fix(transformer/class-properties): transform this in static prop initializers (#7481)

Convert `this` in static property initializers to reference to class name.

`class C { static prop = this; }` -> `class C {}; C.prop = C;`

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

@@ -444,9 +444,12 @@ impl<'a, 'ctx> ClassProperties<'a, 'ctx> {
         prop: &mut PropertyDefinition<'a>,
         ctx: &mut TraverseCtx<'a>,
     ) {
-        // Get value
+        // Get value, and transform it to replace `this` with reference to class name
         let value = match &mut prop.value {
-            Some(value) => ctx.ast.move_expression(value),
+            Some(value) => {
+                self.transform_static_initializer(value, ctx);
+                ctx.ast.move_expression(value)
+            }
             None => ctx.ast.void_0(SPAN),
         };
 

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

@@ -155,6 +155,7 @@ use crate::TransformCtx;
 mod class;
 mod constructor;
 mod private;
+mod static_prop;
 mod utils;
 
 type FxIndexMap<K, V> = IndexMap<K, V, BuildHasherDefault<FxHasher>>;

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

@@ -0,0 +1,115 @@
+//! ES2022: Class Properties
+//! Transform of static property initializers.
+
+use oxc_ast::{
+    ast::*,
+    visit::{walk_mut, VisitMut},
+};
+use oxc_syntax::scope::ScopeFlags;
+use oxc_traverse::{BoundIdentifier, TraverseCtx};
+
+use super::{ClassName, ClassProperties};
+
+impl<'a, 'ctx> ClassProperties<'a, 'ctx> {
+    /// Transform any `this` in static property initializer to reference to class name.
+    pub(super) fn transform_static_initializer(
+        &mut self,
+        value: &mut Expression<'a>,
+        ctx: &mut TraverseCtx<'a>,
+    ) {
+        // TODO: Insert temp var if class binding is mutated.
+
+        let ClassName::Binding(class_name_binding) = &self.class_name else {
+            // Binding is initialized in 1st pass in `transform_class` when a static prop is found
+            unreachable!();
+        };
+
+        let mut replacer = StaticInitializerVisitor::new(class_name_binding, ctx);
+        replacer.visit_expression(value);
+    }
+}
+
+struct StaticInitializerVisitor<'a, 'v> {
+    class_name_binding: &'v BoundIdentifier<'a>,
+    ctx: &'v mut TraverseCtx<'a>,
+}
+
+impl<'a, 'v> StaticInitializerVisitor<'a, 'v> {
+    fn new(class_name_binding: &'v BoundIdentifier<'a>, ctx: &'v mut TraverseCtx<'a>) -> Self {
+        Self { class_name_binding, ctx }
+    }
+}
+
+impl<'a, 'v> VisitMut<'a> for StaticInitializerVisitor<'a, 'v> {
+    #[inline]
+    fn visit_expression(&mut self, expr: &mut Expression<'a>) {
+        match expr {
+            Expression::ThisExpression(this_expr) => {
+                let span = this_expr.span;
+                self.replace_this_with_class_name(expr, span);
+                return;
+            }
+            Expression::UnaryExpression(unary_expr) => {
+                if unary_expr.operator == UnaryOperator::Delete
+                    && matches!(&unary_expr.argument, Expression::ThisExpression(_))
+                {
+                    let span = unary_expr.span;
+                    self.replace_delete_this_with_true(expr, span);
+                    return;
+                }
+            }
+            _ => {}
+        }
+
+        walk_mut::walk_expression(self, expr);
+    }
+
+    // Stop traversing where scope of current `this` ends
+    #[inline]
+    fn visit_function(&mut self, _func: &mut Function<'a>, _flags: ScopeFlags) {}
+
+    #[inline]
+    fn visit_static_block(&mut self, _block: &mut StaticBlock) {}
+
+    #[inline]
+    fn visit_ts_module_block(&mut self, _block: &mut TSModuleBlock<'a>) {}
+
+    #[inline]
+    fn visit_property_definition(&mut self, prop: &mut PropertyDefinition<'a>) {
+        // `this` in computed key of property or method refers to `this` of parent class.
+        // So visit computed `key`, but not `value`.
+        // ```js
+        // class Outer {
+        //   static prop = class Inner { [this] = 1; };
+        // }
+        // ```
+        // Don't visit `type_annotation` field because can't contain `this`.
+        // TODO: Are decorators in scope?
+        self.visit_decorators(&mut prop.decorators);
+        if prop.computed {
+            self.visit_property_key(&mut prop.key);
+        }
+    }
+
+    #[inline]
+    fn visit_accessor_property(&mut self, prop: &mut AccessorProperty<'a>) {
+        // Visit computed `key` but not `value`, for same reasons as `visit_property_definition` above.
+        // TODO: Are decorators in scope?
+        self.visit_decorators(&mut prop.decorators);
+        if prop.computed {
+            self.visit_property_key(&mut prop.key);
+        }
+    }
+}
+
+impl<'a, 'v> StaticInitializerVisitor<'a, 'v> {
+    /// Replace `this` with reference to class name binding.
+    fn replace_this_with_class_name(&mut self, expr: &mut Expression<'a>, span: Span) {
+        *expr = self.class_name_binding.create_spanned_read_expression(span, self.ctx);
+    }
+
+    /// Replace `delete this` with `true`.
+    fn replace_delete_this_with_true(&self, expr: &mut Expression<'a>, span: Span) {
+        *expr = self.ctx.ast.expression_boolean_literal(span, true);
+    }
+}

tasks/transform_conformance/snapshots/babel.snap.md

@@ -1,6 +1,6 @@
 commit: 54a8389f
 
-Passed: 405/846
+Passed: 406/846
 
 # All Passed:
 * babel-plugin-transform-class-static-block
@@ -276,7 +276,7 @@ x Output mismatch
 x Output mismatch
 
 
-# babel-plugin-transform-class-properties (78/264)
+# babel-plugin-transform-class-properties (79/264)
 * assumption-constantSuper/complex-super-class/input.js
 x Output mismatch
 
