tsconfig.json

{
  "compilerOptions": {
    "declaration": true,
    "strict": true,
    /* Visit https://aka.ms/tsconfig.json to read more about this file */

    /* Basic Options */
    "target": "es2017",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
    "lib": ["ES6", "DOM"],                             /* Specify library files to be included in the compilation. */
    "allowJs": true,                       /* Allow javascript files to be compiled. */
    "outDir": "./lib",                        /* Redirect output structure to the directory. */
    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    "removeComments": true,                /* Do not emit comments to output. */

    /* Strict Type-Checking Options */

    /* Additional Checks */

    /* Module Resolution Options */
    "typeRoots": [
      "./node_modules/@types",
      "./src/@types"
    ],                       /* List of folders to include type definitions from. */
    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */

    /* Source Map Options */

    "resolveJsonModule": true,

    /* Experimental Options */

    /* Advanced Options */
    "skipLibCheck": true,                     /* Skip type checking of declaration files. */
    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
  },

  "exclude": ["./classTest.js", "./lib"],
}