What is an improved method for defining a TypeScript type to store API method invocations?

Currently, I am exploring ways to enhance either GenericActionables or Items in a way that eliminates the need to manually add the API method name as a

GenericActionables<"nameOfNewMethod">
to the Actionables type every time. Any suggestions on how to achieve this synchronicity are welcome. Thank you :)

interface API {
    playSound: (id: string, volume: number) => void,
    playPool: (id: string, randomize: boolean) => void
}

type GenericActionables<T extends keyof API> = {
    method: T,
    params: Parameters<API[T]>
}

// Looking for an improved approach to defining Actionables
// so that it automatically aligns with any updates to the API
type Actionables =
    GenericActionables<"playSound"> |
    GenericActionables<"playPool">

export const actionables: Actionables[] = [
    {method: "playSound", params: ["quack", 0.8]}, // this should work
    {method: "playSound", params: ["quack", true]}, // this should NOT work
    {method: "playPool", params: ["smack", true]}, // this should work
    {method: "playPool", params: ["smack", 0.8]}, // this should NOT work
]

Answer №1

To implement this functionality, you can harness the power of mapped types:

For a comprehensive example, check out the code snippet on TS Playground

type Values<T> = T[keyof T];
type Actionables = Values<{ [K in keyof API]: GenericActionables<K> }>;

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