refactor(transformer): wrap_statements_in_arrow_function_iife utili…

…ty function (#8548)

Move utility function for creating an IIFE from `ClassStaticBlock` transform to utils module.

crates/oxc_transformer/src/es2022/class_properties/static_block_and_prop_init.rs

@@ -7,10 +7,12 @@ use oxc_ast::{
     ast::*,
     visit::{walk_mut, VisitMut},
 };
+use oxc_span::SPAN;
 use oxc_syntax::scope::{ScopeFlags, ScopeId};
 use oxc_traverse::TraverseCtx;
 
-use super::super::ClassStaticBlock;
+use crate::utils::ast_builder::wrap_statements_in_arrow_function_iife;
+
 use super::{
     super_converter::{ClassPropertiesSuperConverter, ClassPropertiesSuperConverterMode},
     ClassProperties,
@@ -88,7 +90,7 @@ impl<'a> ClassProperties<'a, '_> {
         let outer_scope_id = ctx.current_scope_id();
         ctx.scopes_mut().change_parent_id(scope_id, Some(outer_scope_id));
 
-        ClassStaticBlock::wrap_statements_in_iife(stmts, scope_id, ctx)
+        wrap_statements_in_arrow_function_iife(ctx.ast.move_vec(stmts), scope_id, SPAN, ctx)
     }
 
     fn convert_static_block_with_single_expression_to_expression(

crates/oxc_transformer/src/es2022/class_static_block.rs

@@ -41,12 +41,14 @@
 
 use itoa::Buffer as ItoaBuffer;
 
-use oxc_allocator::{String as ArenaString, Vec as ArenaVec};
+use oxc_allocator::String as ArenaString;
 use oxc_ast::{ast::*, NONE};
 use oxc_span::SPAN;
 use oxc_syntax::scope::{ScopeFlags, ScopeId};
 use oxc_traverse::{Traverse, TraverseCtx};
 
+use crate::utils::ast_builder::wrap_statements_in_arrow_function_iife;
+
 pub struct ClassStaticBlock;
 
 impl ClassStaticBlock {
@@ -157,32 +159,7 @@ impl ClassStaticBlock {
         // Always strict mode since we're in a class.
         *ctx.scopes_mut().get_flags_mut(scope_id) =
             ScopeFlags::Function | ScopeFlags::Arrow | ScopeFlags::StrictMode;
-
-        Self::wrap_statements_in_iife(stmts, scope_id, ctx)
-    }
-
-    /// Wrap statements in an IIFE.
-    ///
-    /// This function also used by `ClassProperties` transform.
-    pub(super) fn wrap_statements_in_iife<'a>(
-        stmts: &mut ArenaVec<'a, Statement<'a>>,
-        scope_id: ScopeId,
-        ctx: &mut TraverseCtx<'a>,
-    ) -> Expression<'a> {
-        let stmts = ctx.ast.move_vec(stmts);
-        let params = ctx.ast.alloc_formal_parameters(
-            SPAN,
-            FormalParameterKind::ArrowFormalParameters,
-            ctx.ast.vec(),
-            NONE,
-        );
-        let body = ctx.ast.alloc_function_body(SPAN, ctx.ast.vec(), stmts);
-        let arrow = Expression::ArrowFunctionExpression(
-            ctx.ast.alloc_arrow_function_expression_with_scope_id(
-                SPAN, false, false, NONE, params, NONE, body, scope_id,
-            ),
-        );
-        ctx.ast.expression_call(SPAN, arrow, NONE, ctx.ast.vec(), false)
+        wrap_statements_in_arrow_function_iife(ctx.ast.move_vec(stmts), scope_id, SPAN, ctx)
     }
 
     /// Convert static block to expression which will be value of private field,

crates/oxc_transformer/src/utils/ast_builder.rs

@@ -1,5 +1,6 @@
+use oxc_allocator::Vec as ArenaVec;
 use oxc_ast::{ast::*, NONE};
-use oxc_semantic::ScopeFlags;
+use oxc_semantic::{ScopeFlags, ScopeId};
 use oxc_span::{GetSpan, SPAN};
 use oxc_traverse::TraverseCtx;
 
@@ -40,28 +41,33 @@ pub(crate) fn create_call_call<'a>(
 /// Wrap an `Expression` in an arrow function IIFE (immediately invoked function expression)
 /// with a body block.
 ///
-/// `expr` ->  `(() => { return expr; })()`
+/// `expr` -> `(() => { return expr; })()`
 pub(crate) fn wrap_expression_in_arrow_function_iife<'a>(
     expr: Expression<'a>,
     ctx: &mut TraverseCtx<'a>,
 ) -> Expression<'a> {
     let scope_id =
         ctx.insert_scope_below_expression(&expr, ScopeFlags::Arrow | ScopeFlags::Function);
-
     let span = expr.span();
+    let stmts = ctx.ast.vec1(ctx.ast.statement_return(SPAN, Some(expr)));
+    wrap_statements_in_arrow_function_iife(stmts, scope_id, span, ctx)
+}
+
+/// Wrap statements in an IIFE (immediately invoked function expression).
+///
+/// `x; y; z;` -> `(() => { x; y; z; })()`
+pub(crate) fn wrap_statements_in_arrow_function_iife<'a>(
+    stmts: ArenaVec<'a, Statement<'a>>,
+    scope_id: ScopeId,
+    span: Span,
+    ctx: &mut TraverseCtx<'a>,
+) -> Expression<'a> {
     let kind = FormalParameterKind::ArrowFormalParameters;
-    let params = ctx.ast.formal_parameters(SPAN, kind, ctx.ast.vec(), NONE);
-    let statements = ctx.ast.vec1(ctx.ast.statement_return(SPAN, Some(expr)));
-    let body = ctx.ast.function_body(SPAN, ctx.ast.vec(), statements);
-    let arrow = ctx.ast.alloc_arrow_function_expression_with_scope_id(
-        SPAN, false, false, NONE, params, NONE, body, scope_id,
-    );
-    // IIFE
-    ctx.ast.expression_call(
-        span,
-        Expression::ArrowFunctionExpression(arrow),
-        NONE,
-        ctx.ast.vec(),
-        false,
-    )
+    let params = ctx.ast.alloc_formal_parameters(SPAN, kind, ctx.ast.vec(), NONE);
+    let body = ctx.ast.alloc_function_body(SPAN, ctx.ast.vec(), stmts);
+    let arrow =
+        Expression::ArrowFunctionExpression(ctx.ast.alloc_arrow_function_expression_with_scope_id(
+            SPAN, false, false, NONE, params, NONE, body, scope_id,
+        ));
+    ctx.ast.expression_call(span, arrow, NONE, ctx.ast.vec(), false)
 }