General improvements

[rdiazv]

This works in conjunction with masylum/mobx-rest/pull/39.

Changes

• Adds methods for patch and head requests.
• Adds method errorUnwrap that keeps the previous behavior of returning error.errors || {} when the request fails, but allows overriding.
• Allows to pass options to qs.stringify. In my particular case I'm doing this:

apiClient(adapter, {
  defaults: { // Previously `commonOptions`
    qs: {
      arrayFormat: 'brackets'
    }
  }
})

Breaking changes

• Renames apiPath to urlRoot.
• Renames commonOptions to defaults.
• Removes fetch-ponyfill. If the host app already has a polyfill this will just be adding unused bytes. I think the developer should include a fetch polyfill in his app, if needed.
• Rejections now returns { requestResponse, error }, requestResponse being the original request response object and error the result of errorUnwrap. This allows to get response headers, status, etc.

Fixes

• Sets undefined body when options.data is not specified. TypeError: HEAD or GET Request cannot have a body. JakeChampion/fetch#402

Notes

We aren't using the jquery-adapter, so these changes will have to be applied/tested there also.

[masylum]

Will check this. Looking pretty solid.

[masylum]

just to understand, why this change?

[rdiazv]

For this JakeChampion/fetch#402. Particularly, Edge was failing with the error Failed to execute 'fetch()' on 'Window': HEAD or GET Requests cannot have a body.

Related: agraboso/redux-api-middleware#138

[masylum]

Looking good. I can't merge this until releasing the new version of mobx-rest though. The breaking changes must be applied there first.