feat(transformer): add decorators plugin (#2139)

crates/oxc_ast/src/ast/js.rs

@@ -1443,6 +1443,12 @@ pub struct BindingPattern<'a> {
     pub optional: bool,
 }
 
+impl<'a> BindingPattern<'a> {
+    pub fn new_with_kind(kind: BindingPatternKind<'a>) -> Self {
+        Self { kind, type_annotation: None, optional: false }
+    }
+}
+
 #[derive(Debug, Hash)]
 #[cfg_attr(feature = "serde", derive(Serialize), serde(untagged))]
 pub enum BindingPatternKind<'a> {

crates/oxc_transformer/src/lib.rs

@@ -16,6 +16,7 @@ mod es2021;
 mod es2022;
 mod es3;
 mod options;
+mod proposals;
 mod react_jsx;
 mod regexp;
 #[cfg(test)]
@@ -31,6 +32,7 @@ use oxc_ast::{ast::*, AstBuilder, AstKind, VisitMut};
 use oxc_diagnostics::Error;
 use oxc_semantic::{ScopeFlags, Semantic};
 use oxc_span::SourceType;
+use proposals::Decorators;
 
 use crate::{
     context::TransformerCtx, es2015::*, es2016::ExponentiationOperator,
@@ -43,12 +45,14 @@ pub use crate::{
     es2015::ArrowFunctionsOptions,
     es2020::NullishCoalescingOperatorOptions,
     options::{TransformOptions, TransformTarget},
+    proposals::DecoratorsOptions,
     react_jsx::{ReactJsxOptions, ReactJsxRuntime, ReactJsxRuntimeOption},
     typescript::TypescriptOptions,
 };
 
 pub struct Transformer<'a> {
     ctx: TransformerCtx<'a>,
+    decorators: Option<Decorators<'a>>,
     #[allow(unused)]
     typescript: Option<TypeScript<'a>>,
     react_jsx: Option<ReactJsx<'a>>,
@@ -90,6 +94,7 @@ impl<'a> Transformer<'a> {
 
         Self {
             ctx: ctx.clone(),
+            decorators: Decorators::new(Rc::clone(&ast), ctx.clone(), &options),
             // TODO: pass verbatim_module_syntax from user config
             typescript: source_type.is_typescript().then(|| TypeScript::new(Rc::clone(&ast), ctx.clone(), false, &options)),
             regexp_flags: RegexpFlags::new(Rc::clone(&ast), &options),
@@ -164,7 +169,7 @@ impl<'a> VisitMut<'a> for Transformer<'a> {
         self.visit_statements(&mut program.body);
 
         self.react_jsx.as_mut().map(|t| t.add_react_jsx_runtime_imports(program));
-
+        self.decorators.as_mut().map(|t| t.transform_program(program));
         self.leave_node(kind);
         self.leave_scope();
     }
@@ -202,6 +207,7 @@ impl<'a> VisitMut<'a> for Transformer<'a> {
     fn visit_declaration(&mut self, decl: &mut Declaration<'a>) {
         self.visit_declaration_match(decl);
         self.typescript.as_mut().map(|t| t.transform_declaration(decl));
+        self.decorators.as_mut().map(|t| t.transform_declaration(decl));
     }
 
     fn visit_expression(&mut self, expr: &mut Expression<'a>) {

crates/oxc_transformer/src/options.rs

@@ -2,7 +2,7 @@ use oxc_syntax::assumptions::CompilerAssumptions;
 
 use crate::{
     es2015::ArrowFunctionsOptions, es2020::NullishCoalescingOperatorOptions,
-    react_jsx::ReactJsxOptions, typescript::TypescriptOptions,
+    proposals::DecoratorsOptions, react_jsx::ReactJsxOptions, typescript::TypescriptOptions,
 };
 
 #[derive(Debug, Default, Clone)]
@@ -35,6 +35,8 @@ pub struct TransformOptions {
     pub babel_8_breaking: Option<bool>,
     pub instanceof: bool,
     pub new_target: bool,
+    // Proposal
+    pub decorators: Option<DecoratorsOptions>,
 }
 
