Given the following code:

const nums = [1, 2, 3]
const filtered = nums.filter(n => n === 4)

filtered[100].toString()

Why isn't TypeScript complaining that .toString() wouldn't work because filtered[100] might be undefined?

Playground: https://www.typescriptlang.org/play?#code/MYewdgzgLgBGCuBbCMC8MDaBGANDATHgMwC6AUKJLAGYCWANlAKYBOTAJmnEhAHR2NWACjBoAfHDSp0AFgCUZMgOZt22AAzqSvKCADKUFrTABzIXKA