refactor: simplify the code

packages/open-next/src/adapters/config/util.ts

@@ -22,7 +22,7 @@ export function loadBuildId(nextDir: string) {
 }
 
 export function loadHtmlPages(nextDir: string) {
-  const filePath = path.join(nextDir, "server", "pages-manifest.json");
+  const filePath = path.join(nextDir, "server/pages-manifest.json");
   const json = fs.readFileSync(filePath, "utf-8");
   return Object.entries(JSON.parse(json))
     .filter(([_, value]) => (value as string).endsWith(".html"))
@@ -81,8 +81,7 @@ export function loadPrerenderManifest(nextDir: string) {
 export function loadAppPathsManifest(nextDir: string) {
   const appPathsManifestPath = path.join(
     nextDir,
-    "server",
-    "app-paths-manifest.json",
+    "server/app-paths-manifest.json",
   );
   const appPathsManifestJson = fs.existsSync(appPathsManifestPath)
     ? fs.readFileSync(appPathsManifestPath, "utf-8")
@@ -120,7 +119,7 @@ export function loadAppPathsManifestKeys(nextDir: string) {
 }
 
 export function loadMiddlewareManifest(nextDir: string) {
-  const filePath = path.join(nextDir, "server", "middleware-manifest.json");
+  const filePath = path.join(nextDir, "server/middleware-manifest.json");
   const json = fs.readFileSync(filePath, "utf-8");
   return JSON.parse(json) as MiddlewareManifest;
 }

packages/open-next/src/build/copyTracedFiles.ts

@@ -12,8 +12,8 @@ import {
   writeFileSync,
 } from "node:fs";
 import path from "node:path";
-import type { NextConfig, PrerenderManifest } from "types/next-types";
 
+import { loadConfig, loadPrerenderManifest } from "config/util.js";
 import logger from "../logger.js";
 import { MIDDLEWARE_TRACE_FILE } from "./constant.js";
 
@@ -47,6 +47,7 @@ export async function copyTracedFiles({
   const dotNextDir = path.join(buildOutputPath, ".next");
   const standaloneDir = path.join(dotNextDir, "standalone");
   const standaloneNextDir = path.join(standaloneDir, packagePath, ".next");
+  const standaloneServerDir = path.join(standaloneNextDir, "server");
   const outputNextDir = path.join(outputDir, packagePath, ".next");
 
   const extractFiles = (files: string[], from = standaloneNextDir) =>
@@ -75,12 +76,12 @@ export async function copyTracedFiles({
     });
   }
   // create directory for pages
-  if (existsSync(path.join(standaloneDir, ".next/server/pages"))) {
+  if (existsSync(path.join(standaloneServerDir, "pages"))) {
     mkdirSync(path.join(outputNextDir, "server/pages"), {
       recursive: true,
     });
   }
-  if (existsSync(path.join(standaloneDir, ".next/server/app"))) {
+  if (existsSync(path.join(standaloneServerDir, "app"))) {
     mkdirSync(path.join(outputNextDir, "server/app"), {
       recursive: true,
     });
@@ -239,17 +240,15 @@ File ${fullFilePath} does not exist
 
   mkdirSync(path.join(outputNextDir, "server"), { recursive: true });
 
-  readdirSync(path.join(standaloneNextDir, "server"))
+  readdirSync(standaloneServerDir)
     .filter(
       (fileOrDir) =>
-        !statSync(
-          path.join(standaloneNextDir, "server", fileOrDir),
-        ).isDirectory(),
+        !statSync(path.join(standaloneServerDir, fileOrDir)).isDirectory(),
     )
     .filter((file) => file !== "server.js")
     .forEach((file) =>
       copyFileSync(
-        path.join(standaloneNextDir, "server", file),
+        path.join(standaloneServerDir, file),
         path.join(path.join(outputNextDir, "server"), file),
       ),
     );
@@ -285,24 +284,14 @@ File ${fullFilePath} does not exist
     const staticFiles: Array<string> = Object.values(
       JSON.parse(
         readFileSync(
-          path.join(standaloneNextDir, "server/pages-manifest.json"),
+          path.join(standaloneServerDir, "pages-manifest.json"),
           "utf8",
         ),
       ),
     );
     // Then we need to get all fallback: true dynamic routes html
-    const prerenderManifest = JSON.parse(
-      readFileSync(
-        path.join(standaloneNextDir, "prerender-manifest.json"),
-        "utf8",
-      ),
-    ) as PrerenderManifest;
-    const config = JSON.parse(
-      readFileSync(
-        path.join(standaloneNextDir, "required-server-files.json"),
-        "utf8",
-      ),
-    ).config as NextConfig;
+    const prerenderManifest = loadPrerenderManifest(standaloneNextDir);
+    const config = loadConfig(standaloneNextDir);
     const locales = config.i18n?.locales;
     Object.values(prerenderManifest.dynamicRoutes).forEach((route) => {
       if (typeof route.fallback === "string") {

