diff --git a/crates/oxc_sourcemap/src/encode.rs b/crates/oxc_sourcemap/src/encode.rs
index 8feaad889..3ddd29c55 100644
--- a/crates/oxc_sourcemap/src/encode.rs
+++ b/crates/oxc_sourcemap/src/encode.rs
@@ -47,6 +47,12 @@ pub fn encode(sourcemap: &SourceMap) -> Result<String> {
             .map_err(Error::from)?;
         buf.push_str(&quote_source_contents.join(","));
     }
+    if let Some(x_google_ignore_list) = &sourcemap.x_google_ignore_list {
+        buf.push_str("],\"x_google_ignoreList\":[");
+        let x_google_ignore_list =
+            x_google_ignore_list.iter().map(ToString::to_string).collect::<Vec<_>>();
+        buf.push_str(&x_google_ignore_list.join(","));
+    }
     buf.push_str("],\"mappings\":\"");
     buf.push_str(&serialize_sourcemap_mappings(sourcemap));
     buf.push_str("\"}");
@@ -164,7 +170,7 @@ fn test_encode() {
 #[test]
 fn test_encode_escape_string() {
     // '\0' should be escaped.
-    let sm = SourceMap::new(
+    let mut sm = SourceMap::new(
         None,
         vec!["\0".into()],
         None,
@@ -173,8 +179,9 @@ fn test_encode_escape_string() {
         vec![],
         None,
     );
+    sm.set_x_google_ignore_list(vec![0]);
     assert_eq!(
         sm.to_json_string().unwrap(),
-        r#"{"version":3,"names":["\u0000"],"sources":["\u0000"],"sourcesContent":["\u0000"],"mappings":""}"#
+        r#"{"version":3,"names":["\u0000"],"sources":["\u0000"],"sourcesContent":["\u0000"],"x_google_ignoreList":[0],"mappings":""}"#
     );
 }
diff --git a/crates/oxc_sourcemap/src/sourcemap.rs b/crates/oxc_sourcemap/src/sourcemap.rs
index 9e9797b04..652e39063 100644
--- a/crates/oxc_sourcemap/src/sourcemap.rs
+++ b/crates/oxc_sourcemap/src/sourcemap.rs
@@ -16,6 +16,10 @@ pub struct SourceMap {
     pub(crate) source_contents: Option<Vec<Arc<str>>>,
     pub(crate) tokens: Vec<Token>,
     pub(crate) token_chunks: Option<Vec<TokenChunk>>,
+    /// Identifies third-party sources (such as framework code or bundler-generated code), allowing developers to avoid code that they don't want to see or step through, without having to configure this beforehand.
+    /// The `x_google_ignoreList` field refers to the `sources` array, and lists the indices of all the known third-party sources in that source map.
+    /// When parsing the source map, developer tools can use this to determine sections of the code that the browser loads and runs that could be automatically ignore-listed.
+    pub(crate) x_google_ignore_list: Option<Vec<u32>>,
 }
 
 #[allow(clippy::cast_possible_truncation)]
@@ -29,7 +33,16 @@ impl SourceMap {
         tokens: Vec<Token>,
         token_chunks: Option<Vec<TokenChunk>>,
     ) -> Self {
-        Self { file, names, source_root, sources, source_contents, tokens, token_chunks }
+        Self {
+            file,
+            names,
+            source_root,
+            sources,
+            source_contents,
+            tokens,
+            token_chunks,
+            x_google_ignore_list: None,
+        }
     }
 
     /// Convert `SourceMap` to vlq sourcemap string.
@@ -69,6 +82,11 @@ impl SourceMap {
         self.source_root.as_deref()
     }
 
+    /// Set `x_google_ignoreList`.
+    pub fn set_x_google_ignore_list(&mut self, x_google_ignore_list: Vec<u32>) {
+        self.x_google_ignore_list = Some(x_google_ignore_list);
+    }
+
     pub fn get_names(&self) -> impl Iterator<Item = &str> {
         self.names.iter().map(AsRef::as_ref)
     }