Examples for "meta"

[ronag]

Right now it is a bit diffuse when one should use meta over payload. Some more descriptive examples might be a good idea?

[queckezz]

From my perspective, I think payload is used for data that is necessary to update a given state to a new state whereas meta can be used for literally anything, commonly middleware. It's extra Information.

A good example of using meta is redux-effects, where it's used to define future step()s for an effect. This is not necessary for updating the current state but for the middleware:

{
  type: 'FETCH',
  payload: {url: '/some/thing', method: 'GET'},
  meta: {
    steps: [
      [success, failure]
    ]
  }
}

and it's used in: redux-effects#L16