 /// See <https://www.typescriptlang.org/tsconfig#target>

crates/oxc_transformer/src/proposals/decorators.rs

@@ -0,0 +1,149 @@
+use std::rc::Rc;
+
+use oxc_allocator::Box;
+use oxc_ast::{ast::*, AstBuilder};
+use oxc_span::{Atom, SPAN};
+use oxc_syntax::operator::{AssignmentOperator, LogicalOperator};
+use serde::Deserialize;
+
+use crate::{context::TransformerCtx, options::TransformOptions};
+
+/// Proposal: Decorators
+///
+/// References:
+/// * <https://babel.dev/docs/babel-plugin-proposal-decorators>
+/// * <https://github.com/babel/babel/blob/main/packages/babel-plugin-proposal-decorators>
+/// * <https://github.com/tc39/proposal-decorators>
+pub struct Decorators<'a> {
+    ast: Rc<AstBuilder<'a>>,
+    _ctx: TransformerCtx<'a>,
+    options: DecoratorsOptions,
+    // Insert to the top of the program
+    top_statements: Vec<Statement<'a>>,
+}
+
+#[derive(Debug, Clone, Copy, Default, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct DecoratorsOptions {
+    version: Version,
+}
+
+#[derive(Debug, Default, Clone, Copy, Deserialize)]
+#[serde(rename_all = "camelCase")]
+enum Version {
+    Legacy,
+    #[serde(rename = "2023-05")]
+    #[default]
+    Year2023May,
+}
+impl Version {
+    fn is_legacy(self) -> bool {
+        matches!(self, Self::Legacy)
+    }
+}
+
+impl<'a> Decorators<'a> {
+    pub fn new(
+        ast: Rc<AstBuilder<'a>>,
+        ctx: TransformerCtx<'a>,
+        options: &TransformOptions,
+    ) -> Option<Self> {
+        options.decorators.map(|options| Self {
+            ast,
+            _ctx: ctx,
+            options,
+            top_statements: Vec::new(),
+        })
+    }
+
+    pub fn transform_program(&mut self, program: &mut Program<'a>) {
+        program.body.splice(0..0, self.top_statements.drain(..));
+    }
+
+    pub fn transform_declaration(&mut self, decl: &mut Declaration<'a>) {
+        let new_decl = match decl {
+            Declaration::ClassDeclaration(class) => {
+                if self.options.version.is_legacy() {
+                    Some(self.transform_class_legacy(class))
+                } else {
+                    None
+                }
+            }
+            _ => None,
+        };
+        if let Some(new_decl) = new_decl {
+            *decl = new_decl;
+        }
+    }
+
+    pub fn transform_class_legacy(
+        &mut self,
+        class: &mut Box<'a, oxc_ast::ast::Class<'a>>,
+    ) -> Declaration<'a> {
+        let class_identifier_name: Atom = "_class".into();
+        let class_identifier = IdentifierReference::new(SPAN, class_identifier_name.clone());
+
+        let decl = self.ast.variable_declaration(
+            SPAN,
+            VariableDeclarationKind::Var,
+            self.ast.new_vec_single(self.ast.variable_declarator(
+                SPAN,
+                VariableDeclarationKind::Var,
+                BindingPattern::new_with_kind(self.ast.binding_pattern_identifier(
+                    BindingIdentifier::new(SPAN, class_identifier_name),
+                )),
+                None,
+                false,
+            )),
+            Modifiers::empty(),
+        );
+        self.top_statements.push(Statement::Declaration(Declaration::VariableDeclaration(decl)));
+
+        let left = AssignmentTarget::SimpleAssignmentTarget(
+            self.ast.simple_assignment_target_identifier(class_identifier.clone()),
+        );
+        let right = self.ast.class_expression(self.ast.copy(class));
+        let new_expr =
+            self.ast.assignment_expression(SPAN, AssignmentOperator::Assign, left, right);
+
+        let new_expr = class.decorators.drain(..).fold(new_expr, |new_expr, decorator| {
+            match &decorator.expression {
+                Expression::Identifier(identifier) => self.ast.call_expression(
+                    SPAN,
+                    self.ast.identifier_reference_expression(IdentifierReference::new(
+                        SPAN,
+                        identifier.name.clone(),
+                    )),
+                    self.ast.new_vec_single(Argument::Expression(self.ast.copy(&new_expr))),
+                    false,
+                    None,
+                ),
+                _ => new_expr,
+            }
+        });
+
+        let init = self.ast.logical_expression(
+            SPAN,
+            new_expr,
+            LogicalOperator::Or,
+            self.ast.identifier_reference_expression(class_identifier),
+        );
+
+        let declarator = self.ast.variable_declarator(
+            SPAN,
+            VariableDeclarationKind::Let,
+            BindingPattern::new_with_kind(
+                self.ast.binding_pattern_identifier(self.ast.copy(&class.id.clone().unwrap())),
+            ),
+            Some(init),
+            false,
+        );
+
+        Declaration::VariableDeclaration(self.ast.variable_declaration(
+            SPAN,
+            VariableDeclarationKind::Let,
+            self.ast.new_vec_single(declarator),
+            Modifiers::empty(),
+        ))
+    }
+}

