GenericTypes.ts

type A = {
    company_name: string
}
type B = {
    person_name: string
}
enum CBURL {
    GET_COMPANY = "/companies",
    GET_PEOPLE = "/people"
}
interface CB_RESPONSES {
    [CBURL.GET_COMPANY]: A
    [CBURL.GET_PEOPLE]: B
}
interface CB_REQUEST {
    [CBURL.GET_COMPANY]: CB_URL_UUID_REQUEST<CBURL.GET_COMPANY>
    [CBURL.GET_PEOPLE]: CB_URL_REQUEST<CBURL.GET_PEOPLE>
}
interface CB_URL_REQUEST<U extends CBURL> {
    url: U,
    params: {
        page?: number
    }
}
interface CB_URL_UUID_REQUEST<U extends CBURL> extends CB_URL_REQUEST<U> {
    uuid: string
}
function fetch<U extends CBURL, R extends CB_URL_REQUEST<U>>(
    request: R extends CB_URL_UUID_REQUEST<infer U> ? CB_URL_UUID_REQUEST<U> : CB_URL_REQUEST<U>
): CB_RESPONSES[U] {
    return {}
}
let companyTest: A = fetch({
    url: CBURL.GET_COMPANY,
    params: {}
})
let personTest: B = fetch({
    url: CBURL.GET_PEOPLE,
    params: {}
})