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fix(transformer/class-properties): output is not the same with Babel when callee has optional #7748

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Dec 10, 2024
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fix(transformer/class-properties): output is not the same with Babel when callee has optional #7748

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39 changes: 27 additions & 12 deletions crates/oxc_transformer/src/es2022/class_properties/private.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1299,22 +1299,37 @@ impl<'a, 'ctx> ClassProperties<'a, 'ctx> {
) -> Expression<'a> {
let Expression::CallExpression(call) = expr else { unreachable!() };

let callee = &mut call.callee;
// `Foo?.bar()?.zoo?.()`
// ^^^^^^^^^^^^^^^^^ callee is a member expression
// ^^^^^^^^^^^ object
let object = callee.to_member_expression_mut().object_mut();
// ^^^^^^^^^^^^^^^^^ callee is a member expression
let callee = &mut call.callee;
let callee_member = callee.to_member_expression_mut();
let is_optional_callee = callee_member.optional();
let object = callee_member.object_mut();

let context = if let Some(result) = self.transform_chain_element_recursively(object, ctx) {
// `o?.Foo.#self.getSelf?.().#m?.();` -> `(_ref = o === null || o === void 0 ? void 0 : (_babelHelpers$assertC =
// babelHelpers.assertClassBrand(Foo, o.Foo, _self)._).getSelf)`
// ^^^^^^^^^^^^^^^^^^^^^^ to make sure get `getSelf` call has a proper context, we need to assign
// the parent of callee (i.e `o?.Foo.#self`) to a temp variable,
// and then use it as a first argument of `_ref.call`.
let (assignment, context) = self.duplicate_object(ctx.ast.move_expression(object), ctx);
*object = assignment;
*callee = Self::wrap_conditional_check(result, ctx.ast.move_expression(callee), ctx);
context
if is_optional_callee {
// `o?.Foo.#self?.getSelf?.().#x;` -> `(_ref$getSelf = (_ref2 = _ref = o === null || o === void 0 ?
// ^^ is optional void 0 : babelHelpers.assertClassBrand(Foo, o.Foo, _self)._)`
*object =
Self::wrap_conditional_check(result, ctx.ast.move_expression(object), ctx);
let (assignment, context) =
self.duplicate_object(ctx.ast.move_expression(object), ctx);
*object = assignment;
context
} else {
// `o?.Foo.#self.getSelf?.().#m?.();` -> `(_ref = o === null || o === void 0 ? void 0 : (_babelHelpers$assertC =
// babelHelpers.assertClassBrand(Foo, o.Foo, _self)._).getSelf)`
// ^^^^^^^^^^^^^^^^^^^^^^ to make sure get `getSelf` call has a proper context, we need to assign
// the parent of callee (i.e `o?.Foo.#self`) to a temp variable,
// and then use it as a first argument of `_ref.call`.
let (assignment, context) =
self.duplicate_object(ctx.ast.move_expression(object), ctx);
*object = assignment;
*callee =
Self::wrap_conditional_check(result, ctx.ast.move_expression(callee), ctx);
context
}
} else {
// `Foo?.bar()?.zoo?.().#x;` -> `(_Foo$bar$zoo = (_Foo$bar = Foo?.bar())?.zoo)`
// ^^^^^^^^^^^^^^^^ this is a optional function call, to make sure it has a proper context,
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