crates/oxc_transformer/src/proposals/mod.rs

@@ -0,0 +1,3 @@
+mod decorators;
+
+pub use decorators::{Decorators, DecoratorsOptions};

tasks/transform_conformance/babel.snap.md

@@ -1,4 +1,4 @@
-Passed: 323/1179
+Passed: 325/1369
 
 # All Passed:
 * babel-plugin-transform-numeric-separator
@@ -832,8 +832,7 @@ Passed: 323/1179
 * general/function-duplicate-name/input.js
 * general/object/input.js
 
-# babel-plugin-transform-typescript (92/158)
+# babel-plugin-transform-typescript (93/158)
-* class/abstract-class-decorated/input.ts
 * class/abstract-class-decorated-method/input.ts
 * class/abstract-class-decorated-parameter/input.ts
 * class/accessor-allowDeclareFields-false/input.ts
@@ -912,3 +911,194 @@ Passed: 323/1179
 * spread-transform/transform-to-babel-extend/input.js
 * spread-transform/transform-to-object-assign/input.js
 
+# babel-plugin-proposal-decorators (1/190)
+* 2018-09-transformation/async-generator-method/input.js
+* 2018-09-transformation/class-decorators-yield-await/input.js
+* 2021-12-accessors/context-name/input.js
+* 2021-12-accessors--to-es2015/context-name/input.js
+* 2021-12-fields/context-name/input.js
+* 2021-12-fields--to-es2015/context-name/input.js
+* 2021-12-getters/context-name/input.js
+* 2021-12-getters--to-es2015/context-name/input.js
+* 2021-12-methods/context-name/input.js
+* 2021-12-methods--to-es2015/context-name/input.js
+* 2021-12-misc/initProto-existing-derived-constructor/input.js
+* 2021-12-misc/setting-private-method/input.js
+* 2021-12-misc/setting-private-method-via-array-pattern/input.js
+* 2021-12-misc/setting-private-method-via-for-of/input.js
+* 2021-12-misc/setting-private-method-via-object-pattern/input.js
+* 2021-12-misc/setting-private-method-via-rest/input.js
+* 2021-12-misc/setting-private-method-via-update/input.js
+* 2021-12-setters/context-name/input.js
+* 2021-12-setters--to-es2015/context-name/input.js
+* 2022-03-accessors/context-name/input.js
+* 2022-03-accessors--to-es2015/context-name/input.js
+* 2022-03-classes/decorator-access-modified-fields/input.js
+* 2022-03-classes/decorator-access-modified-methods/input.js
+* 2022-03-fields/context-name/input.js
+* 2022-03-fields--to-es2015/context-name/input.js
+* 2022-03-getters/context-name/input.js
+* 2022-03-getters--to-es2015/context-name/input.js
+* 2022-03-methods/context-name/input.js
+* 2022-03-methods--to-es2015/context-name/input.js
+* 2022-03-misc/initProto-existing-derived-constructor/input.js
+* 2022-03-misc/setting-private-method/input.js
+* 2022-03-misc/setting-private-method-via-array-pattern/input.js
+* 2022-03-misc/setting-private-method-via-for-of/input.js
+* 2022-03-misc/setting-private-method-via-object-pattern/input.js
+* 2022-03-misc/setting-private-method-via-rest/input.js
+* 2022-03-misc/setting-private-method-via-update/input.js
+* 2022-03-setters/context-name/input.js
+* 2022-03-setters--to-es2015/context-name/input.js
+* 2023-01-accessors/context-name/input.js
+* 2023-01-accessors--to-es2015/context-name/input.js
+* 2023-01-classes/decorator-access-modified-fields/input.js
+* 2023-01-classes/decorator-access-modified-methods/input.js
+* 2023-01-fields/context-name/input.js
+* 2023-01-fields--to-es2015/context-name/input.js
+* 2023-01-getters/context-name/input.js
+* 2023-01-getters--to-es2015/context-name/input.js
+* 2023-01-methods/context-name/input.js
+* 2023-01-methods--to-es2015/context-name/input.js
+* 2023-01-misc/initProto-existing-derived-constructor/input.js
+* 2023-01-misc/setting-private-method/input.js
+* 2023-01-misc/setting-private-method-via-array-pattern/input.js
