tsconfig.json

{
  "compilerOptions": {
    "module": "commonjs",
    "target": "es6",

    "removeComments": true,
    "preserveConstEnums": true,

    "rootDir": ".",
    "outDir": "lib",
    "sourceMap": true,
    "declaration": true,
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,

    "forceConsistentCasingInFileNames": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noImplicitUseStrict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "strictBindCallApply": true,
    "strictFunctionTypes": true,
    "strictNullChecks": true,
    "strictPropertyInitialization": true,
    "suppressImplicitAnyIndexErrors": true
  },
  "include": [
    "spec/**/*.ts",
    "src/**/*.ts"
  ],
  "exclude": [
    "lib",
    "node_modules"
  ]
}