tsconfig.json

{
  "compilerOptions": {
    "types": [
      "node",
      "mocha"
    ],
    "target": "es6", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
    /* Modules */
    "module": "commonjs", /* Specify what module code is generated. */
    "rootDir": "./src", /* Specify the root folder within your source files. */
    "moduleResolution": "node", /* Specify how TypeScript looks up a file from a given module specifier. */
    /* Emit */
    "declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
    "outDir": "./lib", /* Specify an output folder for all emitted files. */
    "esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables `allowSyntheticDefaultImports` for type compatibility. */
    // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
    "forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */
    /* Type Checking */
    "strict": true, /* Enable all strict type-checking options. */
    "skipLibCheck": true /* Skip type checking all .d.ts files. */
  },
  "include": [
    "src/**/*"
  ],
  "exclude": [
    "node_modules"
  ],
}