+* 2023-01-misc/setting-private-method-via-for-of/input.js
+* 2023-01-misc/setting-private-method-via-object-pattern/input.js
+* 2023-01-misc/setting-private-method-via-rest/input.js
+* 2023-01-misc/setting-private-method-via-update/input.js
+* 2023-01-setters/context-name/input.js
+* 2023-01-setters--to-es2015/context-name/input.js
+* 2023-05-accessors/context-name/input.js
+* 2023-05-accessors/private/input.js
+* 2023-05-accessors/public/input.js
+* 2023-05-accessors/static-private/input.js
+* 2023-05-accessors/static-public/input.js
+* 2023-05-accessors/undecorated-private/input.js
+* 2023-05-accessors/undecorated-public/input.js
+* 2023-05-accessors/undecorated-static-private/input.js
+* 2023-05-accessors/undecorated-static-public/input.js
+* 2023-05-accessors--to-es2015/context-name/input.js
+* 2023-05-accessors--to-es2015/private/input.js
+* 2023-05-accessors--to-es2015/public/input.js
+* 2023-05-accessors--to-es2015/static-private/input.js
+* 2023-05-accessors--to-es2015/static-public/input.js
+* 2023-05-accessors--to-es2015/undecorated-private/input.js
+* 2023-05-accessors--to-es2015/undecorated-public/input.js
+* 2023-05-accessors--to-es2015/undecorated-static-private/input.js
+* 2023-05-accessors--to-es2015/undecorated-static-public/input.js
+* 2023-05-assumption-constantSuper/super-in-nested-constructor-expression/input.js
+* 2023-05-assumption-constantSuper/super-in-private-accessor/input.js
+* 2023-05-assumption-constantSuper/super-in-private-method/input.js
+* 2023-05-classes/decorator-access-modified-fields/input.js
+* 2023-05-classes/decorator-access-modified-methods/input.js
+* 2023-05-classes/expressions/input.js
+* 2023-05-classes/expressions-static-blocks/input.js
+* 2023-05-classes/inheritance/input.js
+* 2023-05-classes/initializers/input.js
+* 2023-05-classes/replacement/input.js
+* 2023-05-classes/replacement-static-installed-on-correct-class/input.js
+* 2023-05-classes/replacement-static-this/input.js
+* 2023-05-classes/replacement-with-expr/input.js
+* 2023-05-classes--to-es2015/decorator-access-modified-fields/input.js
+* 2023-05-classes--to-es2015/decorator-access-modified-methods/input.js
+* 2023-05-classes--to-es2015/expressions/input.js
+* 2023-05-classes--to-es2015/expressions-static-blocks/input.js
+* 2023-05-classes--to-es2015/inheritance/input.js
+* 2023-05-classes--to-es2015/initializers/input.js
+* 2023-05-classes--to-es2015/replacement/input.js
+* 2023-05-classes--to-es2015/replacement-static-installed-on-correct-class/input.js
+* 2023-05-classes--to-es2015/replacement-static-this/input.js
+* 2023-05-classes--to-es2015/replacement-with-expr/input.js
+* 2023-05-duplicated-keys/computed-keys-same-ast/input.js
+* 2023-05-duplicated-keys/computed-keys-same-value/input.js
+* 2023-05-duplicated-keys/method-and-field/input.js
+* 2023-05-duplicated-keys/methods-with-same-key/input.js
+* 2023-05-duplicated-keys--to-es2015/computed-keys-same-ast/input.js
+* 2023-05-duplicated-keys--to-es2015/computed-keys-same-value/input.js
+* 2023-05-duplicated-keys--to-es2015/method-and-field/input.js
+* 2023-05-duplicated-keys--to-es2015/methods-with-same-key/input.js
+* 2023-05-exported/default-anonymous/input.mjs
+* 2023-05-exported/default-named/input.mjs
+* 2023-05-exported/member-decorator/input.mjs
+* 2023-05-exported/named/input.mjs
+* 2023-05-fields/context-name/input.js
+* 2023-05-fields/private/input.js
+* 2023-05-fields/public/input.js
+* 2023-05-fields/static-private/input.js
+* 2023-05-fields/static-public/input.js
+* 2023-05-fields--to-es2015/context-name/input.js
+* 2023-05-fields--to-es2015/private/input.js
+* 2023-05-fields--to-es2015/public/input.js
