tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "moduleResolution": "node",
    "allowJs": false,
    "declaration": true,
    "noImplicitAny": true,
    "removeComments": true,
    "noLib": false,
    "allowSyntheticDefaultImports": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "sourceMap": false,
    "importHelpers": true,
    "alwaysStrict": true,
    "strictNullChecks": true,
    "outDir": "./lib",
    "baseUrl": "./src",
    "rootDir": "src",
    "watch": false,
    "noEmitOnError": true,
    "forceConsistentCasingInFileNames": true,
    "allowUnreachableCode": false,
    "allowUnusedLabels": false,
    "noUnusedParameters": false,
    "noUnusedLocals": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitReturns": true,
    "pretty": true,
    "lib": ["es6", "dom", "esnext"],
    "types": ["reflect-metadata"],
    "skipLibCheck": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "**/*.spec.ts"],
  "typeRoots": ["src/types", "node_modules/@types"]
}