Safely get deep nested property of object

get.ts

function get<
  T,
  K extends keyof T,
  T1 extends T[K],
  K1 extends keyof T1,
  T2 extends T1[K1],
  K2 extends keyof T2,
  T3 extends T2[K2],
  K3 extends keyof T3,
  R extends T3[K3]
>(
  obj: T,
  path: [K, K1, K2, K3]
): R 

function get<
  T,
  K extends keyof T,
  T1 extends T[K],
  K1 extends keyof T1,
  T2 extends T1[K1],
  K2 extends keyof T2,
  R extends T2[K2]
>(
  obj: T,
  path: [K, K1, K2]
): R

function get<
  T,
  K extends keyof T,
  T1 extends T[K],
  K1 extends keyof T1,
  R extends T1[K1]
>(
  obj: T,
  path: [K, K1]
): R

function get<
  T,
  K extends keyof T,
  R extends T[K]
>(
  obj: T,
  path: [K]
): R

function get<
  T,
  K extends keyof T,
  R extends T[K]
>(
  obj: T,
  path: [K]
): R{
  let res;
  for (const key of path) {
    res = obj[key];
    if (res) {
      return res;
    }
  }
  return void 0;
};

interface D {
  dd: number;
}

interface BB {
  c: string;
  d: D;
}

interface B {
  aa: number;
  bb: BB;
}

interface OO {
  a: number;
  b: B;
}

const oo = {
  a: 10,
  b: {
    aa: 10,
    bb: {
      c: 'hello',
      d: {
        dd: 11
      }
    }
  }
};

const r = get(oo, ['a']);

console.log('r is: ', r);