refactor: remove map: undefined from addRefreshWrapper

Author: sapphi-red

packages/common/refresh-utils.ts

@@ -18,10 +18,10 @@ export const avoidSourceMapOption = Symbol()
 
 export function addRefreshWrapper<M extends { mappings: string }>(
   code: string,
-  map: M | string | undefined | typeof avoidSourceMapOption,
+  map: M | string | typeof avoidSourceMapOption,
   pluginName: string,
   id: string,
-): { code: string; map: M | null | undefined | string } {
+): { code: string; map: M | null | string } {
   const hasRefresh = refreshContentRE.test(code)
   const onlyReactComp = !hasRefresh && reactCompRE.test(code)
   const normalizedMap = map === avoidSourceMapOption ? null : map

packages/plugin-react/src/index.ts

@@ -255,7 +255,7 @@ export default function viteReact(opts: Options = {}): PluginOption[] {
         }
         return addRefreshWrapper(
           result.code!,
-          result.map ?? undefined,
+          result.map!,
           '@vitejs/plugin-react',
           id,
         )