Index Access Setting

tsconfig.json

{
  "compilerOptions": {
    ...
    "noUncheckedIndexedAccess": true
  }
}

With this flag enabled, TypeScript will warn us that mightNotExist could be undefined, prompting us to handle this case in our code.

This safety check isn’t just limited to arrays. It also applies to object properties, helping you avoid trying to access a property that may not exist.