Similar to this quesiton: how to reference all parameters except first in typescript

But here, I Want to get all parameters except the last one.

The accepted answer over there did not work in this use case.

Is there a way to do that?

CodePudding user response：

You can use a conditional type and spread the inferred initial parameters:

type InitialParameters<F extends (...args: any) => any> =
  Parameters<F> extends [...infer P, any] ? P : never

const f = (str: string, n: number, b: boolean) => {}

type Test = InitialParameters<typeof f>
// [str: string, n: number]

TypeScript playground

CodePudding user response：

First, reverse()

and

function aa(a1,...rest){
    console.log(a1,"",rest);
}