tsconfig.json

{
  "compilerOptions": {
    "target": "ESNext",
    "outDir": "build",
    "useDefineForClassFields": true,
    "module": "ESNext",
    "lib": ["ESNext", "DOM"],
    "moduleResolution": "Node",
    "strict": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    "esModuleInterop": true,
    "noEmit": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "skipLibCheck": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": true,
    "strictFunctionTypes": true,
    "strictNullChecks": false
  }
}