@@ -791,9 +791,6 @@ x Output mismatch
 * public/delete-super-property/input.js
 x Output mismatch
 
-* public/delete-this/input.js
-x Output mismatch
-
 * public/derived-multiple-supers/input.js
 x Output mismatch
 

tasks/transform_conformance/snapshots/babel_exec.snap.md

@@ -291,165 +291,20 @@ Received: "_Class"
 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[57/98]⎯
 
  FAIL  fixtures/babel-plugin-transform-class-properties-test-fixtures-assumption-setPublicClassFields-static-this-exec.test.js > exec
-AssertionError: expected { Object: [Function Object], …(133), …(6) } to be [Function A] // Object.is equality
+AssertionError: expected null to be [Function A] // Object.is equality
 
 - Expected: 
 [Function A]
 
 + Received: 
-Object {
+null
-  "__vitest_environment__": "node",
-  "__vitest_required__": Object {
-    "timers": Object {
-      "_unrefActive": [Function deprecated],
-      "active": [Function deprecated],
-      "clearImmediate": [Function clearImmediate],
-      "clearInterval": [Function clearInterval],
-      "clearTimeout": [Function clearTimeout],
-      "enroll": [Function deprecated],
-      "promises": Object {
-        "scheduler": Scheduler {
-          Symbol(kScheduler): true,
-        },
-        "setImmediate": [Function setImmediate],
-        "setInterval": [Function setInterval],
-        "setTimeout": [Function setTimeout],
-      },
-      "setImmediate": [Function setImmediate],
-      "setInterval": [Function setInterval],
-      "setTimeout": [Function setTimeout],
-      "unenroll": [Function deprecated],
-    },
-    "util": Object {
-      "MIMEParams": [Function MIMEParams],
-      "MIMEType": [Function MIMEType],
-      "TextDecoder": [Function TextDecoder],
-      "TextEncoder": [Function TextEncoder],
-      "_errnoException": [Function _errnoException],
-      "_exceptionWithHostPort": [Function _exceptionWithHostPort],
-      "_extend": [Function deprecated],
-      "aborted": [Function aborted],
-      "callbackify": [Function callbackify],
-      "debug": [Function debuglog],
-      "debuglog": [Function debuglog],
-      "deprecate": [Function deprecate],
-      "format": [Function format],
-      "formatWithOptions": [Function formatWithOptions],
-      "getCallSite": [Function getCallSite],
-      "getSystemErrorMap": [Function getSystemErrorMap],
-      "getSystemErrorName": [Function getSystemErrorName],
-      "inherits": [Function inherits],
-      "inspect": [Function inspect],
-      "isArray": [Function deprecated],
-      "isBoolean": [Function deprecated],
-      "isBuffer": [Function deprecated],
-      "isDate": [Function deprecated],
-      "isDeepStrictEqual": [Function isDeepStrictEqual],
-      "isError": [Function deprecated],
-      "isFunction": [Function deprecated],
-      "isNull": [Function deprecated],
-      "isNullOrUndefined": [Function deprecated],
-      "isNumber": [Function deprecated],
-      "isObject": [Function deprecated],
-      "isPrimitive": [Function deprecated],
-      "isRegExp": [Function deprecated],
-      "isString": [Function deprecated],
-      "isSymbol": [Function deprecated],
-      "isUndefined": [Function deprecated],
-      "log": [Function deprecated],
-      "parseArgs": [Function parseArgs],
-      "parseEnv": [Function parseEnv],
-      "promisify": [Function promisify],
-      "stripVTControlCharacters": [Function stripVTControlCharacters],
-      "styleText": [Function styleText],
-      "toUSVString": [Function toUSVString],
-      "transferableAbortController": [Function transferableAbortController],
-      "transferableAbortSignal": [Function transferableAbortSignal],
-      "types": Object {
-        "isAnyArrayBuffer": [Function isAnyArrayBuffer],
-        "isArgumentsObject": [Function isArgumentsObject],
-        "isArrayBuffer": [Function isArrayBuffer],
-        "isArrayBufferView": [Function isView],
-        "isAsyncFunction": [Function isAsyncFunction],
-        "isBigInt64Array": [Function isBigInt64Array],
-        "isBigIntObject": [Function isBigIntObject],
-        "isBigUint64Array": [Function isBigUint64Array],
-        "isBooleanObject": [Function isBooleanObject],
-        "isBoxedPrimitive": [Function isBoxedPrimitive],
-        "isCryptoKey": [Function value],
-        "isDataView": [Function isDataView],
-        "isDate": [Function isDate],
-        "isExternal": [Function isExternal],
-        "isFloat32Array": [Function isFloat32Array],
-        "isFloat64Array": [Function isFloat64Array],
-        "isGeneratorFunction": [Function isGeneratorFunction],
-        "isGeneratorObject": [Function isGeneratorObject],
-        "isInt16Array": [Function isInt16Array],
-        "isInt32Array": [Function isInt32Array],
-        "isInt8Array": [Function isInt8Array],
-        "isKeyObject": [Function value],
-        "isMap": [Function isMap],
-        "isMapIterator": [Function isMapIterator],
-        "isModuleNamespaceObject": [Function isModuleNamespaceObject],
-        "isNativeError": [Function isNativeError],
-        "isNumberObject": [Function isNumberObject],
-        "isPromise": [Function isPromise],
-        "isProxy": [Function isProxy],
-        "isRegExp": [Function isRegExp],
-        "isSet": [Function isSet],
-        "isSetIterator": [Function isSetIterator],
-        "isSharedArrayBuffer": [Function isSharedArrayBuffer],
-        "isStringObject": [Function isStringObject],
-        "isSymbolObject": [Function isSymbolObject],
-        "isTypedArray": [Function isTypedArray],
-        "isUint16Array": [Function isUint16Array],
-        "isUint32Array": [Function isUint32Array],
-        "isUint8Array": [Function isUint8Array],
-        "isUint8ClampedArray": [Function isUint8ClampedArray],
-        "isWeakMap": [Function isWeakMap],
-        "isWeakSet": [Function isWeakSet],
-      },
-    },
-  },
-  "atob": [Function atob],
-  "btoa": [Function btoa],
-  "clearImmediate": [Function clearImmediate],
-  "clearInterval": [Function clearInterval],
-  "clearTimeout": [Function clearTimeout],
-  "crypto": Crypto {},
-  "fetch": [Function fetch],
-  "global": [Circular],
-  "navigator": Navigator {},
-  "performance": Performance {
-    Symbol(kEvents): Map {},
-    Symbol(events.maxEventTargetListeners): 10,
-    Symbol(events.maxEventTargetListenersWarned): false,
-    Symbol(kHandlers): Map {},
-    Symbol(performance): true,
-  },
-  "queueMicrotask": [Function queueMicrotask],
-  "setImmediate": [Function setImmediate],
-  "setInterval": [Function setInterval],
-  "setTimeout": [Function setTimeout],
-  "structuredClone": [Function structuredClone],
-  Symbol(vitest:SAFE_TIMERS): Object {
-    "clearImmediate": [Function clearImmediate],
-    "clearInterval": [Function clearInterval],
-    "clearTimeout": [Function clearTimeout],
-    "nextTick": [Function nextTick],
-    "setImmediate": [Function setImmediate],
-    "setInterval": [Function setInterval],
-    "setTimeout": [Function setTimeout],
-  },
-}
 