+* 2023-05-fields--to-es2015/static-private/input.js
+* 2023-05-fields--to-es2015/static-public/input.js
+* 2023-05-getters/context-name/input.js
+* 2023-05-getters/private/input.js
+* 2023-05-getters/public/input.js
+* 2023-05-getters/static-private/input.js
+* 2023-05-getters/static-public/input.js
+* 2023-05-getters--to-es2015/context-name/input.js
+* 2023-05-getters--to-es2015/private/input.js
+* 2023-05-getters--to-es2015/public/input.js
+* 2023-05-getters--to-es2015/static-private/input.js
+* 2023-05-getters--to-es2015/static-public/input.js
+* 2023-05-getters-and-setters/private/input.js
+* 2023-05-getters-and-setters/public/input.js
+* 2023-05-getters-and-setters/static-private/input.js
+* 2023-05-getters-and-setters/static-public/input.js
+* 2023-05-getters-and-setters--to-es2015/private/input.js
+* 2023-05-getters-and-setters--to-es2015/public/input.js
+* 2023-05-getters-and-setters--to-es2015/static-private/input.js
+* 2023-05-getters-and-setters--to-es2015/static-public/input.js
+* 2023-05-methods/context-name/input.js
+* 2023-05-methods/private/input.js
+* 2023-05-methods/public/input.js
+* 2023-05-methods/static-private/input.js
+* 2023-05-methods/static-public/input.js
+* 2023-05-methods--to-es2015/context-name/input.js
+* 2023-05-methods--to-es2015/private/input.js
+* 2023-05-methods--to-es2015/public/input.js
+* 2023-05-methods--to-es2015/static-private/input.js
+* 2023-05-methods--to-es2015/static-public/input.js
+* 2023-05-misc/all-decorators/input.js
+* 2023-05-misc/initProto-existing-derived-constructor/input.js
+* 2023-05-misc/initProto-existing-derived-constructor-multiple-super/input.js
+* 2023-05-misc/private-keys-in-enclosing-class/input.js
+* 2023-05-misc/setting-private-method/input.js
+* 2023-05-misc/setting-private-method-in-body/input.js
+* 2023-05-misc/setting-private-method-via-array-pattern/input.js
+* 2023-05-misc/setting-private-method-via-for-of/input.js
+* 2023-05-misc/setting-private-method-via-object-pattern/input.js
+* 2023-05-misc/setting-private-method-via-rest/input.js
+* 2023-05-misc/setting-private-method-via-update/input.js
+* 2023-05-misc/setting-shadowed-private-method-valid/input.js
+* 2023-05-misc/super-in-decorator/input.js
+* 2023-05-misc/super-in-nested-constructor-expression/input.js
+* 2023-05-misc/super-in-private-accessor/input.js
+* 2023-05-misc/super-in-private-method/input.js
+* 2023-05-misc/this/input.js
+* 2023-05-misc/valid-expression-formats/input.js
+* 2023-05-misc--to-es2015/initProto-existing-derived-constructor/input.js
+* 2023-05-misc--to-es2015/super-in-decorator/input.js
+* 2023-05-misc--to-es2015/this/input.js
+* 2023-05-misc--to-es2015/valid-expression-formats/input.js
+* 2023-05-ordering/initializers-and-static-blocks/input.js
+* 2023-05-ordering--to-es2015/initializers-and-static-blocks/input.js
+* 2023-05-setters/context-name/input.js
+* 2023-05-setters/private/input.js
+* 2023-05-setters/public/input.js
+* 2023-05-setters/static-private/input.js
+* 2023-05-setters/static-public/input.js
+* 2023-05-setters--to-es2015/context-name/input.js
+* 2023-05-setters--to-es2015/private/input.js
+* 2023-05-setters--to-es2015/public/input.js
+* 2023-05-setters--to-es2015/static-private/input.js
+* 2023-05-setters--to-es2015/static-public/input.js
+* legacy-decl-to-expression/class-decorators/input.mjs
+* legacy-decl-to-expression/method-decorators/input.mjs
+* legacy-decl-to-expression/no-decorators/input.mjs
+* legacy-regression/10264/input.mjs
+* legacy-regression/7030/input.js
+* legacy-regression/8041/input.mjs
+* legacy-regression/8559/input.mjs
+

