external helpers

Author: kdy1

crates/swc_ecma_preset_env/src/lib.rs

@@ -11,7 +11,7 @@ use serde::Deserialize;
 use swc_atoms::{atom, Atom};
 use swc_common::{comments::Comments, pass::Optional, FromVariant, Mark, SyntaxContext, DUMMY_SP};
 use swc_ecma_ast::*;
-use swc_ecma_compiler::compat::{CompatCompiler, TransformOptions};
+use swc_ecma_compiler::compat::{CompatCompiler, HelperLoaderMode, TransformOptions};
 use swc_ecma_transforms::{
     compat::{
         bugfixes,
@@ -51,6 +51,7 @@ where
 {
     let pass = noop_pass();
     let mut compiler_options = TransformOptions::default();
+    compiler_options.helper_loader.mode = HelperLoaderMode::Runtime;
 
     macro_rules! add {
         ($prev:expr, $feature:ident, $pass:expr) => {{