Support auto complete of callback arguments

[gotschmarcel-ni]

It would be awesome if functions that get passed as arguments (directly or via tables) to other functions get autocomplete for their argument types.

Examples

Directly pass a callback function to other function

---Work hard
---@param callback fun(value: number)
function work(callback)
    callback(22)
end

work(function (value)
  -- No autocomplete for value here
end)

or via custom table:

---@class work_item
---@field complete fun(value: number)
local work_item = {}

---Work hard
---@param item work_item
function work(item)
  item.complete(42)
end

work {
  complete = function (value)
    -- No autocomplete for value here
  end
}

[sumneko]

---@class Class
---@field x number
---@field y number

---@param callback fun(value: Class)
function work(callback)
end

work(function (value)
     value.$ -- provides `x` and `y` here
end)

Is this what you want?

[gotschmarcel-ni]

Yes, this is exactly what I mean.

[cryi]

I need this as well. Do you need help?