tsconfig.json

{
  "compilerOptions": {
    /* Language and Environment */
    "target": "es5",                                     /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
    "lib": ["es5"],                                      /* Specify a set of bundled library declaration files that describe the target runtime environment. */

    /* Modules */
    "module": "commonjs",                                /* Specify what module code is generated. */
    "rootDir": "./lib",                                  /* Specify the root folder within your source files. */
    "resolveJsonModule": true,                           /* Enable importing .json files */

    /* Emit */
    "declaration": true,                                 /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
    "outDir": "./dist",                                   /* Specify an output folder for all emitted files. */

    /* 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. */
    "noImplicitAny": true,                               /* Enable error reporting for expressions and declarations with an implied `any` type.. */
    "strictNullChecks": true,                            /* When type checking, take into account `null` and `undefined`. */
    "noUnusedLocals": true,                              /* Enable error reporting when a local variables aren't read. */

    "skipLibCheck": true,
  },
  "include": ["lib/**/*", "lib/jest-config.json"],
  "exclude": ["node_modules", "dist"]
}