From 66ed8ed595d34f7c01729d54dddd044e9892658a Mon Sep 17 00:00:00 2001
From: overlookmotel <theoverlookmotel@gmail.com>
Date: Mon, 10 Jun 2024 17:33:27 +0100
Subject: [PATCH] fix(transformer): do not add `__source` for generated nodes

---
 crates/oxc_span/src/span.rs                    | 15 +++++++++++++++
 crates/oxc_transformer/src/react/jsx_source.rs |  5 +++++
 2 files changed, 20 insertions(+)

diff --git a/crates/oxc_span/src/span.rs b/crates/oxc_span/src/span.rs
index 0ae456649e76ab..eeae24a3d3f357 100644
--- a/crates/oxc_span/src/span.rs
+++ b/crates/oxc_span/src/span.rs
@@ -118,6 +118,21 @@ impl Span {
         self.start == self.end
     }
 
+    /// Returns `true` if `self` is not a real span.
+    /// i.e. `SPAN` which is used for generated nodes which are not in source code.
+    ///
+    /// # Example
+    /// ```
+    /// use oxc_span::{Span, SPAN};
+    ///
+    /// assert!(SPAN.is_unspanned());
+    /// assert!(!Span::new(0, 5).is_unspanned());
+    /// assert!(!Span::new(5, 5).is_unspanned());
+    /// ```
+    pub const fn is_unspanned(&self) -> bool {
+        self.start == SPAN.start && self.end == SPAN.end
+    }
+
     /// Create a [`Span`] covering the maximum range of two [`Span`]s.
     ///
     /// # Example
diff --git a/crates/oxc_transformer/src/react/jsx_source.rs b/crates/oxc_transformer/src/react/jsx_source.rs
index 2703476d9ffc09..fd553837bf05e1 100644
--- a/crates/oxc_transformer/src/react/jsx_source.rs
+++ b/crates/oxc_transformer/src/react/jsx_source.rs
@@ -65,6 +65,11 @@ impl<'a> ReactJsxSource<'a> {
         elem: &mut JSXOpeningElement<'a>,
         ctx: &mut TraverseCtx<'a>,
     ) {
+        // Don't add `__source` if this node was generated
+        if elem.span.is_unspanned() {
+            return;
+        }
+
         // Check if `__source` attribute already exists
         for item in &elem.attributes {
             if let JSXAttributeItem::Attribute(attribute) = item {