Improve signal setter type for code completion of string literal unions.

[Huliiiiii]

Summary

Improve signal setter type for code completion of string literal unions.

How did you test this change?

Reorder overload signatures

type setterNew<in out T> = {
    <U extends T>(value: Exclude<U, Function> | ((prev: T) => U)): U;
    <U extends T>(
        ...args: undefined extends T ? [] : [value: (prev: T) => U]
    ): undefined extends T ? undefined : U
    <U extends T>(value: Exclude<U, Function>): U
    <U extends T>(value: (prev: T) => U): U

}

type SetterOld<in out T> = {
  <U extends T>(...args: undefined extends T ? [] : [value: (prev: T) => U]): undefined extends T
    ? undefined
    : U;
  <U extends T>(value: (prev: T) => U): U;
  <U extends T>(value: Exclude<U, Function>): U;
  <U extends T>(value: Exclude<U, Function> | ((prev: T) => U)): U;
};


type strUnion = "foo" | "bar"

const setterNew: setterNew<strUnion> = (x) => x
const setterOld: SetterOld<strUnion> = (x) => x

setterNew() // completion: "foo" | "bar"
setterNew(x => "") // completion: "foo" | "bar"
// We can all get completion
setterOld() // completion: none
setterOld(x => "") // completion: "foo" | "bar"
// We cant get completionon first function

typescript playground

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Latest commit: ee8b9eb

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