Fix preset-env helpers injection

Author: marcins

packages/transformers/js/core/src/lib.rs

@@ -480,18 +480,27 @@ pub fn transform(
 
                   // Transpile new syntax to older syntax if needed
                   Optional::new(
-                    preset_env::transform_from_env(
-                      unresolved_mark,
-                      Some(&comments),
-                      // Fix type: convert Config to EnvConfig
-                      preset_env::EnvConfig::from(preset_env_config),
-                      assumptions
+                    // This repeats what's at the top level scope, but it seems when bumping SWC
+                    // we need to explicitly set it closer to the use of preset_env as well
+                    helpers::HELPERS.set(
+                      &helpers::Helpers::new(
+                        should_import_swc_helpers
+                      ),
+                      || {
+                        preset_env::transform_from_env(
+                          unresolved_mark,
+                          Some(&comments),
+                          preset_env::EnvConfig::from(preset_env_config),
+                          assumptions
+                        )
+                      }
                     ),
                     should_run_preset_env,
                   ),
 
-                  // Inject SWC helpers if needed.
-                  helpers::inject_helpers(global_mark),
+                  // Inject SWC helpers if needed
+                    helpers::inject_helpers(global_mark),
+
 
                   // Flush Id=(JsWord, SyntaxContexts) into unique names and reresolve to set
                   // global_mark for all nodes, even generated ones.