Identifying data types of objects through generic value recognition

Is there a way to detect the parameter type of a function using the described type and create an object with the same structure, identifying the provided fields and their value types based on the description?

Here is an example:

// Define the type
type StorageData = {
  prop1: boolean;
  prop2: number;
  prop3: string;
  prop4: "static" | "dynamic";
};

type ParamsToGet = Partial<StorageData>;

type Callback<T> = (data: T) => void;

type Get = <T extends ParamsToGet>(params: T, callback: Callback<T>) => void;

declare const get: Get;

Usage:

get({ prop1: false, prop4: "static", prop2: 1}, (data) => { ... });

/*
Current typing:

data: {
    snowfallColor: string;  // okay
    snowfallZtop: true;     // unexpected, should be boolean
    snowfallCount: number;  // okay
}
*/

The issue lies in the incorrect detection of property value types - instead of getting booleans for certain properties, I am receiving true or false values directly.

Answer №1

Instead of using the generic type StorageData as an extension, you could consider extending keyof StorageData. This approach allows TypeScript to provide more specific functionality while still retaining the original data types:

type Get = <K extends keyof StorageData, T = Pick<StorageData, K>>(params: T, callback: Callback<T>) => void;

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