tsconfig.json

{
  // Most ts-node options can be specified here using their programmatic names.
  "ts-node": {
    // It is faster to skip typechecking.
    // Remove if you want ts-node to do typechecking.
    "transpileOnly": true,
    "files": true,
    "compilerOptions": {
      // compilerOptions specified here will override those declared below,
      // but *only* in ts-node.  Useful if you want ts-node and tsc to use
      // different options with a single tsconfig.json.
    }
  },
  "grats": {
    "nullableByDefault": false
  },
  "compilerOptions": {
    "skipLibCheck": true,
    "lib": ["es2017"],
    // typescript options here
    "experimentalDecorators": true,
    "outDir": "dist",
    "downlevelIteration": true,
    "strictNullChecks": true,
    "declaration": true,
    "resolveJsonModule": true,
    "strictPropertyInitialization": true
  },
  "exclude": [
    "node_modules",
    "dist",
    "src/tests/fixtures",
    "docs",
    "examples",
    "website",
    "grats-ts-plugin"
  ]
}