fix(es/codegen): Emit ? for an optional computed property (#8481)

**Description:**

Emits optional `?` for a computed property.

Author: dsherret

crates/swc_ecma_codegen/src/lib.rs

@@ -1566,10 +1566,12 @@ where
         }
 
         emit!(n.key);
+
+        if n.is_optional {
+            punct!("?");
+        }
+
         if let Some(type_ann) = &n.type_ann {
-            if n.is_optional {
-                punct!("?");
-            }
             if n.definite {
                 punct!("!");
             }
@@ -1635,6 +1637,12 @@ where
 
         emit!(n.key);
 
+        // emit for a computed property, but not an identifier already marked as
+        // optional
+        if n.is_optional && !n.key.as_ident().map(|i| i.optional).unwrap_or(false) {
+            punct!("?");
+        }
+
         if let Some(ty) = &n.type_ann {
             if n.definite {
                 punct!("!");

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

@@ -3,9 +3,11 @@ class MyClass extends Base {
     prop2!: string;
     #prop3?: string;
     #prop4?: string = "test";
+    #privateOptionalNoType?;
     static readonly prop5!: string;
     readonly #prop6 = "asdf";
     public abstract override readonly prop7 = 5;
     override readonly #prop8 = 5;
     declare public static readonly prop9: string;
+    [value]?: string[];
 }

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

@@ -3,9 +3,11 @@ class MyClass extends Base {
     prop2!: string;
     #prop3?: string;
     #prop4?: string = "test";
+    #privateOptionalNoType?;
     static readonly prop5!: string;
     readonly #prop6 = "asdf";
     public abstract override readonly prop7 = 5;
     override readonly #prop8 = 5;
     declare public static readonly prop9: string;
+    [value]?: string[];
 }