[language-(java|type)script] Scope ??=, ++, etc., as assignments

packages/language-javascript/grammars/tree-sitter/highlights.scm

@@ -117,10 +117,25 @@
 (augmented_assignment_expression
   left: (identifier) @variable.other.assignment.js)
 
+; The "bar" in `foo.bar += 1`.
+(augmented_assignment_expression
+  left: (member_expression
+    property: (property_identifier) @variable.other.assignment.property.js)
+    (#is-not? test.rangeWithData isFunctionProperty)
+    (#set! capture.final))
+
 ; The "foo" in `foo++`.
 (update_expression
   argument: (identifier) @variable.other.assignment.js)
 
+; The "bar" in `foo.bar++`.
+(update_expression
+  argument: (member_expression
+    property: (property_identifier) @variable.other.assignment.property.js)
+    (#is-not? test.rangeWithData isFunctionProperty)
+    (#set! capture.final))
+
+
 ; Public field definition in a class body:
 ; The "foo" in `foo = "bar";`
 (field_definition

packages/language-typescript/grammars/common/highlights.scm

@@ -116,10 +116,24 @@
 (augmented_assignment_expression
   left: (identifier) @variable.other.assignment._LANG_)
 
+; The "bar" in `foo.bar += 1`.
+(augmented_assignment_expression
+  left: (member_expression
+    property: (property_identifier) @variable.other.assignment.property._LANG_)
+    (#is-not? test.rangeWithData isFunctionProperty)
+    (#set! capture.final))
+
 ; The "foo" in `foo++`.
 (update_expression
   argument: (identifier) @variable.other.assignment._LANG_)
 
+; The "bar" in `foo.bar++`.
+(update_expression
+  argument: (member_expression
+    property: (property_identifier) @variable.other.assignment.property._LANG_)
+    (#is-not? test.rangeWithData isFunctionProperty)
+    (#set! capture.final))
+
 ; `object_pattern` appears to only be encountered in assignment expressions, so
 ; this won't match other uses of object/prop shorthand.
 ((object_pattern