- ❯ fixtures/babel-plugin-transform-class-properties-test-fixtures-assumption-setPublicClassFields-static-this-exec.test.js:8:15
+ ❯ fixtures/babel-plugin-transform-class-properties-test-fixtures-assumption-setPublicClassFields-static-this-exec.test.js:13:22
-      6|  A.getA = () => this;
+     11|  A = null;
-      7|  const { self, getA } = A;
+     12|  expect(oldA.self).toBe(oldA);
-      8|  expect(self).toBe(A);
+     13|  expect(oldA.getA()).toBe(oldA);
        |                      ^
-      9|  expect(getA()).toBe(A);
+     14| })
-     10|  const oldA = A;
 
 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[58/98]⎯
 
@@ -634,165 +489,20 @@ TypeError: e.has is not a function
 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[70/98]⎯
 
  FAIL  fixtures/babel-plugin-transform-class-properties-test-fixtures-private-loose-static-this-exec.test.js > exec
-AssertionError: expected { Object: [Function Object], …(133), …(6) } to be [Function A] // Object.is equality
+AssertionError: expected null to be [Function A] // Object.is equality
 
 - Expected: 
 [Function A]
 
 + Received: 
-Object {
+null
-  "__vitest_environment__": "node",
-  "__vitest_required__": Object {
-    "timers": Object {
-      "_unrefActive": [Function deprecated],
-      "active": [Function deprecated],
-      "clearImmediate": [Function clearImmediate],
-      "clearInterval": [Function clearInterval],
-      "clearTimeout": [Function clearTimeout],
-      "enroll": [Function deprecated],
-      "promises": Object {
-        "scheduler": Scheduler {
-          Symbol(kScheduler): true,
-        },
-        "setImmediate": [Function setImmediate],
-        "setInterval": [Function setInterval],
-        "setTimeout": [Function setTimeout],
-      },
-      "setImmediate": [Function setImmediate],
-      "setInterval": [Function setInterval],
-      "setTimeout": [Function setTimeout],
-      "unenroll": [Function deprecated],
-    },
-    "util": Object {
-      "MIMEParams": [Function MIMEParams],
-      "MIMEType": [Function MIMEType],
-      "TextDecoder": [Function TextDecoder],
-      "TextEncoder": [Function TextEncoder],
-      "_errnoException": [Function _errnoException],
-      "_exceptionWithHostPort": [Function _exceptionWithHostPort],
-      "_extend": [Function deprecated],
-      "aborted": [Function aborted],
-      "callbackify": [Function callbackify],
-      "debug": [Function debuglog],
-      "debuglog": [Function debuglog],
-      "deprecate": [Function deprecate],
-      "format": [Function format],
-      "formatWithOptions": [Function formatWithOptions],
-      "getCallSite": [Function getCallSite],
-      "getSystemErrorMap": [Function getSystemErrorMap],
-      "getSystemErrorName": [Function getSystemErrorName],
-      "inherits": [Function inherits],
-      "inspect": [Function inspect],
-      "isArray": [Function deprecated],
-      "isBoolean": [Function deprecated],
-      "isBuffer": [Function deprecated],
-      "isDate": [Function deprecated],
-      "isDeepStrictEqual": [Function isDeepStrictEqual],
-      "isError": [Function deprecated],
-      "isFunction": [Function deprecated],
-      "isNull": [Function deprecated],
-      "isNullOrUndefined": [Function deprecated],
-      "isNumber": [Function deprecated],
-      "isObject": [Function deprecated],
-      "isPrimitive": [Function deprecated],
-      "isRegExp": [Function deprecated],
-      "isString": [Function deprecated],
-      "isSymbol": [Function deprecated],
-      "isUndefined": [Function deprecated],
-      "log": [Function deprecated],
-      "parseArgs": [Function parseArgs],
-      "parseEnv": [Function parseEnv],
-      "promisify": [Function promisify],
-      "stripVTControlCharacters": [Function stripVTControlCharacters],
-      "styleText": [Function styleText],
-      "toUSVString": [Function toUSVString],
-      "transferableAbortController": [Function transferableAbortController],
-      "transferableAbortSignal": [Function transferableAbortSignal],
-      "types": Object {
-        "isAnyArrayBuffer": [Function isAnyArrayBuffer],
-        "isArgumentsObject": [Function isArgumentsObject],
-        "isArrayBuffer": [Function isArrayBuffer],
