tsconfig.json

{
  "compilerOptions": {
    /* Basic Options */
    "target": "es6" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
    "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
    "lib": ["dom", "es2017", "esnext", "es6"] /* Specify library files to be included in the compilation. */,
    "allowJs": true, /* Allow javascript files to be compiled. */
    "sourceMap": true /* Generates corresponding '.map' file. */,
    "outDir": "build" /* Redirect output structure to the directory. */,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "rootDir": "lib" /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */,
    "declaration": true /* Generates corresponding '.d.ts' file. */,
    "sourceMap": true /* Generates corresponding '.map' file. */,

    /* Strict Type-Checking Options */
    "strict": true,
    "noImplicitAny": true,

    /* 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 */
  },
  "exclude": ["node_modules", "build"]
}