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va9iff/inferred_arrays.js

Created July 31, 2025 17:00
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Inferred empty arrays, even with static methods
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inferred_arrays.js
class A {
static foo() {
return true ? [] : [ new this() ]
}
}
const arr = A.foo() // type: A[]
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va9iff commented Jul 31, 2025

I needed an empty array of type its class. I couldn't use the this type in static methods with JSDoc. I didn't wanted to instantiate an object so, I came up with this fuckery

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va9iff commented Jul 31, 2025

nevermind. I made it to be able to extend and then use .all while having the extended class type inferred. but no, if I do class B extends A{}; new B().all it still sees it as A[]

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