tsconfig.json

{
  "compilerOptions": {
    "target": "esnext",
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": true,
    "skipLibCheck": true,
    "strict": true,
    "declaration": true,
    "incremental": true,
    "esModuleInterop": true,
    "module": "esnext",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noImplicitAny": true,
    "sourceMap": false,
    "allowUnreachableCode": false,
    "allowUnusedLabels": false,
    "strictNullChecks": true,
    "strictPropertyInitialization": false,
    "noFallthroughCasesInSwitch": true,
    "moduleResolution": "node",
    "noImplicitOverride": false,
    "noImplicitReturns": false,
    "noImplicitThis": true,
    "noPropertyAccessFromIndexSignature": false,
    "noUnusedLocals": true,
    "noUncheckedIndexedAccess": true,
    "baseUrl": "",
    "removeComments": true,
    "outDir": "build"
  },
  "include": ["index.ts", "lib/*.ts"],
  "exclude": ["node_modules", "build"]
}