Analyzing the type of object properties from a different perspective

I am new to TypeScript and have encountered many similar questions. I was able to find a solution, but I'm not sure if it's the most efficient one.

When constructing the target object as

{obj: someObject, prop: "objectPropName"}
, I pass it to various React components as a prop. The type of someObject can vary among about 20 different types, each corresponding to a data model in my database. Naturally, I want to ensure type safety.

My ideal scenario would involve specifying the type of target as:

type ObjWithPropertyName = {
    obj: Record<string, unknown>,
    property: **keyof obj**
}

...but unfortunately, that doesn't quite work :)

The best solution I came up with is to create a function that returns a properly-typed target object:

function getTarget<T>(obj: T, propName: keyof T) {
    return {obj: obj, property: propName}
}

However, this approach seems a bit messy, especially on the receiving component side where I have to do something similar when handling the target object as a prop.

How would you approach this situation?

Answer №1

Simply create a generic interface specifically designed for this task:

interface ObjectWithPropertyName<T> { // can also be used with the 'type' keyword
  property: keyof T;
  obj: T;
}

Experience it firsthand on the sandbox

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