15260 - Tree path array

[baian1]

type Path<T> = T extends Record<PropertyKey, unknown>
  ? {
      [P in keyof T]: [P, ...Path<T[P]>] | [P];
    }[keyof T]
  : never;

[handletastic]

I have been trying to solve a problem like this for a while and just tested your solution.
I wonder if there is a way to make it so that the second value in the array is restricted instead of suggesting non valid values as well as limit the number of items in the array that are actually valid given the path choice:

type User = {
    name: string;
    age: number;
    address: {
        street: string;
        city: string;
    };
    profession: {
        title: string;
        salary: number;
        experience: {
            years: number;
        };
    };
    // friends: ['Bob', 'Jane', 'John'];
};

type Path<T> = T extends Record<PropertyKey, unknown>
    ? {
        [P in keyof T]: [P, ...Path<T[P]>] | [P];
    }[keyof T]
    : never;

const r: Path<User> = ['profession'];