-        "isArrayBufferView": [Function isView],
-        "isAsyncFunction": [Function isAsyncFunction],
-        "isBigInt64Array": [Function isBigInt64Array],
-        "isBigIntObject": [Function isBigIntObject],
-        "isBigUint64Array": [Function isBigUint64Array],
-        "isBooleanObject": [Function isBooleanObject],
-        "isBoxedPrimitive": [Function isBoxedPrimitive],
-        "isCryptoKey": [Function value],
-        "isDataView": [Function isDataView],
-        "isDate": [Function isDate],
-        "isExternal": [Function isExternal],
-        "isFloat32Array": [Function isFloat32Array],
-        "isFloat64Array": [Function isFloat64Array],
-        "isGeneratorFunction": [Function isGeneratorFunction],
-        "isGeneratorObject": [Function isGeneratorObject],
-        "isInt16Array": [Function isInt16Array],
-        "isInt32Array": [Function isInt32Array],
-        "isInt8Array": [Function isInt8Array],
-        "isKeyObject": [Function value],
-        "isMap": [Function isMap],
-        "isMapIterator": [Function isMapIterator],
-        "isModuleNamespaceObject": [Function isModuleNamespaceObject],
-        "isNativeError": [Function isNativeError],
-        "isNumberObject": [Function isNumberObject],
-        "isPromise": [Function isPromise],
-        "isProxy": [Function isProxy],
-        "isRegExp": [Function isRegExp],
-        "isSet": [Function isSet],
-        "isSetIterator": [Function isSetIterator],
-        "isSharedArrayBuffer": [Function isSharedArrayBuffer],
-        "isStringObject": [Function isStringObject],
-        "isSymbolObject": [Function isSymbolObject],
-        "isTypedArray": [Function isTypedArray],
-        "isUint16Array": [Function isUint16Array],
-        "isUint32Array": [Function isUint32Array],
-        "isUint8Array": [Function isUint8Array],
-        "isUint8ClampedArray": [Function isUint8ClampedArray],
-        "isWeakMap": [Function isWeakMap],
-        "isWeakSet": [Function isWeakSet],
-      },
-    },
-  },
-  "atob": [Function atob],
-  "btoa": [Function btoa],
-  "clearImmediate": [Function clearImmediate],
-  "clearInterval": [Function clearInterval],
-  "clearTimeout": [Function clearTimeout],
-  "crypto": Crypto {},
-  "fetch": [Function fetch],
-  "global": [Circular],
-  "navigator": Navigator {},
-  "performance": Performance {
-    Symbol(kEvents): Map {},
-    Symbol(events.maxEventTargetListeners): 10,
-    Symbol(events.maxEventTargetListenersWarned): false,
-    Symbol(kHandlers): Map {},
-    Symbol(performance): true,
-  },
-  "queueMicrotask": [Function queueMicrotask],
-  "setImmediate": [Function setImmediate],
-  "setInterval": [Function setInterval],
-  "setTimeout": [Function setTimeout],
-  "structuredClone": [Function structuredClone],
-  Symbol(vitest:SAFE_TIMERS): Object {
-    "clearImmediate": [Function clearImmediate],
-    "clearInterval": [Function clearInterval],
-    "clearTimeout": [Function clearTimeout],
-    "nextTick": [Function nextTick],
-    "setImmediate": [Function setImmediate],
-    "setInterval": [Function setInterval],
-    "setTimeout": [Function setTimeout],
-  },
-}
 
- ❯ fixtures/babel-plugin-transform-class-properties-test-fixtures-private-loose-static-this-exec.test.js:15:15
+ ❯ fixtures/babel-plugin-transform-class-properties-test-fixtures-private-loose-static-this-exec.test.js:20:32
-     13|  var _getA = { _: () => this };
+     18|  A = null;
-     14|  const { self, getA } = A.extract();
+     19|  expect(oldA.extract().self).toBe(oldA);
-     15|  expect(self).toBe(A);
+     20|  expect(oldA.extract().getA()).toBe(oldA);
        |                                ^
-     16|  expect(getA()).toBe(A);
+     21| })
-     17|  const oldA = A;
 
 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[71/98]⎯
 
@@ -915,165 +625,20 @@ TypeError: e.has is not a function
 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[80/98]⎯
 
  FAIL  fixtures/babel-plugin-transform-class-properties-test-fixtures-private-static-this-exec.test.js > exec
-AssertionError: expected { Object: [Function Object], …(133), …(6) } to be [Function A] // Object.is equality
+AssertionError: expected null to be [Function A] // Object.is equality
 
 - Expected: 
 [Function A]
 
