refactor(es/typescript): Extract type annotation proposal out (#9127)

**Description:**

The Node.js team wants a Wasm package that only implements type annotation proposals. So, we need to refactor our TypeScript transform to allow it.


**Related issue:**

 - nodejs/loaders#208 (comment)

Author: kdy1

bindings/binding_typescript_wasm/src/lib.rs

@@ -11,11 +11,14 @@ use swc_core::{
         parser::{
             parse_file_as_module, parse_file_as_program, parse_file_as_script, Syntax, TsSyntax,
         },
-        transforms::base::{
-            fixer::fixer,
-            helpers::{inject_helpers, Helpers, HELPERS},
-            hygiene::hygiene,
-            resolver,
+        transforms::{
+            base::{
+                fixer::fixer,
+                helpers::{inject_helpers, Helpers, HELPERS},
+                hygiene::hygiene,
+                resolver,
+            },
+            typescript::strip_type,
         },
         visit::VisitMutWith,
     },
@@ -52,9 +55,8 @@ pub struct Options {
     #[serde(default)]
     pub source_maps: bool,
 
-    #[serde(default)]
-    pub transform: swc_core::ecma::transforms::typescript::Config,
-
+    // #[serde(default)]
+    // pub transform: swc_core::ecma::transforms::typescript::Config,
     #[serde(default)]
     pub codegen: swc_core::ecma::codegen::Config,
 }
@@ -148,10 +150,7 @@ fn operate(input: String, options: Options) -> Result<TransformOutput, Error> {
 
                 // Strip typescript types
 
-                program.visit_mut_with(&mut swc_core::ecma::transforms::typescript::typescript(
-                    options.transform,
-                    top_level_mark,
-                ));
+                program.visit_mut_with(&mut strip_type());
 
                 // Apply external helpers
 

crates/swc_ecma_transforms_typescript/src/lib.rs

@@ -2,7 +2,7 @@
 #![allow(clippy::vec_box)]
 #![allow(clippy::mutable_key_type)]
 
-pub use self::typescript::*;
+pub use self::{strip_type::*, typescript::*};
 mod config;
 mod macros;
 mod strip_import_export;

crates/swc_ecma_transforms_typescript/src/strip_type.rs

@@ -5,6 +5,10 @@ use swc_ecma_visit::{VisitMut, VisitMutWith};
 
 use crate::{type_to_none, unreachable_visit_mut_type};
 
+pub fn strip_type() -> impl VisitMut {
+    StripType::default()
+}
+
 /// This Module will strip all types/generics/interface/declares
 /// and type import/export
 #[derive(Default)]