3 files changed, 55 insertions, 8 deletions
diff --git a/script/core/diagnostics/inject-field.lua b/script/core/diagnostics/inject-field.lua
new file mode 100644
index 00000000..62e1d1ca
--- /dev/null
+++ b/script/core/diagnostics/inject-field.lua
@@ -0,0 +1,54 @@
+local files   = require 'files'
+local vm      = require 'vm'
+local lang    = require 'language'
+local guide   = require 'parser.guide'
+local await   = require 'await'
+
+local skipCheckClass = {
+    ['unknown']       = true,
+    ['any']           = true,
+    ['table']         = true,
+}
+
+---@async
+return function (uri, callback)
+    local ast = files.getState(uri)
+    if not ast then
+        return
+    end
+
+    ---@async
+    local function checkInjectField(src)
+        await.delay()
+
+        local node = src.node
+        if node then
+            local ok
+            for view in vm.getInfer(node):eachView(uri) do
+                if skipCheckClass[view] then
+                    return
+                end
+                ok = true
+            end
+            if not ok then
+                return
+            end
+        end
+        local message = lang.script('DIAG_INJECT_FIELD', guide.getKeyName(src))
+        if     src.type == 'setfield' and src.field then
+            callback {
+                start   = src.field.start,
+                finish  = src.field.finish,
+                message = message,
+            }
+        elseif src.type == 'setfield' and src.method then
+            callback {
+                start   = src.method.start,
+                finish  = src.method.finish,
+                message = message,
+            }
+        end
+    end
+    guide.eachSourceType(ast.ast, 'setfield',  checkInjectField)
+    guide.eachSourceType(ast.ast, 'setmethod', checkInjectField)
+end
diff --git a/script/core/diagnostics/undefined-field.lua b/script/core/diagnostics/undefined-field.lua
index a83241f5..4fd55966 100644
--- a/script/core/diagnostics/undefined-field.lua
+++ b/script/core/diagnostics/undefined-field.lua
@@ -8,13 +8,6 @@ local skipCheckClass = {
     ['unknown']       = true,
     ['any']           = true,
     ['table']         = true,
-    ['nil']           = true,
-    ['number']        = true,
-    ['integer']       = true,
-    ['boolean']       = true,
-    ['function']      = true,
-    ['userdata']      = true,
-    ['lightuserdata'] = true,
 }
 
 ---@async
@@ -61,5 +54,4 @@ return function (uri, callback)
     end
     guide.eachSourceType(ast.ast, 'getfield',  checkUndefinedField)
     guide.eachSourceType(ast.ast, 'getmethod', checkUndefinedField)
-    guide.eachSourceType(ast.ast, 'getindex',  checkUndefinedField)
 end
diff --git a/script/proto/diagnostic.lua b/script/proto/diagnostic.lua
index 9c095531..61b8ff4b 100644
--- a/script/proto/diagnostic.lua
+++ b/script/proto/diagnostic.lua
@@ -77,6 +77,7 @@ m.register {
     'param-type-mismatch',
     'cast-type-mismatch',
     'return-type-mismatch',
+    'inject-field',
 } {
     group    = 'type-check',
     severity = 'Warning',