app/tsconfig.json

{
  "compilerOptions": {
    "target": "ES2015",
    "module": "esnext",
    "moduleResolution": "node",
    "lib": ["es2015", "dom"],
    "allowSyntheticDefaultImports": true,
    "skipLibCheck": true,
    "sourceMap": true,
    "rootDir": "./src",
    "outDir": "./dist",
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": true,
    "noImplicitThis": true,
    "alwaysStrict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "esModuleInterop": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true
  },
  "include": ["src/**/*.ts"],
  "exclude": ["node_modules", "dist"]
}