Unraveling the mysteries of an undefined entity

When the variable response is undefined, attempting to retrieve its property status will result in an error:

Error: Unable to access property 'status' of undefined

const {
  response,
  response: { status },
  request,
  config,
} = error as AxiosError

Even assigning a default value to status does not prevent this error. The issue still occurs with response.

For example:

response: { status = 420 },

Is there a safe way to destructure this object? Appreciate any help.

Answer №1

It is advisable to avoid using destructuring for objects that contain optional properties.

If your main scenario is covered by

const {
  response,
  request,
  config
} = error as AxiosError;

It's simpler to follow up with a new const declaration utilizing optional chaining and null coalescing:

const status = response?.status ?? 420;

Otherwise, your destructuring becomes cumbersome as you need to include multiple levels of default values:

const {
  response,
  response: {
    status = 420
  } = {}, // this could even be { status = ### } and differ from the other default value
  request,
  config
} = error as AxiosError;

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