ts.config.json

{
    "compilerOptions": {
      "target": "ES6",
      "module": "ES6",
      "moduleResolution": "node",
      "declaration": true,
      "outDir": "./lib",
      "importHelpers": true,
      "strict": true,
      "noImplicitAny": true,
      "strictNullChecks": true,
      "strictFunctionTypes": true,
      "strictBindCallApply": true,
      "strictPropertyInitialization": true,
      "noImplicitThis": true,
      "alwaysStrict": true,
      "noUnusedLocals": true,
      "noUnusedParameters": true,
      "noImplicitReturns": true,
      "noFallthroughCasesInSwitch": true,
      "allowSyntheticDefaultImports": true,
      "esModuleInterop": true,
      "skipLibCheck": true,
      "forceConsistentCasingInFileNames": true,
      "typeRoots": [
        "./node_modules/@types",
        "./src/declaration.d.ts"
      ],
      "rootDir": "./src",
      "baseUrl": "."
    },
    "include": [
      "src"
    ],
    "exclude": [
      "node_modules",
      "**/__tests__/*"
    ]
  }