tsconfig.json

{
  "compilerOptions": {
    "sourceMap": true,
    "target": "es6",
    "module": "commonjs",
    "lib": [
      "es6",
      "dom"
    ], /* Specify library files to be included in the compilation. */
    "allowJs": true, /* Concatenate and emit output to single file. */
    "outDir": "build", /* Redirect output structure to the directory. */
    "rootDir": "src", /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    /* Strict Type-Checking Options */
    "strict": true, /* Enable all strict type-checking options. */
    "noImplicitAny": true, /* Raise error on expressions and declarations with an implied 'any' type. */
    "strictNullChecks": true,
    "suppressImplicitAnyIndexErrors": true, /* Enable strict null checks. */
    "noImplicitThis": true, /* Raise error on 'this' expressions with an implied 'any' type. */
    /* Module Resolution Options */
    "moduleResolution": "node", /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
    "esModuleInterop": true, /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
    "resolveJsonModule": true /* Include modules imported with '.json' extension */
  },
  "include": [
    "src/**/*.ts",
  ]
}