onion-core/tsconfig.json

{
  "compilerOptions": {
    "types": ["mocha", "node", "react"],
    "target": "es6",
    "jsx": "react",
    "sourceMap": true,
    "noImplicitThis": true,
    "strictBindCallApply": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "alwaysStrict": true,
    "moduleResolution": "nodenext",
  }
}