tasks/transform_conformance/babel_exec.snap.md

@@ -1,4 +1,4 @@
-Passed: 386/454
+Passed: 428/649
 
 # All Passed:
 * babel-plugin-transform-class-static-block
@@ -102,3 +102,158 @@ Passed: 386/454
 * general/class-properties/exec.js
 * general/class-properties-loose/exec.js
 
+# babel-plugin-proposal-decorators (42/195)
+* 2021-12-fields/context-name/exec.js
+* 2021-12-fields--to-es2015/context-name/exec.js
+* 2021-12-getters/context-name/exec.js
+* 2021-12-getters--to-es2015/context-name/exec.js
+* 2021-12-methods/context-name/exec.js
+* 2021-12-methods--to-es2015/context-name/exec.js
+* 2021-12-misc/decorator-evaluation-scope/exec.js
+* 2021-12-misc/initProto-existing-derived-constructor/exec.js
+* 2021-12-misc--to-es2015/accessor-old-initializer-prop-support/exec.js
+* 2021-12-setters/context-name/exec.js
+* 2021-12-setters--to-es2015/context-name/exec.js
+* 2022-03-classes/decorator-access-modified-fields/exec.js
+* 2022-03-classes/decorator-access-modified-methods/exec.js
+* 2022-03-fields/context-name/exec.js
+* 2022-03-fields--to-es2015/context-name/exec.js
+* 2022-03-getters/context-name/exec.js
+* 2022-03-getters--to-es2015/context-name/exec.js
+* 2022-03-methods/context-name/exec.js
+* 2022-03-methods--to-es2015/context-name/exec.js
+* 2022-03-misc/decorator-evaluation-scope/exec.js
+* 2022-03-misc/initProto-existing-derived-constructor/exec.js
+* 2022-03-misc/initializer-property-ignored/exec.js
+* 2022-03-setters/context-name/exec.js
+* 2022-03-setters--to-es2015/context-name/exec.js
+* 2023-01-classes/decorator-access-modified-fields/exec.js
+* 2023-01-classes/decorator-access-modified-methods/exec.js
+* 2023-01-fields/context-name/exec.js
+* 2023-01-fields--to-es2015/context-name/exec.js
+* 2023-01-getters/context-name/exec.js
+* 2023-01-getters--to-es2015/context-name/exec.js
+* 2023-01-methods/context-name/exec.js
+* 2023-01-methods--to-es2015/context-name/exec.js
+* 2023-01-misc/decorator-evaluation-scope/exec.js
+* 2023-01-misc/initProto-existing-derived-constructor/exec.js
+* 2023-01-misc/initializer-property-ignored/exec.js
+* 2023-01-setters/context-name/exec.js
+* 2023-01-setters--to-es2015/context-name/exec.js
+* 2023-05-accessors--to-es2015/private/exec.js
+* 2023-05-accessors--to-es2015/public/exec.js
+* 2023-05-accessors--to-es2015/undecorated-private/exec.js
+* 2023-05-accessors--to-es2015/undecorated-public/exec.js
+* 2023-05-classes/ctx/exec.js
+* 2023-05-classes/decorator-access-modified-classes/exec.js
+* 2023-05-classes/decorator-access-modified-fields/exec.js
+* 2023-05-classes/decorator-access-modified-methods/exec.js
+* 2023-05-classes--to-es2015/ctx/exec.js
+* 2023-05-classes--to-es2015/decorator-access-modified-classes/exec.js
+* 2023-05-classes--to-es2015/decorator-access-modified-fields/exec.js
+* 2023-05-classes--to-es2015/decorator-access-modified-methods/exec.js
+* 2023-05-classes--to-es2015/inheritance/exec.js
+* 2023-05-classes--to-es2015/initializers/exec.js
+* 2023-05-classes--to-es2015/replacement/exec.js
+* 2023-05-classes--to-es2015/replacement-static-installed-on-correct-class/exec.js
+* 2023-05-classes--to-es2015/replacement-static-this/exec.js
+* 2023-05-classes--to-es2015/replacement-with-expr/exec.js
+* 2023-05-duplicated-keys--to-es2015/computed-keys-same-ast/exec.js
+* 2023-05-duplicated-keys--to-es2015/computed-keys-same-value/exec.js
+* 2023-05-duplicated-keys--to-es2015/method-and-field/exec.js
+* 2023-05-duplicated-keys--to-es2015/methods-with-same-key/exec.js
+* 2023-05-fields/context-name/exec.js
+* 2023-05-fields--to-es2015/context-name/exec.js
+* 2023-05-fields--to-es2015/private/exec.js
+* 2023-05-fields--to-es2015/public/exec.js
+* 2023-05-fields--to-es2015/static-private/exec.js
+* 2023-05-fields--to-es2015/static-public/exec.js
+* 2023-05-getters/context-name/exec.js
+* 2023-05-getters--to-es2015/context-name/exec.js
+* 2023-05-getters--to-es2015/private/exec.js
+* 2023-05-getters--to-es2015/public/exec.js
+* 2023-05-getters--to-es2015/static-private/exec.js
+* 2023-05-getters--to-es2015/static-public/exec.js
+* 2023-05-getters-and-setters--to-es2015/private/exec.js
+* 2023-05-getters-and-setters--to-es2015/public/exec.js
+* 2023-05-getters-and-setters--to-es2015/static-private/exec.js
+* 2023-05-getters-and-setters--to-es2015/static-public/exec.js
+* 2023-05-methods/context-name/exec.js
+* 2023-05-methods--to-es2015/context-name/exec.js
+* 2023-05-methods--to-es2015/private/exec.js
