Update mini_racer to support logical nullish #883

Author: JasonBarnabe

Gemfile.lock

@@ -214,7 +214,7 @@ GEM
       activerecord (>= 6.1.0)
     json (2.5.1)
     jwt (2.2.2)
-    libv8 (8.4.255.0)
+    libv8-node (15.14.0.0)
     listen (3.5.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -230,8 +230,8 @@ GEM
     mini_magick (4.11.0)
     mini_mime (1.0.3)
     mini_portile2 (2.5.0)
-    mini_racer (0.3.1)
-      libv8 (~> 8.4.255)
+    mini_racer (0.4.0)
+      libv8-node (~> 15.14.0.0)
     minitest (5.14.4)
     minitest-around (0.5.0)
       minitest (~> 5.0)

test/lib/js_checker_test.rb

@@ -25,4 +25,10 @@ class JsCheckerTest < ActiveSupport::TestCase
     assert_not jsc.check
     assert_not_empty jsc.errors
   end
+
+  test 'logical nullish' do
+    jsc = ::JsChecker.new('let x = null; x ??= 1;')
+    assert jsc.check
+    assert_empty jsc.errors
+  end
 end