Lua: keep CommonState object in the registry

The state is an internal value and should be treated as such. The
`PANDOC_STATE` global is merely a copy; unsetting the global no longer
breaks the Lua engine.

1 files changed, 6 insertions, 0 deletions

diff --git a/pandoc-lua-engine/test/lua/module/globals.lua b/pandoc-lua-engine/test/lua/module/globals.lua
index 52ef226bc..4df133e46 100644
--- a/pandoc-lua-engine/test/lua/module/globals.lua
+++ b/pandoc-lua-engine/test/lua/module/globals.lua
@@ -147,5 +147,11 @@ return {
     test('has property "verbosity"', function ()
       assert.are_equal(type(PANDOC_STATE.verbosity), 'string')
     end),
+    test('can be deleted without breaking PandocLua monad functions', function()
+      local state = PANDOC_STATE
+      PANDOC_STATE = nil
+      assert.is_nil(pandoc.mediabag.lookup('does-not-exist'))
+      PANDOC_STATE = state
+    end),
   },
 }