 + Received: 
-Object {
+null
-  "__vitest_environment__": "node",
-  "__vitest_required__": Object {
-    "timers": Object {
-      "_unrefActive": [Function deprecated],
-      "active": [Function deprecated],
-      "clearImmediate": [Function clearImmediate],
-      "clearInterval": [Function clearInterval],
-      "clearTimeout": [Function clearTimeout],
-      "enroll": [Function deprecated],
-      "promises": Object {
-        "scheduler": Scheduler {
-          Symbol(kScheduler): true,
-        },
-        "setImmediate": [Function setImmediate],
-        "setInterval": [Function setInterval],
-        "setTimeout": [Function setTimeout],
-      },
-      "setImmediate": [Function setImmediate],
-      "setInterval": [Function setInterval],
-      "setTimeout": [Function setTimeout],
-      "unenroll": [Function deprecated],
-    },
-    "util": Object {
-      "MIMEParams": [Function MIMEParams],
-      "MIMEType": [Function MIMEType],
-      "TextDecoder": [Function TextDecoder],
-      "TextEncoder": [Function TextEncoder],
-      "_errnoException": [Function _errnoException],
-      "_exceptionWithHostPort": [Function _exceptionWithHostPort],
-      "_extend": [Function deprecated],
-      "aborted": [Function aborted],
-      "callbackify": [Function callbackify],
-      "debug": [Function debuglog],
-      "debuglog": [Function debuglog],
-      "deprecate": [Function deprecate],
-      "format": [Function format],
-      "formatWithOptions": [Function formatWithOptions],
-      "getCallSite": [Function getCallSite],
-      "getSystemErrorMap": [Function getSystemErrorMap],
-      "getSystemErrorName": [Function getSystemErrorName],
-      "inherits": [Function inherits],
-      "inspect": [Function inspect],
-      "isArray": [Function deprecated],
-      "isBoolean": [Function deprecated],
-      "isBuffer": [Function deprecated],
-      "isDate": [Function deprecated],
-      "isDeepStrictEqual": [Function isDeepStrictEqual],
-      "isError": [Function deprecated],
-      "isFunction": [Function deprecated],
-      "isNull": [Function deprecated],
-      "isNullOrUndefined": [Function deprecated],
-      "isNumber": [Function deprecated],
-      "isObject": [Function deprecated],
-      "isPrimitive": [Function deprecated],
-      "isRegExp": [Function deprecated],
-      "isString": [Function deprecated],
-      "isSymbol": [Function deprecated],
-      "isUndefined": [Function deprecated],
-      "log": [Function deprecated],
-      "parseArgs": [Function parseArgs],
-      "parseEnv": [Function parseEnv],
-      "promisify": [Function promisify],
-      "stripVTControlCharacters": [Function stripVTControlCharacters],
-      "styleText": [Function styleText],
-      "toUSVString": [Function toUSVString],
-      "transferableAbortController": [Function transferableAbortController],
-      "transferableAbortSignal": [Function transferableAbortSignal],
-      "types": Object {
-        "isAnyArrayBuffer": [Function isAnyArrayBuffer],
-        "isArgumentsObject": [Function isArgumentsObject],
-        "isArrayBuffer": [Function isArrayBuffer],
-        "isArrayBufferView": [Function isView],
-        "isAsyncFunction": [Function isAsyncFunction],
-        "isBigInt64Array": [Function isBigInt64Array],
-        "isBigIntObject": [Function isBigIntObject],
-        "isBigUint64Array": [Function isBigUint64Array],
-        "isBooleanObject": [Function isBooleanObject],
-        "isBoxedPrimitive": [Function isBoxedPrimitive],
-        "isCryptoKey": [Function value],
-        "isDataView": [Function isDataView],
-        "isDate": [Function isDate],
-        "isExternal": [Function isExternal],
-        "isFloat32Array": [Function isFloat32Array],
-        "isFloat64Array": [Function isFloat64Array],
-        "isGeneratorFunction": [Function isGeneratorFunction],
-        "isGeneratorObject": [Function isGeneratorObject],
-        "isInt16Array": [Function isInt16Array],
-        "isInt32Array": [Function isInt32Array],
-        "isInt8Array": [Function isInt8Array],
-        "isKeyObject": [Function value],
-        "isMap": [Function isMap],
-        "isMapIterator": [Function isMapIterator],
-        "isModuleNamespaceObject": [Function isModuleNamespaceObject],
-        "isNativeError": [Function isNativeError],
-        "isNumberObject": [Function isNumberObject],
-        "isPromise": [Function isPromise],
-        "isProxy": [Function isProxy],
-        "isRegExp": [Function isRegExp],
-        "isSet": [Function isSet],
-        "isSetIterator": [Function isSetIterator],
-        "isSharedArrayBuffer": [Function isSharedArrayBuffer],
-        "isStringObject": [Function isStringObject],
-        "isSymbolObject": [Function isSymbolObject],
-        "isTypedArray": [Function isTypedArray],
-        "isUint16Array": [Function isUint16Array],
-        "isUint32Array": [Function isUint32Array],
-        "isUint8Array": [Function isUint8Array],
-        "isUint8ClampedArray": [Function isUint8ClampedArray],
-        "isWeakMap": [Function isWeakMap],
-        "isWeakSet": [Function isWeakSet],
-      },
-    },
-  },
-  "atob": [Function atob],
-  "btoa": [Function btoa],
-  "clearImmediate": [Function clearImmediate],
-  "clearInterval": [Function clearInterval],
-  "clearTimeout": [Function clearTimeout],
-  "crypto": Crypto {},
-  "fetch": [Function fetch],
-  "global": [Circular],
-  "navigator": Navigator {},
-  "performance": Performance {
-    Symbol(kEvents): Map {},
-    Symbol(events.maxEventTargetListeners): 10,
-    Symbol(events.maxEventTargetListenersWarned): false,
-    Symbol(kHandlers): Map {},
-    Symbol(performance): true,
-  },
-  "queueMicrotask": [Function queueMicrotask],
-  "setImmediate": [Function setImmediate],
-  "setInterval": [Function setInterval],
-  "setTimeout": [Function setTimeout],
-  "structuredClone": [Function structuredClone],
-  Symbol(vitest:SAFE_TIMERS): Object {
-    "clearImmediate": [Function clearImmediate],
-    "clearInterval": [Function clearInterval],
-    "clearTimeout": [Function clearTimeout],
-    "nextTick": [Function nextTick],
-    "setImmediate": [Function setImmediate],
-    "setInterval": [Function setInterval],
-    "setTimeout": [Function setTimeout],
-  },
-}
 
