diff --git a/plugin/constants.py b/plugin/constants.py
index dc40b08..9374db5 100644
--- a/plugin/constants.py
+++ b/plugin/constants.py
@@ -4,6 +4,8 @@
 
 import sublime
 
+assert __package__
+
 PACKAGE_NAME = __package__.partition(".")[0]
 
 DB_FILE_IN_PACKAGE = f"Packages/{PACKAGE_NAME}/data/emoji-test.txt"
diff --git a/plugin/emoji.py b/plugin/emoji.py
index b3818fb..649f283 100644
--- a/plugin/emoji.py
+++ b/plugin/emoji.py
@@ -168,8 +168,8 @@ def from_dict(cls, db: dict[str, Any]) -> EmojiDatabase:
     def from_lines(cls, lines: Iterable[str]) -> EmojiDatabase:
         collection = cls()
         for line in lines:
-            if e := Emoji.from_line(line):
-                collection.emojis.append(e)
+            if emoji := Emoji.from_line(line):
+                collection.emojis.append(emoji)
                 continue
             if m := cls._re_version.fullmatch(line):
                 collection.version = m.group("version").strip()
@@ -179,11 +179,12 @@ def from_lines(cls, lines: Iterable[str]) -> EmojiDatabase:
                 continue
         return collection
 
-    def to_json(self, *, pretty: bool = False) -> str:
+    def to_json(self, *, pretty: bool = False, **kwargs: Any) -> str:
+        kwargs = kwargs.copy()
         if pretty:
-            kwargs: dict[str, Any] = {"indent": "\t"}
+            kwargs["indent"] = "\t"
         else:
-            kwargs = {"separators": (",", ":")}
+            kwargs["separators"] = (",", ":")
         return json.dumps(
             dict(asdict(self), generator_revision=DB_GENERATOR_REVISION),
             ensure_ascii=False,