Fix dest already exists error during Vite build (#9305)

.changeset/five-planets-grin.md

@@ -0,0 +1,5 @@
+---
+"@remix-run/dev": patch
+---
+
+Fix `dest already exists` error when running `remix vite:build`

packages/remix-dev/vite/plugin.ts

@@ -830,6 +830,11 @@ export const remixVitePlugin: RemixVitePlugin = (remixUserConfig = {}) => {
     return JSON.parse(manifestContents) as Vite.Manifest;
   };
 
+  let getViteManifestFilePaths = (viteManifest: Vite.Manifest): Set<string> => {
+    let filePaths = Object.values(viteManifest).map((chunk) => chunk.file);
+    return new Set(filePaths);
+  };
+
   let getViteManifestAssetPaths = (
     viteManifest: Vite.Manifest
   ): Set<string> => {
@@ -1401,7 +1406,7 @@ export const remixVitePlugin: RemixVitePlugin = (remixUserConfig = {}) => {
           let ssrViteManifest = await loadViteManifest(serverBuildDirectory);
           let clientViteManifest = await loadViteManifest(clientBuildDirectory);
 
-          let clientAssetPaths = getViteManifestAssetPaths(clientViteManifest);
+          let clientFilePaths = getViteManifestFilePaths(clientViteManifest);
           let ssrAssetPaths = getViteManifestAssetPaths(ssrViteManifest);
 
           // We only move assets that aren't in the client build, otherwise we
@@ -1413,7 +1418,7 @@ export const remixVitePlugin: RemixVitePlugin = (remixUserConfig = {}) => {
           let movedAssetPaths: string[] = [];
           for (let ssrAssetPath of ssrAssetPaths) {
             let src = path.join(serverBuildDirectory, ssrAssetPath);
-            if (!clientAssetPaths.has(ssrAssetPath)) {
+            if (!clientFilePaths.has(ssrAssetPath)) {
               let dest = path.join(clientBuildDirectory, ssrAssetPath);
               await fse.move(src, dest);
               movedAssetPaths.push(dest);