+* 2023-05-methods--to-es2015/private-with-initializers/exec.js
+* 2023-05-methods--to-es2015/public/exec.js
+* 2023-05-methods--to-es2015/public-with-initializers/exec.js
+* 2023-05-methods--to-es2015/static-private/exec.js
+* 2023-05-methods--to-es2015/static-private-with-initializers/exec.js
+* 2023-05-methods--to-es2015/static-public/exec.js
+* 2023-05-methods--to-es2015/static-public-with-initializers/exec.js
+* 2023-05-misc/class-tdz-during-decorators/exec.js
+* 2023-05-misc/decorator-evaluation-scope/exec.js
+* 2023-05-misc/initProto-existing-derived-constructor/exec.js
+* 2023-05-misc/initializer-property-ignored/exec.js
+* 2023-05-misc/this/exec.js
+* 2023-05-misc--to-es2015/class-and-method-decorators/exec.js
+* 2023-05-misc--to-es2015/class-and-property-decorators/exec.js
+* 2023-05-misc--to-es2015/decorator-evaluation-scope/exec.js
+* 2023-05-misc--to-es2015/initProto-existing-derived-constructor/exec.js
+* 2023-05-misc--to-es2015/initializer-property-ignored/exec.js
+* 2023-05-misc--to-es2015/initializer-timing/exec.js
+* 2023-05-misc--to-es2015/leaked-context-addInitializer/exec.js
+* 2023-05-misc--to-es2015/leaked-context-addInitializer-throw/exec.js
+* 2023-05-misc--to-es2015/this/exec.js
+* 2023-05-ordering/accessor-init-and-set-consistent/exec.js
+* 2023-05-ordering/accessor-initializers-fields/exec.js
+* 2023-05-ordering/accessor-initializers-setters/exec.js
+* 2023-05-ordering/accessor-method-initializers/exec.js
+* 2023-05-ordering/accessor-static-method-initializers/exec.js
+* 2023-05-ordering/field/exec.js
+* 2023-05-ordering/field-initializers-after-methods/exec.js
+* 2023-05-ordering/static-field-initializers-after-methods/exec.js
+* 2023-05-ordering--to-es2015/accessor-initializers-fields/exec.js
+* 2023-05-ordering--to-es2015/accessor-initializers-setters/exec.js
+* 2023-05-ordering--to-es2015/accessor-method-initializers/exec.js
+* 2023-05-ordering--to-es2015/accessor-static-method-initializers/exec.js
+* 2023-05-ordering--to-es2015/field/exec.js
+* 2023-05-ordering--to-es2015/field-initializers-after-methods/exec.js
+* 2023-05-ordering--to-es2015/static-field-initializers-after-methods/exec.js
+* 2023-05-runtime-errors--to-es2015/invalid-accessor-decorator-return/exec.js
+* 2023-05-runtime-errors--to-es2015/invalid-add-initializer/exec.js
+* 2023-05-runtime-errors--to-es2015/invalid-class-decorator-return/exec.js
+* 2023-05-runtime-errors--to-es2015/invalid-field-decorator-return/exec.js
+* 2023-05-runtime-errors--to-es2015/invalid-getter-decorator-return/exec.js
+* 2023-05-runtime-errors--to-es2015/invalid-method-decorator-return/exec.js
+* 2023-05-runtime-errors--to-es2015/invalid-setter-decorator-return/exec.js
+* 2023-05-setters/context-name/exec.js
+* 2023-05-setters--to-es2015/context-name/exec.js
+* 2023-05-setters--to-es2015/private/exec.js
+* 2023-05-setters--to-es2015/public/exec.js
+* 2023-05-setters--to-es2015/static-private/exec.js
+* 2023-05-setters--to-es2015/static-public/exec.js
+* legacy-class-export-default/exec.mjs
+* legacy-class-ordering/order/exec.js
+* legacy-class-ordering/reverse-order/exec.js
+* legacy-class-prototype-methods/mutate-descriptor/exec.js
+* legacy-class-prototype-methods/numeric-props/exec.js
+* legacy-class-prototype-methods/return-descriptor/exec.js
+* legacy-class-prototype-methods/string-props/exec.js
+* legacy-class-prototype-properties/child-classes-properties/exec.js
+* legacy-class-prototype-properties/mutate-descriptor/exec.js
+* legacy-class-prototype-properties/mutate-initialzer/exec.js
+* legacy-class-prototype-properties/properties-without-initializer/exec.js
+* legacy-class-prototype-properties/return-descriptor/exec.js
+* legacy-class-prototype-properties/string-literal-properties/exec.js
+* legacy-class-static-methods/mutate-descriptor/exec.js
+* legacy-class-static-methods/numeric-props/exec.js
+* legacy-class-static-methods/return-descriptor/exec.js
+* legacy-class-static-methods/string-props/exec.js
+* legacy-class-static-properties/mutate-descriptor/exec.js
+* legacy-class-static-properties/mutate-initialzer/exec.js
+* legacy-class-static-properties/properties-without-initializer/exec.js
+* legacy-class-static-properties/return-descriptor/exec.js
+* legacy-regression/8512/exec.js
+* metadata/class/exec.js
+* metadata/element/exec.js
+* metadata/subclass-no-super-decorators/exec.js
+* metadata/subclass-super-decorators/exec.js
+