- ❯ fixtures/babel-plugin-transform-class-properties-test-fixtures-private-static-this-exec.test.js:15:15
+ ❯ fixtures/babel-plugin-transform-class-properties-test-fixtures-private-static-this-exec.test.js:20:32
-     13|  var _getA = { _: () => this };
+     18|  A = null;
-     14|  const { self, getA } = A.extract();
+     19|  expect(oldA.extract().self).toBe(oldA);
-     15|  expect(self).toBe(A);
+     20|  expect(oldA.extract().getA()).toBe(oldA);
        |                                ^
-     16|  expect(getA()).toBe(A);
+     21| })
-     17|  const oldA = A;
 
 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[81/98]⎯
 
@@ -1147,165 +712,20 @@ Received: "_Class"
 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[85/98]⎯
 
  FAIL  fixtures/babel-plugin-transform-class-properties-test-fixtures-public-loose-static-this-exec.test.js > exec
-AssertionError: expected { Object: [Function Object], …(133), …(6) } to be [Function A] // Object.is equality
+AssertionError: expected null to be [Function A] // Object.is equality
 
 - Expected: 
 [Function A]
 
 + Received: 
-Object {
+null
-  "__vitest_environment__": "node",
-  "__vitest_required__": Object {
-    "timers": Object {
-      "_unrefActive": [Function deprecated],
-      "active": [Function deprecated],
-      "clearImmediate": [Function clearImmediate],
-      "clearInterval": [Function clearInterval],
-      "clearTimeout": [Function clearTimeout],
-      "enroll": [Function deprecated],
-      "promises": Object {
-        "scheduler": Scheduler {
-          Symbol(kScheduler): true,
-        },
-        "setImmediate": [Function setImmediate],
-        "setInterval": [Function setInterval],
-        "setTimeout": [Function setTimeout],
-      },
-      "setImmediate": [Function setImmediate],
-      "setInterval": [Function setInterval],
-      "setTimeout": [Function setTimeout],
-      "unenroll": [Function deprecated],
-    },
-    "util": Object {
-      "MIMEParams": [Function MIMEParams],
-      "MIMEType": [Function MIMEType],
-      "TextDecoder": [Function TextDecoder],
-      "TextEncoder": [Function TextEncoder],
-      "_errnoException": [Function _errnoException],
-      "_exceptionWithHostPort": [Function _exceptionWithHostPort],
-      "_extend": [Function deprecated],
-      "aborted": [Function aborted],
-      "callbackify": [Function callbackify],
-      "debug": [Function debuglog],
-      "debuglog": [Function debuglog],
-      "deprecate": [Function deprecate],
-      "format": [Function format],
-      "formatWithOptions": [Function formatWithOptions],
-      "getCallSite": [Function getCallSite],
-      "getSystemErrorMap": [Function getSystemErrorMap],
-      "getSystemErrorName": [Function getSystemErrorName],
-      "inherits": [Function inherits],
-      "inspect": [Function inspect],
-      "isArray": [Function deprecated],
-      "isBoolean": [Function deprecated],
-      "isBuffer": [Function deprecated],
-      "isDate": [Function deprecated],
-      "isDeepStrictEqual": [Function isDeepStrictEqual],
-      "isError": [Function deprecated],
-      "isFunction": [Function deprecated],
-      "isNull": [Function deprecated],
-      "isNullOrUndefined": [Function deprecated],
-      "isNumber": [Function deprecated],
-      "isObject": [Function deprecated],
-      "isPrimitive": [Function deprecated],
-      "isRegExp": [Function deprecated],
-      "isString": [Function deprecated],
-      "isSymbol": [Function deprecated],
-      "isUndefined": [Function deprecated],
-      "log": [Function deprecated],
-      "parseArgs": [Function parseArgs],
-      "parseEnv": [Function parseEnv],
-      "promisify": [Function promisify],
-      "stripVTControlCharacters": [Function stripVTControlCharacters],
-      "styleText": [Function styleText],
-      "toUSVString": [Function toUSVString],
-      "transferableAbortController": [Function transferableAbortController],
-      "transferableAbortSignal": [Function transferableAbortSignal],
-      "types": Object {
-        "isAnyArrayBuffer": [Function isAnyArrayBuffer],
-        "isArgumentsObject": [Function isArgumentsObject],
-        "isArrayBuffer": [Function isArrayBuffer],
-        "isArrayBufferView": [Function isView],
-        "isAsyncFunction": [Function isAsyncFunction],
-        "isBigInt64Array": [Function isBigInt64Array],
-        "isBigIntObject": [Function isBigIntObject],
-        "isBigUint64Array": [Function isBigUint64Array],
-        "isBooleanObject": [Function isBooleanObject],
-        "isBoxedPrimitive": [Function isBoxedPrimitive],
-        "isCryptoKey": [Function value],
-        "isDataView": [Function isDataView],
-        "isDate": [Function isDate],
-        "isExternal": [Function isExternal],
-        "isFloat32Array": [Function isFloat32Array],
-        "isFloat64Array": [Function isFloat64Array],
-        "isGeneratorFunction": [Function isGeneratorFunction],
-        "isGeneratorObject": [Function isGeneratorObject],
-        "isInt16Array": [Function isInt16Array],
-        "isInt32Array": [Function isInt32Array],
-        "isInt8Array": [Function isInt8Array],
-        "isKeyObject": [Function value],
-        "isMap": [Function isMap],
-        "isMapIterator": [Function isMapIterator],
-        "isModuleNamespaceObject": [Function isModuleNamespaceObject],
-        "isNativeError": [Function isNativeError],
-        "isNumberObject": [Function isNumberObject],
-        "isPromise": [Function isPromise],
-        "isProxy": [Function isProxy],
-        "isRegExp": [Function isRegExp],
-        "isSet": [Function isSet],
-        "isSetIterator": [Function isSetIterator],
-        "isSharedArrayBuffer": [Function isSharedArrayBuffer],
-        "isStringObject": [Function isStringObject],
-        "isSymbolObject": [Function isSymbolObject],
-        "isTypedArray": [Function isTypedArray],
-        "isUint16Array": [Function isUint16Array],
-        "isUint32Array": [Function isUint32Array],
-        "isUint8Array": [Function isUint8Array],
-        "isUint8ClampedArray": [Function isUint8ClampedArray],
-        "isWeakMap": [Function isWeakMap],
-        "isWeakSet": [Function isWeakSet],
-      },
-    },
-  },
-  "atob": [Function atob],
-  "btoa": [Function btoa],
-  "clearImmediate": [Function clearImmediate],
-  "clearInterval": [Function clearInterval],
-  "clearTimeout": [Function clearTimeout],
-  "crypto": Crypto {},
-  "fetch": [Function fetch],
-  "global": [Circular],
-  "navigator": Navigator {},
-  "performance": Performance {
-    Symbol(kEvents): Map {},
-    Symbol(events.maxEventTargetListeners): 10,
-    Symbol(events.maxEventTargetListenersWarned): false,
-    Symbol(kHandlers): Map {},
-    Symbol(performance): true,
-  },
-  "queueMicrotask": [Function queueMicrotask],
-  "setImmediate": [Function setImmediate],
-  "setInterval": [Function setInterval],
-  "setTimeout": [Function setTimeout],
-  "structuredClone": [Function structuredClone],
-  Symbol(vitest:SAFE_TIMERS): Object {
-    "clearImmediate": [Function clearImmediate],
-    "clearInterval": [Function clearInterval],
-    "clearTimeout": [Function clearTimeout],
-    "nextTick": [Function nextTick],
-    "setImmediate": [Function setImmediate],
-    "setInterval": [Function setInterval],
-    "setTimeout": [Function setTimeout],
-  },
-}
 
