nx.js

import fs from 'node:fs';
import path from 'node:path';

// Nx internals are shipped with nx; these imports work inside an Nx workspace.
import { createProjectGraphAsync } from 'nx/src/project-graph/project-graph';
import { readNxJson } from 'nx/src/config/configuration';
import { ReleaseClient } from 'nx/src/command-line/release';

const OUT_PATH = '.nx-release/version-data.json';

function ensureDir(p) {
  fs.mkdirSync(p, { recursive: true });
}

const nxJson = readNxJson();
const releaseConfig = nxJson.release ?? {};

// Important: ignoreNxJsonConfig=false means it will merge with nx.json release config.
// We'll pass {} here and let it use nx.json as source of truth.
const client = new ReleaseClient({}, false);

const projectGraph = await createProjectGraphAsync({ exitOnError: true });

// Compute versions without writing/changing anything
const res = await client.releaseVersion({
  dryRun: true,
  verbose: false,
  // This must match how you version in PR; if you rely on version plans, keep specifier undefined
  // so it resolves version plans.
  // You can also pass filters here if needed:
  // projects: [...],
  // groups: [...],
});

// The shape of `res` includes versioning info; we want a normalized `{[projectName]: {newVersion}}`
// Depending on Nx versions, it might be `res.projectsVersionData` or similar.
// If this fails, log res once and adjust mapping (only once).
const versionData =
  res.projectsVersionData ??
  res.versionData ??
  res.projectVersionData ??
  null;

if (!versionData) {
  throw new Error(
    `Could not find versionData in releaseVersion() result. Keys: ${Object.keys(
      res ?? {}
    ).join(', ')}`
  );
}

const projectsOut = {};
for (const [projectName, v] of Object.entries(versionData)) {
  const node = projectGraph.nodes[projectName];
  const projectRoot = node?.data?.root;
  projectsOut[projectName] = {
    projectRoot,
    newVersion: v?.newVersion ?? null,
  };
}

ensureDir(path.dirname(OUT_PATH));
fs.writeFileSync(
  OUT_PATH,
  JSON.stringify(
    {
      generatedAt: new Date().toISOString(),
      projects: projectsOut,
    },
    null,
    2
  ) + '\n',
  'utf8'
);

console.log(`Wrote ${OUT_PATH}`);