Array.IsArray incorrect type guard

[JakeCoxon]

Bug Report

🔎 Search Terms

Array isArray unknown any type guard

🕗 Version & Regression Information

3.3.3 - 4.3.4

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about type guard

⏯ Playground Link

Playground link with relevant code

💻 Code

const x: unknown = ['asdasd']

if (Array.isArray(x)) {
    x[0] - 123123
}

🙁 Actual behavior

It passes type checking

🙂 Expected behavior

I would expect it to fail because although x is an array, x[0] should still be unknown. I'd expect to be forced to check the type of the items

[MartinJohns]

Duplicate of #44703 / #41808. Search terms: Array.isArray in:title

[JakeCoxon]

^ I saw that issue but it is very vague and I couldn't work out if it is the same problem

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.