tsconfig.json

{
  "compilerOptions": {
    "allowJs": false,
    "module": "commonjs",
    "noImplicitAny": true,
    "removeComments": true,
    "preserveConstEnums": false,
    "target": "ES2015",
    "lib": [
      "es6",
      "dom"
    ],
    "moduleResolution": "node",
    "experimentalDecorators": true,
    "noEmitOnError": true,
    "allowUnreachableCode": false,
    "downlevelIteration": true,
    "locale": "en-us",
    "noFallthroughCasesInSwitch": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "strict": true,
    "strictNullChecks": true,
    "stripInternal": true,
    "suppressImplicitAnyIndexErrors": true,
    "outDir": "./build",
    "typeRoots": [
      "custom-typings",
      "./node_modules/@types"
    ]
  },
  "include": [
    "./src/**/*.ts",
    "./test/**/*.ts",
    "./custom-typings/index"
  ]
}