fix(swc): don't set missing class fields

SWC adopts ESNext behaviour of explicitly setting fields as `undefined` by default. Disabling this behaviour aligns better with TS that targets ES2021

Author: rickdgeerling

lib/compiler/defaults/swc-defaults.ts

@@ -25,6 +25,7 @@ export const swcDefaultsFactory = (
         transform: {
           legacyDecorator: true,
           decoratorMetadata: true,
+          useDefineForClassFields: false
         },
         keepClassNames: true,
         baseUrl: tsOptions?.baseUrl,