@apollo/gateway/src/utilities/own.ts

Apollo Gateway

export function hasOwn(obj: object, prop: PropertyKey): boolean {
  return Object.prototype.hasOwnProperty.call(obj, prop)
}

export function getOwn<T, K extends keyof T>(obj: T, prop: K): T[K] | undefined {
  return Object.prototype.hasOwnProperty.call(obj, prop)
    ? obj[prop]
    : undefined;
}

export function defineOwn(obj: object, prop: PropertyKey) {
  if (!hasOwn(obj, prop) && prop in obj) {
    Object.defineProperty(
      obj,
      prop,
      {
        configurable: true,
        enumerable: true,
        value: undefined,
        writable: true,
      }
    );
  }
}