fix #1306

Author: sumneko

changelog.md

@@ -50,6 +50,7 @@
 * `FIX` [#1284](https://github.com/sumneko/lua-language-server/issues/1284)
 * `FIX` [#1292](https://github.com/sumneko/lua-language-server/issues/1292)
 * `FIX` [#1294](https://github.com/sumneko/lua-language-server/issues/1294)
+* `FIX` [#1306](https://github.com/sumneko/lua-language-server/issues/1306)
 * `FIX` [#1311](https://github.com/sumneko/lua-language-server/issues/1311)
 * `FIX` [#1317](https://github.com/sumneko/lua-language-server/issues/1317)
 * `FIX` [#1320](https://github.com/sumneko/lua-language-server/issues/1320)

script/vm/type.lua

@@ -324,6 +324,9 @@ function vm.canCastType(uri, defNode, refNode)
     if defInfer:view(uri) == 'unknown' then
         return true
     end
+    if refInfer:view(uri) == 'unknown' then
+        return true
+    end
 
     if vm.isSubType(uri, refNode, 'nil') then
         -- allow `local x = {};x = nil`,

test/diagnostics/type-check.lua

@@ -722,5 +722,12 @@ if t then
 end
 ]]
 
+config.set(nil, 'Lua.type.weakUnionCheck', true)
+TEST [[
+---@type number
+local x = G
+]]
+config.set(nil, 'Lua.type.weakUnionCheck', false)
+
 config.remove(nil, 'Lua.diagnostics.disable', 'unused-local')
 config.remove(nil, 'Lua.diagnostics.disable', 'undefined-global')