Theo's Typesafe Cult•3y ago

Is it possible to infer a const type from a Set?

Say I have const foo = new Set([1,2,3]) how can I infer the type of foo as const? For example, const bar = [...foo.keys()] as const is of type number[] instead of type 1 | 2 | 3.

4 Replies

Unknown User•3y ago

Message Not Public

bentenOP•3y ago

Hmm

const foo = new Set([1,2,3] as const)
class Hehe {
  constructor(input: Set<unknown>){
    this.foo = input
  }
  bar(Record<???, string>){
    //...
  }
}

const foo = new Set([1,2,3] as const)
class Hehe {
  constructor(input: Set<unknown>){
    this.foo = input
  }
  bar(Record<???, string>){
    //...
  }
}

How would I type this then If I wanted the type of Bar(paramater) to be 1|2|3 ? keyof typeof this.foo doesn't work

Unknown User•3y ago

Message Not Public

bentenOP•3y ago

beautiful thanks One more question - If I want to allow other values as the key, but still want autocomplete is that possible? something like T | string doesn't work never mind i got it

Gaming

Programming

Is it possible to infer a const type from a Set?