- ❯ fixtures/babel-plugin-transform-class-properties-test-fixtures-public-loose-static-this-exec.test.js:8:15
+ ❯ fixtures/babel-plugin-transform-class-properties-test-fixtures-public-loose-static-this-exec.test.js:13:22
-      6|  A.getA = () => this;
+     11|  A = null;
-      7|  const { self, getA } = A;
+     12|  expect(oldA.self).toBe(oldA);
-      8|  expect(self).toBe(A);
+     13|  expect(oldA.getA()).toBe(oldA);
        |                      ^
-      9|  expect(getA()).toBe(A);
+     14| })
-     10|  const oldA = A;
 
 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[86/98]⎯
 
@@ -1343,165 +763,20 @@ Received: "_Class"
 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[88/98]⎯
 
  FAIL  fixtures/babel-plugin-transform-class-properties-test-fixtures-public-static-this-exec.test.js > exec
-AssertionError: expected { Object: [Function Object], …(133), …(6) } to be [Function A] // Object.is equality
+AssertionError: expected null to be [Function A] // Object.is equality
 
 - Expected: 
 [Function A]
 
 + Received: 
-Object {
+null
-  "__vitest_environment__": "node",
-  "__vitest_required__": Object {
-    "timers": Object {
-      "_unrefActive": [Function deprecated],
-      "active": [Function deprecated],
-      "clearImmediate": [Function clearImmediate],
-      "clearInterval": [Function clearInterval],
-      "clearTimeout": [Function clearTimeout],
-      "enroll": [Function deprecated],
-      "promises": Object {
-        "scheduler": Scheduler {
-          Symbol(kScheduler): true,
-        },
-        "setImmediate": [Function setImmediate],
-        "setInterval": [Function setInterval],
-        "setTimeout": [Function setTimeout],
-      },
-      "setImmediate": [Function setImmediate],
-      "setInterval": [Function setInterval],
-      "setTimeout": [Function setTimeout],
-      "unenroll": [Function deprecated],
-    },
-    "util": Object {
-      "MIMEParams": [Function MIMEParams],
-      "MIMEType": [Function MIMEType],
-      "TextDecoder": [Function TextDecoder],
-      "TextEncoder": [Function TextEncoder],
-      "_errnoException": [Function _errnoException],
-      "_exceptionWithHostPort": [Function _exceptionWithHostPort],
-      "_extend": [Function deprecated],
-      "aborted": [Function aborted],
-      "callbackify": [Function callbackify],
-      "debug": [Function debuglog],
-      "debuglog": [Function debuglog],
-      "deprecate": [Function deprecate],
-      "format": [Function format],
-      "formatWithOptions": [Function formatWithOptions],
-      "getCallSite": [Function getCallSite],
-      "getSystemErrorMap": [Function getSystemErrorMap],
-      "getSystemErrorName": [Function getSystemErrorName],
-      "inherits": [Function inherits],
-      "inspect": [Function inspect],
-      "isArray": [Function deprecated],
-      "isBoolean": [Function deprecated],
-      "isBuffer": [Function deprecated],
-      "isDate": [Function deprecated],
-      "isDeepStrictEqual": [Function isDeepStrictEqual],
-      "isError": [Function deprecated],
-      "isFunction": [Function deprecated],
-      "isNull": [Function deprecated],
-      "isNullOrUndefined": [Function deprecated],
-      "isNumber": [Function deprecated],
-      "isObject": [Function deprecated],
-      "isPrimitive": [Function deprecated],
-      "isRegExp": [Function deprecated],
-      "isString": [Function deprecated],
-      "isSymbol": [Function deprecated],
-      "isUndefined": [Function deprecated],
-      "log": [Function deprecated],
-      "parseArgs": [Function parseArgs],
-      "parseEnv": [Function parseEnv],
-      "promisify": [Function promisify],
-      "stripVTControlCharacters": [Function stripVTControlCharacters],
-      "styleText": [Function styleText],
-      "toUSVString": [Function toUSVString],
-      "transferableAbortController": [Function transferableAbortController],
-      "transferableAbortSignal": [Function transferableAbortSignal],
