How to handle such an exception using TS?

Question

typescript

type Item = {
  title: string
}
const arr : Item[] = []
const a = arr[0].title.length //error , но TS молчит

Answer 1

const arr1 : [Item, ...Item[]] = [{ title: 'a' }] // OK
const arr2 : [Item, ...Item[]] = [] // Не скомпилируется

Playground
By using this tuple type instead of a normal array, you can REQUIRE some number of elements at the beginning of the array.

Answer 2

If TS is higher than 4.1 then add to tsconfig.json in compilerOptions:
"noUncheckedIndexedAccess": true
TS will complain about unchecked index access