tsconfig.json

{
  "compilerOptions": {
    "target": "ES2018",                       /* node10 */
    "module": "commonjs",
    "lib": [
      "es2015",
      "es2016",
      "es2017",
      "es2018",
      "DOM"
    ],
    "declaration": true,                      /* Generates corresponding '.d.ts' file. */
    "declarationMap": true,                   /* Generates a sourcemap for each corresponding '.d.ts' file. */
    "sourceMap": true,                        /* Generates corresponding '.map' file. */
    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    "strict": true,                           /* Enable all strict type-checking options. */
    "outDir": "./dist",
    "noImplicitAny": false,                    /* Raise error on expressions and declarations with an implied 'any' type. */
    "moduleResolution": "node",               /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
  },
  "include": ["src/"],
  "exclude": ["**/*.spec.ts"]
}