fix(nuxt3): only treeshake macro exports when building (#2809)

packages/nuxt3/src/pages/macros.ts

@@ -4,6 +4,7 @@ import { findStaticImports, findExports } from 'mlly'
 
 export interface TransformMacroPluginOptions {
   macros: Record<string, string>
+  dev?: boolean
 }
 
 export const TransformMacroPlugin = createUnplugin((options: TransformMacroPluginOptions) => {
@@ -42,7 +43,7 @@ export const TransformMacroPlugin = createUnplugin((options: TransformMacroPlugi
         if (match.specifier && match._type === 'named') {
           // [webpack] Export named exports rather than the default (component)
           return code.replace(match.code, `export {${Object.values(options.macros).join(', ')}} from "${match.specifier}"`)
-        } else {
+        } else if (!options.dev) {
           // ensure we tree-shake any _other_ default exports out of the macro script
           code = code.replace(match.code, '/*#__PURE__*/ false &&')
           code += '\nexport default {}'

packages/nuxt3/src/pages/module.ts

@@ -47,6 +47,7 @@ export default defineNuxtModule({
 
     // Extract macros from pages
     const macroOptions: TransformMacroPluginOptions = {
+      dev: nuxt.options.dev,
       macros: {
         definePageMeta: 'meta'
       }