tsconfig.json

{
  "compilerOptions": {
    "rootDir": ".",
    "module": "ESNext",
    "target": "ES2015",
    "lib": ["dom", "ES2015"],
    "sourceMap": true,
    "allowJs": true,
    "jsx": "react",
    "outDir": "./app",
    "moduleResolution": "node",
    "forceConsistentCasingInFileNames": true,
    // "noEmit": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noImplicitAny": true,
		// "strictNullChecks": true,
    "suppressImplicitAnyIndexErrors": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "esModuleInterop": true,
    "resolveJsonModule": true
  },
  "include": ["src", "package.json"],
  "exclude": ["app", "node_modules", "src/**/*.spec.ts"]
}