tsconfig.json

{
  "compilerOptions": {
    "outDir": "./lib",
    "esModuleInterop": true,
    "target": "es5",
    "moduleResolution": "node",
    "importHelpers": true,
    "sourceMap": true,
    "declaration": true,
    "skipLibCheck": true,
    "baseUrl": "./",
    "preserveSymlinks": true,
    "allowJs": true,

    "lib": ["es2020"],
    "module": "commonjs",
    "resolveJsonModule": true,
    "types": ["node", "jest"],

    // https://github.com/microsoft/TypeScript/issues/40328
    "noEmitHelpers": false,

    // Strictness and code quality options
    "alwaysStrict": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "importsNotUsedAsValues": "error",
    "noFallthroughCasesInSwitch": true,
    "noImplicitOverride": true,
    "noImplicitReturns": true,
    "noPropertyAccessFromIndexSignature": false,
    "noUncheckedIndexedAccess": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true
  },
  "exclude": [
    "node_modules",
    "**/*.spec.ts"
  ],
  "include": [
    "./src/**/*.ts",
    "./src/**/*.json",
    "./__tests__/**/*.ts"
  ]
}