can not get correct params type when using Parameters to overloaded function

[LaamGinghong]

Bug Report

🔎 Search Terms

• overloaded funciton
• type
• Parameters

⏯ Playground Link

https://www.typescriptlang.org/play?#code/LAKAlgdgLgpgTgMwIYGMYAIBiF0G9TroAUMAbjNAFzoDOUckA5gDToAOScSAtjQPzUkEAJ4BKaqQD2YACYFiZClBrUA2nQYQW6IcL4BdVfvHops0AF9QoKMLYZsABU48a6ALzpnXbjFhwaAB5sAD5QAHpwwkIAPT4gA

💻 Code

interface Fn {
  (event: string, params?: any): void
  (events: [string, any?][]): void
}

type FnParams = Parameters<Fn>
//    ^?

🙁 Actual behavior

only get last case's type.

🙂 Expected behavior

get all cases's type

[fatcerberus]

Duplicate of #43731.

This is a known (and documented) design limitation:
https://www.typescriptlang.org/docs/handbook/2/conditional-types.html#inferring-within-conditional-types

When inferring from a type with multiple call signatures (such as the type of an overloaded function), inferences are made from the last signature (which, presumably, is the most permissive catch-all case). It is not possible to perform overload resolution based on a list of argument types.

[typescript-bot]

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