fix(es/codegen): Fix codegen of classes with minify enabled (#1767)

Author: Shinyaigeek

ecmascript/codegen/Cargo.toml

@@ -7,7 +7,7 @@ include = ["Cargo.toml", "src/**/*.rs"]
 license = "Apache-2.0/MIT"
 name = "swc_ecma_codegen"
 repository = "https://github.com/swc-project/swc.git"
-version = "0.55.3"
+version = "0.55.4"
 
 [dependencies]
 bitflags = "1"

ecmascript/codegen/src/decl.rs

@@ -37,7 +37,6 @@ impl<'a> Emitter<'a> {
         space!();
         emit!(node.ident);
         emit!(node.class.type_params);
-        formatting_space!();
 
         self.emit_class_trailing(&node.class)?;
     }
@@ -117,6 +116,15 @@ mod tests {
         );
     }
 
+    #[test]
+    fn issue_1764() {
+        assert_min(
+            "class Hoge {};
+class HogeFuga extends Hoge {};",
+            "class Hoge{};class HogeFuga extends Hoge{};",
+        );
+    }
+
     #[test]
     fn single_argument_arrow_expression() {
         assert_min("function* f(){ yield x => x}", "function*f(){yield x=>x}");

ecmascript/codegen/src/lib.rs

@@ -823,10 +823,6 @@ impl<'a> Emitter<'a> {
             space!();
             emit!(i);
             emit!(node.class.type_params);
-
-            formatting_space!();
-        } else {
-            space!();
         }
 
         self.emit_class_trailing(&node.class)?;
@@ -835,12 +831,13 @@ impl<'a> Emitter<'a> {
     #[emitter]
     fn emit_class_trailing(&mut self, node: &Class) -> Result {
         if node.super_class.is_some() {
+            space!();
             keyword!("extends");
             space!();
             emit!(node.super_class);
-            space!();
         }
 
+        formatting_space!();
         punct!("{");
         self.emit_list(node.span, Some(&node.body), ListFormat::ClassMembers)?;
         punct!("}");