packages/open-next/src/build/createMiddleware.ts

@@ -1,12 +1,12 @@
 import fs from "node:fs";
 import path from "node:path";
 
-import { loadFunctionsConfigManifest } from "config/util.js";
+import {
+  loadFunctionsConfigManifest,
+  loadMiddlewareManifest,
+} from "config/util.js";
 import logger from "../logger.js";
-import type {
-  MiddlewareInfo,
-  MiddlewareManifest,
-} from "../types/next-types.js";
+import type { MiddlewareInfo } from "../types/next-types.js";
 import { buildEdgeBundle } from "./edge/createEdgeBundle.js";
 import * as buildHelper from "./helper.js";
 import { installDependencies } from "./installDeps.js";
@@ -27,15 +27,11 @@ export async function createMiddleware(
 ) {
   logger.info("Bundling middleware function...");
 
-  const { appBuildOutputPath, config, outputDir } = options;
+  const { config, outputDir } = options;
+  const buildOutputDotNextDir = path.join(options.appBuildOutputPath, ".next");
 
   // Get middleware manifest
-  const middlewareManifest = JSON.parse(
-    fs.readFileSync(
-      path.join(appBuildOutputPath, ".next/server/middleware-manifest.json"),
-      "utf8",
-    ),
-  ) as MiddlewareManifest;
+  const middlewareManifest = loadMiddlewareManifest(buildOutputDotNextDir);
 
   const edgeMiddlewareInfo = middlewareManifest.middleware["/"] as
     | MiddlewareInfo
@@ -44,7 +40,7 @@ export async function createMiddleware(
   if (!edgeMiddlewareInfo) {
     // If there is no middleware info, it might be a node middleware
     const functionsConfigManifest = loadFunctionsConfigManifest(
-      path.join(appBuildOutputPath, ".next"),
+      buildOutputDotNextDir,
     );
 
     if (functionsConfigManifest?.functions["/_middleware"]) {

packages/open-next/src/build/edge/createEdgeBundle.ts

@@ -3,7 +3,7 @@ import { mkdirSync } from "node:fs";
 import fs from "node:fs";
 import path from "node:path";
 import { build } from "esbuild";
-import type { MiddlewareInfo, MiddlewareManifest } from "types/next-types";
+import type { MiddlewareInfo } from "types/next-types";
 import type {
   IncludedConverter,
   IncludedOriginResolver,
@@ -13,6 +13,7 @@ import type {
   SplittedFunctionOptions,
 } from "types/open-next";
 
+import { loadMiddlewareManifest } from "config/util.js";
 import type { OriginResolver } from "types/overrides.js";
 import logger from "../../logger.js";
 import { openNextEdgePlugins } from "../../plugins/edge.js";
@@ -173,23 +174,19 @@ export async function generateEdgeBundle(
   options: BuildOptions,
   fnOptions: SplittedFunctionOptions,
 ) {
-  const { appBuildOutputPath, outputDir } = options;
   logger.info(`Generating edge bundle for: ${name}`);
 
+  const buildOutputDotNextDir = path.join(options.appBuildOutputPath, ".next");
+
   // Create output folder
-  const outputPath = path.join(outputDir, "server-functions", name);
-  fs.mkdirSync(outputPath, { recursive: true });
+  const outputDir = path.join(options.outputDir, "server-functions", name);
+  fs.mkdirSync(outputDir, { recursive: true });
 
