Recognize static initialization blocks

Closes #594

Author: dgutov

NEWS.md

@@ -1,5 +1,10 @@
 # History of user-visible changes
 
+## Next
+
+* Support for static initialization blocks
+  ([#594](https://github.com/mooz/js2-mode/issues/594)).
+
 ## 2023-04-08
 
 * Support top-level await

js2-mode.el

@@ -2339,7 +2339,7 @@ If any given node in NODES is nil, doesn't record that link."
   top)          ; top-level `js2-scope' (script/function)
 
 (js2--struct-put 'js2-scope 'js2-visitor 'js2-visit-block)
-(js2--struct-put 'js2-scope 'js2-printer 'js2-print-none)
+(js2--struct-put 'js2-scope 'js2-printer 'js2-print-block)
 
 (defun js2-node-get-enclosing-scope (node)
   "Return the innermost `js2-scope' node surrounding NODE.
@@ -11146,6 +11146,10 @@ expression)."
        ((and class-p
              (= tt js2-SEMI))
         nil)
+       ((and class-p
+             (eq tt js2-LC))
+        (setq after-comma nil
+              elem (js2-parse-block)))
        (t
         (js2-report-error "msg.bad.prop")
         (unless js2-recover-from-parse-errors

tests/parser.el

@@ -1058,6 +1058,9 @@ the test."
 (js2-deftest-parse parse-class-static-fields-no-semi
   "class C {\n  static a\n  static b = 42\n}")
 
+(js2-deftest-parse parse-class-static-block
+  "class Foo {\n  static {\n  a = 4;\n}\n}")
+
 ;;; Private names
 
 (js2-deftest-parse parse-class-private-field-with-init