tsconfig.json

{
  "compilerOptions": {
    "experimentalDecorators": true,
    "strict": true,
    "strictNullChecks": true,
    "exactOptionalPropertyTypes": true,
    "noImplicitAny": true,
    "noImplicitOverride": false,
    "noFallthroughCasesInSwitch": true,
    "esModuleInterop": true
  }
}