-      "types": Object {
-        "isAnyArrayBuffer": [Function isAnyArrayBuffer],
-        "isArgumentsObject": [Function isArgumentsObject],
-        "isArrayBuffer": [Function isArrayBuffer],
-        "isArrayBufferView": [Function isView],
-        "isAsyncFunction": [Function isAsyncFunction],
-        "isBigInt64Array": [Function isBigInt64Array],
-        "isBigIntObject": [Function isBigIntObject],
-        "isBigUint64Array": [Function isBigUint64Array],
-        "isBooleanObject": [Function isBooleanObject],
-        "isBoxedPrimitive": [Function isBoxedPrimitive],
-        "isCryptoKey": [Function value],
-        "isDataView": [Function isDataView],
-        "isDate": [Function isDate],
-        "isExternal": [Function isExternal],
-        "isFloat32Array": [Function isFloat32Array],
-        "isFloat64Array": [Function isFloat64Array],
-        "isGeneratorFunction": [Function isGeneratorFunction],
-        "isGeneratorObject": [Function isGeneratorObject],
-        "isInt16Array": [Function isInt16Array],
-        "isInt32Array": [Function isInt32Array],
-        "isInt8Array": [Function isInt8Array],
-        "isKeyObject": [Function value],
-        "isMap": [Function isMap],
-        "isMapIterator": [Function isMapIterator],
-        "isModuleNamespaceObject": [Function isModuleNamespaceObject],
-        "isNativeError": [Function isNativeError],
-        "isNumberObject": [Function isNumberObject],
-        "isPromise": [Function isPromise],
-        "isProxy": [Function isProxy],
-        "isRegExp": [Function isRegExp],
-        "isSet": [Function isSet],
-        "isSetIterator": [Function isSetIterator],
-        "isSharedArrayBuffer": [Function isSharedArrayBuffer],
-        "isStringObject": [Function isStringObject],
-        "isSymbolObject": [Function isSymbolObject],
-        "isTypedArray": [Function isTypedArray],
-        "isUint16Array": [Function isUint16Array],
-        "isUint32Array": [Function isUint32Array],
-        "isUint8Array": [Function isUint8Array],
-        "isUint8ClampedArray": [Function isUint8ClampedArray],
-        "isWeakMap": [Function isWeakMap],
-        "isWeakSet": [Function isWeakSet],
-      },
-    },
-  },
-  "atob": [Function atob],
-  "btoa": [Function btoa],
-  "clearImmediate": [Function clearImmediate],
-  "clearInterval": [Function clearInterval],
-  "clearTimeout": [Function clearTimeout],
-  "crypto": Crypto {},
-  "fetch": [Function fetch],
-  "global": [Circular],
-  "navigator": Navigator {},
-  "performance": Performance {
-    Symbol(kEvents): Map {},
-    Symbol(events.maxEventTargetListeners): 10,
-    Symbol(events.maxEventTargetListenersWarned): false,
-    Symbol(kHandlers): Map {},
-    Symbol(performance): true,
-  },
-  "queueMicrotask": [Function queueMicrotask],
-  "setImmediate": [Function setImmediate],
-  "setInterval": [Function setInterval],
-  "setTimeout": [Function setTimeout],
-  "structuredClone": [Function structuredClone],
-  Symbol(vitest:SAFE_TIMERS): Object {
-    "clearImmediate": [Function clearImmediate],
-    "clearInterval": [Function clearInterval],
-    "clearTimeout": [Function clearTimeout],
-    "nextTick": [Function nextTick],
-    "setImmediate": [Function setImmediate],
-    "setInterval": [Function setInterval],
-    "setTimeout": [Function setTimeout],
-  },
-}
 
- ❯ fixtures/babel-plugin-transform-class-properties-test-fixtures-public-static-this-exec.test.js:9:15
+ ❯ fixtures/babel-plugin-transform-class-properties-test-fixtures-public-static-this-exec.test.js:14:22
-      7|  _defineProperty(A, "getA", () => this);
+     12|  A = null;
-      8|  const { self, getA } = A;
+     13|  expect(oldA.self).toBe(oldA);
-      9|  expect(self).toBe(A);
+     14|  expect(oldA.getA()).toBe(oldA);
        |                      ^
-     10|  expect(getA()).toBe(A);
+     15| })
-     11|  const oldA = A;
 
 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[89/98]⎯