Add diagnostic warning about any global (#1)

* Add warning for any global variable via diagnostic
* Add messages in en-US
  TODO: add messages in languages other than en-us as well
* fallback: enable/disable diagnostics w/ annotation
* Add tests for the new diagnostic
* Add diagnostic and group to config.md

1 files changed, 17 insertions, 0 deletions

diff --git a/doc/zh-cn/config.md b/doc/zh-cn/config.md
index 991932b6..869e2506 100644
--- a/doc/zh-cn/config.md
+++ b/doc/zh-cn/config.md
@@ -238,6 +238,7 @@ Array<string>
 * ``"err-nonstandard-symbol"``
 * ``"err-then-as-do"``
 * ``"exp-in-action"``
+* ``"global-element"``
 * ``"global-in-nil-env"``
 * ``"index-in-func-name"``
 * ``"invisible"``
@@ -468,6 +469,10 @@ object<string, string>
     */
     "strict": "Fallback",
     /*
+    * global-element
+    */
+    "strict-convention": "None",
+    /*
     * no-unknown
     */
     "strong": "Fallback",
@@ -587,6 +592,10 @@ object<string, string>
     */
     "strict": "Fallback",
     /*
+    * global-element
+    */
+    "strict-convention": "Fallback",
+    /*
     * no-unknown
     */
     "strong": "Fallback",
@@ -775,6 +784,10 @@ object<string, string>
     */
     "empty-block": "Opened",
     /*
+    Enable diagnostics to warn about global elements.
+    */
+    "global-element": "None",
+    /*
     不能使用全局变量（ `_ENV` 被设置为了 `nil`）
     */
     "global-in-nil-env": "Any",
@@ -1022,6 +1035,10 @@ object<string, string>
     */
     "empty-block": "Hint",
     /*
+    Enable diagnostics to warn about global elements.
+    */
+    "global-element": "Warning",
+    /*
     不能使用全局变量（ `_ENV` 被设置为了 `nil`）
     */
     "global-in-nil-env": "Warning",