tsconfig.json

{
  "compilerOptions": {
    "target": "ES2020",
    "module": "commonjs",
    "declaration": true,                         /* Generates corresponding '.d.ts' file. */
    // "sourceMap": true,                           /* Generates corresponding '.map' file. */
    // "outFile": "./build/index.js",                             /* Concatenate and emit output to single file. */
    "outDir": "./build",                              /* 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": true,  
    // "useUnknownInCatchVariables": false,
    "esModuleInterop": true,                        /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */

    /* Advanced Options */
    "skipLibCheck": true,                           /* Skip type checking of declaration files. */
    "forceConsistentCasingInFileNames": true        /* Disallow inconsistently-cased references to the same file. */
  },
  "exclude": ["node_modules", "test", "build", "**/*spec.ts"]
}