tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "lib": ["es6", "es2015", "dom"],
    "declaration": true,
    "strict": true,
    "types": ["node"],
    "esModuleInterop": true,
    "resolveJsonModule": true,

    "outDir": "lib",
    "rootDirs": ["src"],

    /* Strict Type-Checking Options */
    /* Raise error on expressions and declarations with an implied 'any' type. */
    "noImplicitAny": true,
    /* Enable strict null checks. */
    "strictNullChecks": true,
    /* Enable strict checking of function types. */
    "strictFunctionTypes": true,
    /* Enable strict checking of property initialization in classes. */
    "strictPropertyInitialization": true,
    /* Raise error on 'this' expressions with an implied 'any' type. */
    "noImplicitThis": true,
    /* Parse in strict mode and emit "use strict" for each source file. */
    "alwaysStrict": true,

    /* Additional Checks */
    /* Report error when not all code paths in function return a value. */
    "noImplicitReturns": true,
    /* Report errors for fallthrough cases in switch statement. */
    "noFallthroughCasesInSwitch": true,

    /* Debugging Options */
    /* Report module resolution log messages. */
    "traceResolution": false,
    /* Print names of generated files part of the compilation. */
    "listEmittedFiles": false,
    /* Print names of files part of the compilation. */
    "listFiles": false,
    /* Stylize errors and messages using color and context. */
    "pretty": true
  },
  "exclude": [
    "bin",
    "lib",
    "node_modules",
    "src/**/*.spec.ts"
  ],
  "include": [
    "src"
  ]
}