API for object rest spread

Author: kdy1

crates/swc_ecma_transformer/src/es2018/mod.rs

@@ -1,17 +1,23 @@
 use swc_ecma_hooks::VisitMutHook;
+use swc_ecma_transforms_base::assumptions::Assumptions;
 
-use crate::TraverseCtx;
+use crate::{hook_utils::OptionalHook, TraverseCtx};
+
+mod object_rest_spread;
 
 #[derive(Debug, Default)]
 #[non_exhaustive]
-pub struct Es2018Options {}
-
-pub fn hook(options: Es2018Options) -> impl VisitMutHook<TraverseCtx> {
-    Es2018Pass { options }
+pub struct Es2018Options {
+    pub object_rest_spread: bool,
 }
 
-struct Es2018Pass {
+pub(crate) fn hook(
     options: Es2018Options,
+    assumptions: Assumptions,
+) -> impl VisitMutHook<TraverseCtx> {
+    OptionalHook(if options.object_rest_spread {
+        Some(self::object_rest_spread::hook(assumptions))
+    } else {
+        None
+    })
 }
-
-impl VisitMutHook<TraverseCtx> for Es2018Pass {}

crates/swc_ecma_transformer/src/es2018/object_rest_spread.rs

@@ -0,0 +1,12 @@
+use swc_ecma_hooks::VisitMutHook;
+use swc_ecma_transforms_base::assumptions::Assumptions;
+
+use crate::TraverseCtx;
+
+pub fn hook(assumptions: Assumptions) -> impl VisitMutHook<TraverseCtx> {
+    ObjectRestSpreadPass {}
+}
+
+struct ObjectRestSpreadPass {}
+
+impl VisitMutHook<TraverseCtx> for ObjectRestSpreadPass {}

crates/swc_ecma_transformer/src/lib.rs

@@ -43,7 +43,7 @@ pub fn transform_hook(options: Options) -> impl VisitMutHook<TraverseCtx> {
     let hook = hook.chain(crate::es2021::hook(options.env.es2021));
     let hook = hook.chain(crate::es2020::hook(options.env.es2020));
     let hook = hook.chain(crate::es2019::hook(options.env.es2019));
-    let hook = hook.chain(crate::es2018::hook(options.env.es2018));
+    let hook = hook.chain(crate::es2018::hook(options.env.es2018, options.assumptions));
     let hook = hook.chain(crate::es2017::hook(
         options.unresolved_ctxt,
         options.env.es2017,