tasks/transform_conformance/src/lib.rs

@@ -89,6 +89,8 @@ const CASES: &[&str] = &[
     "babel-plugin-transform-typescript",
     // React
     "babel-plugin-transform-react-jsx",
+    // Proposal
+    "babel-plugin-proposal-decorators",
 ];
 
 const EXCLUDE_TESTS: &[&str] = &["babel-plugin-transform-typescript/test/fixtures/enum"];

tasks/transform_conformance/src/test_case.rs

@@ -11,8 +11,8 @@ use oxc_semantic::SemanticBuilder;
 use oxc_span::{SourceType, VALID_EXTENSIONS};
 use oxc_tasks_common::{normalize_path, print_diff_in_terminal, BabelOptions};
 use oxc_transformer::{
-    ArrowFunctionsOptions, NullishCoalescingOperatorOptions, ReactJsxOptions, TransformOptions,
+    ArrowFunctionsOptions, DecoratorsOptions, NullishCoalescingOperatorOptions, ReactJsxOptions,
-    TransformTarget, Transformer, TypescriptOptions,
+    TransformOptions, TransformTarget, Transformer, TypescriptOptions,
 };
 use serde::de::DeserializeOwned;
 use serde_json::Value;
@@ -89,6 +89,9 @@ pub trait TestCase {
         TransformOptions {
             target: TransformTarget::ESNext,
             babel_8_breaking: options.babel_8_breaking,
+            decorators: options
+                .get_plugin("proposal-decorators")
+                .map(get_options::<DecoratorsOptions>),
             react_jsx: options
                 .get_plugin("transform-react-jsx")
                 .map(get_options::<ReactJsxOptions>),