Tree path array

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题目

Create a type Path that represents validates a possible path of a tree under the form of an array.

Related challenges:

• Object key path

declare const example: {
  foo: {
    bar: {
      a: string;
    };
    baz: {
      b: number;
      c: number;
    };
  };
};

// Possible solutions:
// []
// ['foo']
// ['foo', 'bar']
// ['foo', 'bar', 'a']
// ['foo', 'baz']
// ['foo', 'baz', 'b']
// ['foo', 'baz', 'c']

解答

type Path<T, P extends PropertyKey[] = []> =
  | P
  | { [K in keyof T]: Path<T[K], [...P, K]> }[keyof T];