Error when accessing missing properties

definitely.js

class MissingPropertyAccess extends TypeError {
  get name() {
    return this.constructor.name;
  }

  constructor(object, property) {
    super(`access to missing property ${String(property)}`);
    this.object = object;
    this.property = property;
  }
}

const traps = {
  get(target, property) {
    if (property in target) {
      return target[property];
    }
    throw new MissingPropertyAccess(target, property);
  }
};

export const definitely = obj => new Proxy(obj, traps);

const deepTraps = {
  get(target, property) {
    if (property in target) {
      const value = target[property];
      return value !== null && typeof value === "object"
        ? definitelyDeep(value)
        : value;
    }
    throw new MissingPropertyAccess(target, property);
  }
};

export const definitelyDeep = obj => new Proxy(obj, deepTraps);

export { definitely as default}
definitely.deep = definitelyDeep