tsconfig.json

{
  "files": ["src/index.ts"],
  "compilerOptions": {
    /* Type Checking */
    "allowUnreachableCode": false,
    "allowUnusedLabels": false,
    "alwaysStrict": true,
    "exactOptionalPropertyTypes": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": true,
    "noImplicitOverride": true,
    "noImplicitReturns": true,
    "noImplicitThis": true,
    "noPropertyAccessFromIndexSignature": true,
    "noUncheckedIndexedAccess": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "strict": true,
    "strictBindCallApply": true,
    "strictFunctionTypes": true,
    "strictNullChecks": true,
    "strictPropertyInitialization": true,
    "useUnknownInCatchVariables": true,

    /* Modules */
    "module": "ESNext",
    "moduleResolution": "bundler",
    "typeRoots": ["src/@types", "./node_modules/@types"],

    /* Emit */
    "declaration": true,
    "declarationMap": false,
    "outDir": "dist",
    "sourceMap": false,

    /* JavaScript Support */
    "allowJs": false,

    /* Interop Constraints */
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "isolatedModules": true,

    /* Language and Environment */
    "target": "ESNext"
  }
}