fix(es/codegen): Emit abstract keyword (#8479)

crates/swc_ecma_codegen/src/decl.rs

@@ -73,6 +73,11 @@ where
             }
         }
 
+        if node.class.is_abstract {
+            keyword!(self, "abstract");
+            space!(self);
+        }
+
         keyword!(self, "class");
         space!(self);
         emit!(self, node.ident);

crates/swc_ecma_codegen/src/lib.rs

@@ -1467,6 +1467,11 @@ where
             }
         }
 
+        if n.is_abstract {
+            keyword!("abstract");
+            space!()
+        }
+
         if n.is_override {
             keyword!("override");
             space!()
@@ -1608,6 +1613,11 @@ where
             space!();
         }
 
+        if n.is_abstract {
+            keyword!("abstract");
+            space!()
+        }
+
         if n.is_override {
             keyword!("override");
             space!()

crates/swc_ecma_codegen/tests/fixture/typescript/class/input.js

@@ -0,0 +1,4 @@
+abstract class A {
+}
+export abstract class B {
+}

crates/swc_ecma_codegen/tests/fixture/typescript/class/output.js

@@ -0,0 +1,4 @@
+abstract class A {
+}
+export abstract class B {
+}

crates/swc_ecma_codegen/tests/fixture/typescript/class/output.min.js

@@ -0,0 +1 @@
+abstract class A{}export abstract class B{}

crates/swc_ecma_codegen/tests/fixture/typescript/class_method/input.js

@@ -1,4 +1,5 @@
 class MyClass extends Base {
     public override method(param: number): string {
     }
+    public abstract override log(msg: string): void;
 }

crates/swc_ecma_codegen/tests/fixture/typescript/class_method/output.js

@@ -1,3 +1,4 @@
 class MyClass extends Base {
     public override method(param: number): string {}
+    public abstract override log(msg: string): void;
 }

crates/swc_ecma_codegen/tests/fixture/typescript/class_method/output.min.js

@@ -1 +1 @@
-class MyClass extends Base{public override method(param:number):string{}}
+class MyClass extends Base{public override method(param:number):string{}public abstract override log(msg:string):void}

crates/swc_ecma_codegen/tests/fixture/typescript/class_prop/input.js

@@ -5,6 +5,6 @@ class MyClass extends Base {
     #prop4?: string = "test";
     static readonly prop5!: string;
     readonly #prop6 = "asdf";
-    public override readonly prop7 = 5;
+    public abstract override readonly prop7 = 5;
     override readonly #prop8 = 5;
 }

crates/swc_ecma_codegen/tests/fixture/typescript/class_prop/output.js

@@ -5,6 +5,6 @@ class MyClass extends Base {
     #prop4?: string = "test";
     static readonly prop5!: string;
     readonly #prop6 = "asdf";
-    public override readonly prop7 = 5;
+    public abstract override readonly prop7 = 5;
     override readonly #prop8 = 5;
 }

crates/swc_ecma_codegen/tests/fixture/typescript/class_prop/output.min.js

@@ -1 +1 @@
-class MyClass extends Base{prop1?: string;prop2!: string;#prop3?: string;#prop4?: string="test";static readonly prop5!: string;readonly #prop6="asdf";public override readonly prop7=5;override readonly #prop8=5}
+class MyClass extends Base{prop1?: string;prop2!: string;#prop3?: string;#prop4?: string="test";static readonly prop5!: string;readonly #prop6="asdf";public abstract override readonly prop7=5;override readonly #prop8=5}

crates/swc_ecma_transforms_base/tests/ts-resolver/stc/1/output.ts

@@ -1,11 +1,11 @@
 interface Mixin1__2 {
     mixinMethod__0(): void;
 }
-class AbstractBase__2 {
-    abstractBaseMethod(): void;
+abstract class AbstractBase__2 {
+    abstract abstractBaseMethod(): void;
 }
 function Mixin2__2<TBase__4 extends abstract new(...args: any[]) => any>(baseClass__4: TBase__4) {
-    class MixinClass__4 extends baseClass__4 implements Mixin1__2 {
+    abstract class MixinClass__4 extends baseClass__4 implements Mixin1__2 {
         mixinMethod(): void {}
         static staticMixinMethod(): void {}
     }

crates/swc_ecma_transforms_typescript/src/strip_type.rs

@@ -138,13 +138,15 @@ impl VisitMut for StripType {
     fn visit_mut_class_method(&mut self, n: &mut ClassMethod) {
         n.accessibility = None;
         n.is_override = false;
+        n.is_abstract = false;
         n.visit_mut_children_with(self);
     }
 
     fn visit_mut_class_prop(&mut self, prop: &mut ClassProp) {
         prop.readonly = false;
         prop.is_override = false;
         prop.is_optional = false;
+        prop.is_abstract = false;
         prop.definite = false;
         prop.accessibility = None;
         prop.visit_mut_children_with(self);