tsconfig.json

{
  "compilerOptions": {
    /* Language and Environment */
    "target": "es2016",                                     /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
    /* Modules */
    "module": "CommonJS",                                /* Specify what module code is generated. */
    "typeRoots": ["./node_modules/@types", "./types"],   /* Specify multiple folders that act like './node_modules/@types'. */
    /* Interop Constraints */
    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */
    /* Type Checking */
    "strict": true,                                      /* Enable all strict type-checking options. */
  },
  "include": ["src/*",
              "src/types/**/*"]
}