true,
    "newLine": "lf"
  },
  "exclude": ["node_modules", "dist"]
}