when do you use Object.defineProperty()

Question

I\'m wondering when I should use

Object.defineProperty

to create new properties for an object. I\'m aware that I\'m able to set things lik

Answer 1

One neat use case I have seen for defineProperty is for libraries to provide an error property to the user which, if it's not accessed within a certain interval you would throw yourself. For example:

let logErrorTimeoutId = setTimeout(() => {
  if (error) {
    console.error('Unhandled (in )', error.stack || error);
  }
}, 10);

Object.defineProperty(data, 'error', {
    configurable: true,
    enumerable: true,
    get: () => {
      clearTimeout(logErrorTimeoutId);
      return error;
    },
  });

Source for this code: https://github.com/apollographql/react-apollo/blob/ffffd3d8faabf135dca691d20ce8ab0bc24ccc414e/src/graphql.tsx#L510