auto create class for enum fields

#1410

Author: sumneko

script/vm/global.lua

@@ -374,9 +374,18 @@ local compilerGlobalSwitch = util.switch()
         end
         source._enums = {}
         for _, field in ipairs(tbl) do
-            if field.type == 'tablefield'
-            or field.type == 'tableindex' then
+            if     field.type == 'tablefield' then
                 source._enums[#source._enums+1] = field
+                local subType = vm.declareGlobal('type', name .. '.' .. field.field[1], uri)
+                subType:addSet(uri, field)
+                field._globalNode = subType
+            elseif field.type == 'tableindex' then
+                source._enums[#source._enums+1] = field
+                if field.index.type == 'string' then
+                    local subType = vm.declareGlobal('type', name .. '.' .. field.index[1], uri)
+                    subType:addSet(uri, field)
+                    field._globalNode = subType
+                end
             end
         end
     end)

test/type_inference/init.lua

@@ -3947,3 +3947,18 @@ end
 
 local <?x?> = f(true)
 ]]
+
+TEST 'boolean' [[
+---@enum A
+local e = {
+    x = 1,
+    y = 2,
+}
+
+---@param p A
+---@overload fun(P: A.x): boolean
+---@overload fun(p: A.y): number
+local function f(p) end
+
+local <?r?> = f(e.x)
+]]