From 62bac644e1586eaa3963573613560ddf1294dc35 Mon Sep 17 00:00:00 2001
From: Zakir Motala <zakirhusseinmotala76@gmail.com>
Date: Thu, 16 Apr 2026 23:00:45 +0200
Subject: [PATCH] refactor: extract shared compiler options resolution logic

Removes code duplication between runtime-core and server-renderer by introducing a shared getResolvedCompilerOptions helper. This addresses a TODO in ssrCompile.ts and improves maintainability.
---
 packages/runtime-core/src/component.ts        | 36 ++++++++++++-------
 packages/runtime-core/src/index.ts            |  3 ++
 .../server-renderer/src/helpers/ssrCompile.ts | 17 ++-------
 3 files changed, 28 insertions(+), 28 deletions(-)

diff --git a/packages/runtime-core/src/component.ts b/packages/runtime-core/src/component.ts
index 4e1aa5e4d38..847ca72d260 100644
--- a/packages/runtime-core/src/component.ts
+++ b/packages/runtime-core/src/component.ts
@@ -983,6 +983,28 @@ export function registerRuntimeCompiler(_compile: any): void {
 // dev only
 export const isRuntimeOnly = (): boolean => !compile
 
+/**
+ * @internal
+ */
+export function getResolvedCompilerOptions(
+  instance: ComponentInternalInstance,
+): CompilerOptions {
+  const Component = instance.type as ComponentOptions
+  const { isCustomElement, compilerOptions } = instance.appContext.config
+  const { delimiters, compilerOptions: componentCompilerOptions } = Component
+
+  return extend(
+    extend(
+      {
+        isCustomElement,
+        delimiters,
+      },
+      compilerOptions,
+    ),
+    componentCompilerOptions,
+  )
+}
+
 export function finishComponentSetup(
   instance: ComponentInternalInstance,
   isSSR: boolean,
@@ -1014,19 +1036,7 @@ export function finishComponentSetup(
         if (__DEV__) {
           startMeasure(instance, `compile`)
         }
-        const { isCustomElement, compilerOptions } = instance.appContext.config
-        const { delimiters, compilerOptions: componentCompilerOptions } =
-          Component
-        const finalCompilerOptions: CompilerOptions = extend(
-          extend(
-            {
-              isCustomElement,
-              delimiters,
-            },
-            compilerOptions,
-          ),
-          componentCompilerOptions,
-        )
+        const finalCompilerOptions = getResolvedCompilerOptions(instance)
         if (__COMPAT__) {
           // pass runtime compat config into the compiler
           finalCompilerOptions.compatConfig = Object.create(globalCompatConfig)
diff --git a/packages/runtime-core/src/index.ts b/packages/runtime-core/src/index.ts
index c8468334e33..1bfb87936b9 100644
--- a/packages/runtime-core/src/index.ts
+++ b/packages/runtime-core/src/index.ts
@@ -395,6 +395,7 @@ export { transformVNodeArgs } from './vnode'
 import {
   createComponentInstance,
   getComponentPublicInstance,
+  getResolvedCompilerOptions,
   setupComponent,
 } from './component'
 import { renderComponentRoot } from './componentRenderUtils'
@@ -414,6 +415,7 @@ const _ssrUtils: {
   ensureValidVNode: typeof ensureValidVNode
   pushWarningContext: typeof pushWarningContext
   popWarningContext: typeof popWarningContext
+  getResolvedCompilerOptions: typeof getResolvedCompilerOptions
 } = {
   createComponentInstance,
   setupComponent,
@@ -425,6 +427,7 @@ const _ssrUtils: {
   ensureValidVNode,
   pushWarningContext,
   popWarningContext,
+  getResolvedCompilerOptions,
 }
 
 /**
diff --git a/packages/server-renderer/src/helpers/ssrCompile.ts b/packages/server-renderer/src/helpers/ssrCompile.ts
index 8412a65e843..066d02e5c3a 100644
--- a/packages/server-renderer/src/helpers/ssrCompile.ts
+++ b/packages/server-renderer/src/helpers/ssrCompile.ts
@@ -1,6 +1,7 @@
 import {
   type ComponentInternalInstance,
   type ComponentOptions,
+  ssrUtils,
   warn,
 } from 'vue'
 import { compile } from '@vue/compiler-ssr'
@@ -32,21 +33,7 @@ export function ssrCompile(
     )
   }
 
-  // TODO: This is copied from runtime-core/src/component.ts and should probably be refactored
-  const Component = instance.type as ComponentOptions
-  const { isCustomElement, compilerOptions } = instance.appContext.config
-  const { delimiters, compilerOptions: componentCompilerOptions } = Component
-
-  const finalCompilerOptions: CompilerOptions = extend(
-    extend(
-      {
-        isCustomElement,
-        delimiters,
-      },
-      compilerOptions,
-    ),
-    componentCompilerOptions,
-  )
+  const finalCompilerOptions = ssrUtils.getResolvedCompilerOptions(instance)
 
   finalCompilerOptions.isCustomElement =
     finalCompilerOptions.isCustomElement || NO