refactor(transformer): use TraverseCtx's ast in ModuleImports (#6175)

close: #6173

crates/oxc_transformer/src/context.rs

@@ -62,7 +62,7 @@ impl<'a> TransformCtx<'a> {
             source_type,
             source_text,
             trivias,
-            module_imports: ModuleImports::new(allocator),
+            module_imports: ModuleImports::new(),
             var_declarations: VarDeclarationsStore::new(),
         }
     }

crates/oxc_transformer/src/helpers/module_imports.rs

@@ -1,8 +1,8 @@
 use std::cell::RefCell;
 
 use indexmap::IndexMap;
-use oxc_allocator::{Allocator, Vec};
-use oxc_ast::{ast::*, AstBuilder, NONE};
+use oxc_allocator::Vec;
+use oxc_ast::{ast::*, NONE};
 use oxc_semantic::ReferenceFlags;
 use oxc_span::{Atom, SPAN};
 use oxc_syntax::symbol::SymbolId;
@@ -41,15 +41,12 @@ impl<'a> ImportType<'a> {
 /// Manage import statement globally
 /// <https://github.com/nicolo-ribaudo/babel/tree/main/packages/babel-helper-module-imports>
 pub struct ModuleImports<'a> {
-    ast: AstBuilder<'a>,
-
     imports: RefCell<IndexMap<ImportType<'a>, std::vec::Vec<NamedImport<'a>>>>,
 }
 
 impl<'a> ModuleImports<'a> {
-    pub fn new(allocator: &'a Allocator) -> ModuleImports<'a> {
-        let ast = AstBuilder::new(allocator);
-        Self { ast, imports: RefCell::new(IndexMap::default()) }
+    pub fn new() -> ModuleImports<'a> {
+        Self { imports: RefCell::new(IndexMap::default()) }
     }
 
     /// Add `import { named_import } from 'source'`
@@ -75,40 +72,39 @@ impl<'a> ModuleImports<'a> {
     }
 
     pub fn get_import_statements(&self, ctx: &mut TraverseCtx<'a>) -> Vec<'a, Statement<'a>> {
-        self.ast.vec_from_iter(self.imports.borrow_mut().drain(..).map(|(import_type, names)| {
+        ctx.ast.vec_from_iter(self.imports.borrow_mut().drain(..).map(|(import_type, names)| {
             match import_type.kind {
-                ImportKind::Import => self.get_named_import(import_type.source, names),
-                ImportKind::Require => self.get_require(import_type.source, names, ctx),
+                ImportKind::Import => Self::get_named_import(import_type.source, names, ctx),
+                ImportKind::Require => Self::get_require(import_type.source, names, ctx),
             }
         }))
     }
 
     fn get_named_import(
-        &self,
         source: Atom<'a>,
         names: std::vec::Vec<NamedImport<'a>>,
+        ctx: &mut TraverseCtx<'a>,
     ) -> Statement<'a> {
-        let specifiers = self.ast.vec_from_iter(names.into_iter().map(|name| {
+        let specifiers = ctx.ast.vec_from_iter(names.into_iter().map(|name| {
             let local = name.local.unwrap_or_else(|| name.imported.clone());
-            ImportDeclarationSpecifier::ImportSpecifier(self.ast.alloc_import_specifier(
+            ImportDeclarationSpecifier::ImportSpecifier(ctx.ast.alloc_import_specifier(
                 SPAN,
                 ModuleExportName::IdentifierName(IdentifierName::new(SPAN, name.imported)),
                 BindingIdentifier::new_with_symbol_id(SPAN, local, name.symbol_id),
                 ImportOrExportKind::Value,
             ))
         }));
-        let import_stmt = self.ast.module_declaration_import_declaration(
+        let import_stmt = ctx.ast.module_declaration_import_declaration(
             SPAN,
             Some(specifiers),
             StringLiteral::new(SPAN, source),
             NONE,
             ImportOrExportKind::Value,
         );
-        self.ast.statement_module_declaration(import_stmt)
+        ctx.ast.statement_module_declaration(import_stmt)
     }
 
     fn get_require(
-        &self,
         source: Atom<'a>,
         names: std::vec::Vec<NamedImport<'a>>,
         ctx: &mut TraverseCtx<'a>,
@@ -117,27 +113,27 @@ impl<'a> ModuleImports<'a> {
         let symbol_id = ctx.scopes().get_root_binding("require");
         let ident =
             ctx.create_reference_id(SPAN, Atom::from("require"), symbol_id, ReferenceFlags::read());
-        let callee = self.ast.expression_from_identifier_reference(ident);
+        let callee = ctx.ast.expression_from_identifier_reference(ident);
 
         let args = {
-            let arg = Argument::from(self.ast.expression_string_literal(SPAN, source));
-            self.ast.vec1(arg)
+            let arg = Argument::from(ctx.ast.expression_string_literal(SPAN, source));
+            ctx.ast.vec1(arg)
         };
         let name = names.into_iter().next().unwrap();
         let id = {
             let ident = BindingIdentifier::new_with_symbol_id(SPAN, name.imported, name.symbol_id);
-            self.ast.binding_pattern(
-                self.ast.binding_pattern_kind_from_binding_identifier(ident),
+            ctx.ast.binding_pattern(
+                ctx.ast.binding_pattern_kind_from_binding_identifier(ident),
                 NONE,
                 false,
             )
         };
         let decl = {
-            let init = self.ast.expression_call(SPAN, callee, NONE, args, false);
-            let decl = self.ast.variable_declarator(SPAN, var_kind, id, Some(init), false);
-            self.ast.vec1(decl)
+            let init = ctx.ast.expression_call(SPAN, callee, NONE, args, false);
+            let decl = ctx.ast.variable_declarator(SPAN, var_kind, id, Some(init), false);
+            ctx.ast.vec1(decl)
         };
-        let var_decl = self.ast.declaration_variable(SPAN, var_kind, decl, false);
-        self.ast.statement_declaration(var_decl)
+        let var_decl = ctx.ast.declaration_variable(SPAN, var_kind, decl, false);
+        ctx.ast.statement_declaration(var_decl)
     }
 }