check equality depp

deepEquals.ts

function is(x: unknown, y: unknown): boolean {
  if (x === y) {
    return x !== 0 || y !== 0 || 1 / x === 1 / y;
  } else {
    return x !== x && y !== y;
  }
}

export function deepEquals<T>(objA: T, objB: T): boolean {
  if (is(objA, objB)) return true;

  if (
    typeof objA !== "object" ||
    objA === null ||
    typeof objB !== "object" ||
    objB === null
  ) {
    return false;
  }

  type tk = keyof T;

  const keysA = Object.keys(objA);
  const keysB = Object.keys(objB);

  if (keysA.length !== keysB.length) return false;

  for (let i = 0; i < keysA.length; i++) {
    if (!Object.prototype.hasOwnProperty.call(objB, keysA[i])) return false;

    if (typeof objA[keysA[i] as tk] === "object") {
      if (!deepEquals(objA[keysA[i] as tk], objB[keysA[i] as tk])) return false;
    } else {
      if (!is(objA[keysA[i] as tk], objB[keysA[i] as tk])) return false;
    }
  }
  return true;
}