fix: pass empty "" children value on self closing function element

Author: danielpza

src/index.test.ts

@@ -146,7 +146,7 @@ const type = "number";
       `\
 function LabeledInput(props) { return (\`<input type="\${type}"></input>\`); }
 const type = "number";
-LabeledInput({ type: type });
+LabeledInput({ type: type, children: "" });
 `
     );
   });

src/index.ts

@@ -118,6 +118,9 @@ const transformer = <T extends ts.Node>(context: ts.TransformationContext) => (
     const parameters = node.attributes.properties.map(
       getObjectLiteralElementFromAttribute
     );
+    parameters.push(
+      ts.createPropertyAssignment("children", ts.createLiteral(""))
+    );
     result.add(
       ts.createCall(node.tagName, [], [ts.createObjectLiteral(parameters)])
     );