   // Copy open-next.config.mjs
-  copyOpenNextConfig(options.buildDir, outputPath, true);
+  copyOpenNextConfig(options.buildDir, outputDir, true);
 
   // Load middleware manifest
-  const middlewareManifest = JSON.parse(
-    fs.readFileSync(
-      path.join(appBuildOutputPath, ".next/server/middleware-manifest.json"),
-      "utf8",
-    ),
-  ) as MiddlewareManifest;
+  const middlewareManifest = loadMiddlewareManifest(buildOutputDotNextDir);
 
   // Find functions
   const functions = Object.values(middlewareManifest.functions).filter((fn) =>
@@ -203,32 +200,28 @@ export async function generateEdgeBundle(
 
   //Copy wasm files
   const wasmFiles = middlewareInfo.wasm;
-  mkdirSync(path.join(outputPath, "wasm"), { recursive: true });
+  mkdirSync(path.join(outputDir, "wasm"), { recursive: true });
   for (const wasmFile of wasmFiles) {
     fs.copyFileSync(
-      path.join(appBuildOutputPath, ".next", wasmFile.filePath),
-      path.join(outputPath, `wasm/${wasmFile.name}.wasm`),
+      path.join(buildOutputDotNextDir, wasmFile.filePath),
+      path.join(outputDir, `wasm/${wasmFile.name}.wasm`),
     );
   }
 
   // Copy assets
   const assets = middlewareInfo.assets;
-  mkdirSync(path.join(outputPath, "assets"), { recursive: true });
+  mkdirSync(path.join(outputDir, "assets"), { recursive: true });
   for (const asset of assets) {
     fs.copyFileSync(
-      path.join(appBuildOutputPath, ".next", asset.filePath),
-      path.join(outputPath, `assets/${asset.name}`),
+      path.join(buildOutputDotNextDir, asset.filePath),
+      path.join(outputDir, `assets/${asset.name}`),
     );
   }
 
   await buildEdgeBundle({
     middlewareInfo,
-    entrypoint: path.join(
-      options.openNextDistDir,
-      "adapters",
-      "edge-adapter.js",
-    ),
-    outfile: path.join(outputPath, "index.mjs"),
+    entrypoint: path.join(options.openNextDistDir, "adapters/edge-adapter.js"),
+    outfile: path.join(outputDir, "index.mjs"),
     options,
     overrides: fnOptions.override,
     additionalExternals: options.config.edgeExternals,

packages/open-next/src/build/generateOutput.ts

@@ -1,7 +1,5 @@
 import * as fs from "node:fs";
 import path from "node:path";
-
-import type { NextConfig } from "types/next-types.js";
 import type {
   BaseOverride,
   DefaultOverrideOptions,
@@ -10,6 +8,7 @@ import type {
   OverrideOptions,
 } from "types/open-next";
 
+import { loadConfig } from "config/util.js";
 import { type BuildOptions, getBuildId } from "./helper.js";
 
 type BaseFunction = {
@@ -188,14 +187,8 @@ export async function generateOutput(options: BuildOptions) {
 
   const defaultOriginCanstream = await canStream(config.default);
 
-  //Load required-server-files.json
-  const requiredServerFiles = JSON.parse(
-    fs.readFileSync(
-      path.join(appBuildOutputPath, ".next", "required-server-files.json"),
-      "utf-8",
-    ),
-  ).config as NextConfig;
-  const prefixer = prefixPattern(requiredServerFiles.basePath ?? "");
+  const nextConfig = loadConfig(path.join(appBuildOutputPath, ".next"));
+  const prefixer = prefixPattern(nextConfig.basePath ?? "");
 
   // First add s3 origins and image optimization
 
@@ -206,9 +199,7 @@ export async function generateOutput(options: BuildOptions) {
       copy: [
         {
           from: ".open-next/assets",
-          to: requiredServerFiles.basePath
-            ? `_assets${requiredServerFiles.basePath}`
-            : "_assets",
+          to: nextConfig.basePath ? `_assets${nextConfig.basePath}` : "_assets",
           cached: true,
           versionedSubDir: prefixer("_next"),
         },