tsconfig.json

{
  "include": ["src", "types"],
  "exclude": ["/node_modules/", "./src/**/*.spec.ts"],
  "compilerOptions": {
    "allowSyntheticDefaultImports": true,
    "alwaysStrict": true,
    "baseUrl": "./",
    "declaration": true,
    "esModuleInterop": true,
    "lib": ["es2015", "es2016", "es2017", "dom"],
    "module": "commonjs",
    "moduleResolution": "node",
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noUnusedLocals": false,
    "noUnusedParameters": true,
    "outDir": "dist",
    "rootDir": "src",
    "sourceMap": true,
    "strict": true,
    "strictFunctionTypes": true,
    "strictNullChecks": true,
    "strictPropertyInitialization": true,
    "target": "es5",
    "paths": {
      "*": ["src/*"]
    }
  }
}