Static property is possibly undefined but error is not caught

[millsp]

Bug Report

🔎 Search Terms

static property error undefined

🕗 Version & Regression Information

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

⏯ Playground Link

Playground link with relevant code

💻 Code

class A {
    hello() {}
}

class B {
    static a: A
}

B.a.hello() // crash

🙁 Actual behavior

Crash because ts assumed that the static property was not undefined

🙂 Expected behavior

Either require a definite assignment assertion or an inline assignment

[MartinJohns]

Duplicate of #27899. Search terms: static undefined