NX Monorepo support

[jarodsim]

I am running the command yarn open-next build --config-path ./apps/app01/open-next.config.ts, but I get the following error in the console:

node:fs:448
    return binding.readFileUtf8(path, stringToFlags(options.flag));
                   ^

Error: ENOENT: no such file or directory, open '/home/jarod/Documentos/development/FKW/aion/dist/apps/app01/.next/.open-next/.build/open-next.config.mjs'
    at readFileSync (node:fs:448:20)
    at initOutputDir (file:///home/jarod/Documentos/development/FKW/aion/node_modules/open-next/dist/build.js:138:28)
    at build (file:///home/jarod/Documentos/development/FKW/aion/node_modules/open-next/dist/build.js:43:5)
    at async file:///home/jarod/Documentos/development/FKW/aion/node_modules/open-next/dist/index.js:9:1 {
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/home/jarod/Documentos/development/FKW/aion/dist/apps/app01/.next/.open-next/.build/open-next.config.mjs'
}

Next itself builds normally.
My project is a monorepo with NX, Next.js, and open-next.

"dependencies": {
    "next": "14.2.3",
    "open-next": "^3.0.6",
    "react": "18.3.1",
    "react-dom": "18.3.1",
    "tslib": "^2.3.0"
  },

Content of the open-next.config.ts configuration file:
import type { OpenNextConfig } from 'open-next/types/open-next';

const config = {
  appPath: 'apps/app01',
  buildCommand: 'yarn nx build app01 --verbose',
  buildOutputPath: 'dist/apps/app01/.next',
  default: {},
} satisfies OpenNextConfig;

export default config;

The function initTempDir is creating the config file in the monorepo root:

Ok, analyzing the library, I noticed that in the function initOutputDir, it takes the tempDir from the options normalized by the normalizeOptions function. However, the problem is that it sets this tempDir as a folder already inside the build folder, whereas the initial tempDir created by the initTempDir function at the beginning of the build points to the root of the monorepo. This causes a break because the initOutputDir function expects this file and tempDir to exist inside the build folder, which they don't. At no point is this file moved to the build folder.

In summary, the folder .open-next/.build does not exist within the build files, which was to be expected.

I managed to build it after manually modifying the initOutputDir function in the library like this:

function initOutputDir(tempDir) {
    const { outputDir, tempDir: lTempDir } = options;
    const openNextConfig = readFileSync(path.join(tempDir, "open-next.config.mjs"), "utf8");
    let openNextConfigEdge = null;
    if (fs.existsSync(path.join(tempDir, "open-next.config.edge.mjs"))) {
        openNextConfigEdge = readFileSync(path.join(tempDir, "open-next.config.edge.mjs"), "utf8");
    }
    fs.rmSync(outputDir, { recursive: true, force: true });
    fs.mkdirSync(lTempDir, { recursive: true });
    fs.writeFileSync(path.join(lTempDir, "open-next.config.mjs"), openNextConfig);
    if (openNextConfigEdge) {
        fs.writeFileSync(path.join(tempDir, "open-next.config.edge.mjs"), openNextConfigEdge);
    }
}

In which the tempDir passed as a parameter is the tempDir created by the initTempDir function, which points to the root of the monorepo.

I wanted to know if there is any official solution :/

[conico974]

@jarodsim Someone has found another solution on discord https://discord.com/channels/983865673656705025/1177071497974648952/1245131486969987093
But your solution is probably the one we should use (as long as it doesn't break other stuff), would you mind creating a PR, with your solution ( and probably adding this to the docs as well )