fix(transformer): JSX source: add var _jsxFileName statement (#5894)

Fix JSX source transform when run alone without main JSX transform.

The added test case is same as one of Babel's exec test cases, but the exec test fails due to `transformAsync` not being present.

crates/oxc_transformer/src/react/jsx_source.rs

@@ -59,6 +59,12 @@ impl<'a> ReactJsxSource<'a> {
 }
 
 impl<'a> Traverse<'a> for ReactJsxSource<'a> {
+    fn exit_program(&mut self, program: &mut Program<'a>, _ctx: &mut TraverseCtx<'a>) {
+        if let Some(stmt) = self.get_var_file_name_statement() {
+            program.body.insert(0, stmt);
+        }
+    }
+
     fn enter_jsx_opening_element(
         &mut self,
         elem: &mut JSXOpeningElement<'a>,

crates/oxc_transformer/src/react/mod.rs

@@ -84,6 +84,8 @@ impl<'a> Traverse<'a> for React<'a> {
         }
         if self.jsx_plugin {
             self.jsx.exit_program(program, ctx);
+        } else if self.jsx_source_plugin {
+            self.jsx.jsx_source.exit_program(program, ctx);
         }
     }
 

tasks/transform_conformance/oxc.snap.md

@@ -1,12 +1,13 @@
 commit: 3bcfee23
 
-Passed: 46/56
+Passed: 47/57
 
 # All Passed:
 * babel-plugin-transform-nullish-coalescing-operator
 * babel-plugin-transform-optional-catch-binding
 * babel-plugin-transform-arrow-functions
 * babel-preset-typescript
+* babel-plugin-transform-react-jsx-source
 * regexp
 
 

tasks/transform_conformance/tests/babel-plugin-transform-react-jsx-source/test/fixtures/react-source/basic-sample/input.jsx

@@ -0,0 +1 @@
+var x = <sometag />;

tasks/transform_conformance/tests/babel-plugin-transform-react-jsx-source/test/fixtures/react-source/basic-sample/output.jsx

@@ -0,0 +1,6 @@
+var _jsxFileName = "<CWD>/tests/babel-plugin-transform-react-jsx-source/test/fixtures/react-source/basic-sample/input.jsx";
+var x = <sometag __source={{
+  fileName: _jsxFileName,
+  lineNumber: 1,
+  columnNumber: 9
+}} />;

tasks/transform_conformance/tests/babel-plugin-transform-react-jsx-source/test/fixtures/react-source/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["syntax-jsx", "transform-react-jsx-source"]
+}