PieterP
tRPC•3y ago•
5 replies
Pieter

How to get response type depending on the input params?

Simple example of a normal JS function with generics:
const example = <T extends unknown>(params: T): T => {
  return params
}

// TYPE: const params: readonly ["Hello", "World"]
const params = ['Hello', 'World']

// TYPE: const result: readonly ["Hello", "World"]
const result = example(params)

// TYPE: const str1: string, const str2: string
const [str1, str2] = result


This is what I want to achieve with TRPC. If I send some params I want my respone type be able to change depending on the params. How can I achieve that? 
// TYPE: const params: readonly ["Hello", "World"]
const params = ['Hello', 'World']

const { data } = trpc.router.model.example(params)

// I want the following type returned based on the params 
// TYPE: const result: readonly ["Hello", "World"]
const result = data;

// I want the same result as in the simple example
// TYPE: const str1: string, const str2: string
const [str1, str2] = result
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