Fix hot reloading in canary (#3848)

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

2 files changed, 20 insertions, 0 deletions

diff --git a/src/bun.js/module_loader.zig b/src/bun.js/module_loader.zig
index 0e4cb5ba2..4763ed1bc 100644
--- a/src/bun.js/module_loader.zig
+++ b/src/bun.js/module_loader.zig
@@ -450,6 +450,25 @@ pub const RuntimeTranspilerStore = struct {
                 return;
             };
 
+            if (vm.isWatcherEnabled()) {
+                if (input_file_fd != 0) {
+                    if (vm.bun_watcher != null and !is_node_override and
+                        std.fs.path.isAbsolute(path.text) and !strings.contains(path.text, "node_modules"))
+                    {
+                        should_close_input_file_fd = false;
+                        vm.bun_watcher.?.addFile(
+                            input_file_fd,
+                            path.text,
+                            hash,
+                            loader,
+                            0,
+                            package_json,
+                            true,
+                        ) catch {};
+                    }
+                }
+            }
+
             for (parse_result.ast.import_records.slice()) |*import_record_| {
                 var import_record: *bun.ImportRecord = import_record_;
 
diff --git a/src/watcher.zig b/src/watcher.zig
index 9bc61b3af..a31267c5f 100644
--- a/src/watcher.zig
+++ b/src/watcher.zig
@@ -693,6 +693,7 @@ pub fn NewWatcher(comptime ContextType: type) type {
             package_json: ?*PackageJSON,
             comptime copy_file_path: bool,
         ) !void {
+            // This must lock due to concurrent transpiler
             this.mutex.lock();
             defer this.mutex.unlock();