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. */,
    "noEmit": true /* Disable emitting files from a compilation. */,
    "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. */,
    "noUncheckedIndexedAccess": true /* Add 'undefined' to a type when accessed using an index. */,
    "skipLibCheck": true /* Skip type checking all .d.ts files. */
  },
  "include": ["./"],
  "exclude": ["node_modules"] // which files to skip
}