message: fix(swc): Respect `jsc.experimental.keepImportAssertions`
  swc:
  - Fix `Merge` impl of `JscExperimental`.
diff: @@ -985,8 +985,13 @@ pub struct JscExperimental {
  impl Merge for JscExperimental {
  fn merge(&mut self, from: &Self) {
  if self.plugins.is_none() {
  - *self = from.clone();
  + self.plugins = from.plugins.clone();
  + }
  + if self.cache_root.is_none() {
  + self.cache_root = from.cache_root.clone();
  }
  +
  + self.keep_import_assertions |= from.keep_import_assertions;
  }
  }
  