tsconfig.json

{
  /* Visit https://aka.ms/tsconfig.json to read more about this file */
  "compilerOptions": {
    /* Basic Options */
    "target": "es2017",
    "module": "esnext",
    "declaration": true,
    "sourceMap": true,
    "outDir": "./dist",
    "rootDir": "./src",
    "removeComments": true,
    "importHelpers": true,
    "downlevelIteration": true,
    // "isolatedModules": true,

    /* Strict Type-Checking Options */
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictPropertyInitialization": true,
    "noImplicitThis": true,
    "alwaysStrict": true,

    /* Additional Checks */
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,

    /* Module Resolution Options */
    "moduleResolution": "node",
    // "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,

    /* Advanced Options */
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "src/**/*.spec.ts"]
}