Should wx.request have a type parameter?

[geoffliu]

Currently, the res.data field in the success callback has type 'string | Record<string, any> | ArrayBuffer. This means to properly use this, I have to do this (pseudocode):

if (typeof res.data is string or array buffer) {
  raise error
}
use res.data as type any object

There are two problems with this. 1. I know my backend API returns JSON in the success case, so the string and ArrayBuffer cases are never actually in use. 2. res.data is simply any object, I can't specify its type without doing an explicit cast every time.

Proposal: define wx.request as something similar to the following:

request<T>({
  success: ({ data: T, ... }) => void,
  ...
})

While we're at it, it'd be useful to define an error type as well, for the fail callback.

[SgLy]

wx.request can have a generic, this will be tracked in #177, closing duplicated