i am a free programmer and recently learning about Typescript, more specifically i am experimenting with writing some code to get the value/typeof of any value inside a json object based on the path string, supporting correct pathing. Here is mine

My object looklike:

const my_user = {
    id: 201,
    name: 'Join Doe',
    married: false,
    details: {
        phone: '+0123-456-789',
        address: 'st12, RickRoll Street',
    },
}

My type Key that help to make an correct string path of every value in the object:

type Key<O extends object> = { [K in keyof O]: O[K] extends undefined ? never : O[K] extends object
    ? `${K & string}.${Key<O[K]>}`
    : `${K & string}`
}[keyof O]

My type Vlu that return type of the value with a correct string path

type Vlu<O extends object, P extends string> = P extends keyof O ? O[P] : P extends `${infer K}.${infer Rest}`
    ? K extends keyof O
    ? O[K] extends object
    ? Vlu<O[K], Rest>
    : never
    : never
    : never

And then i have a fn to read object like this
(wrong path will mark as red by typescript, orelse return the value with it type)

const get = <O extends object, P extends Key<O>>(obj: O, paths: P): Vlu<O, P> => {
    const rs = paths.split('.').reduce((obj, path) => obj[path], obj as any);
    console.log(paths, rs, typeof rs)
    return rs
}

Everything is great so far, but i realized i am not done yet, an object can be an Array and can contain an Array, i have no idea for this.
(there is no path for an item in array, cant using index, if the elements in the array are not of the same type, … etc)

Sorry if my question is not clear and my bad eng but if you understand then can u give me some idea, i very appreciated.