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Workaround for vercel/next.js#91661 — Next.js 16.2 omits .next/package.json from the required-server-files manifest, so Vercel's serverless functions don't get the CJS boundary marker. Without it, Node.js resolves the project's "type": "module" and treats the compiled server bundles as ESM, breaking require() calls at runtime. This adds a postbuild script that patches the manifest to include the file, matching the upstream fix in vercel/next.js#93612 (only in canary as of 16.2.6). The previous approach of removing "type": "module" broke the codegen step which uses tsx/esbuild and needs ESM for top-level await support. Co-Authored-By: Konstantin Wohlwend <n2d4xc@gmail.com>
37 lines
1.3 KiB
JavaScript
37 lines
1.3 KiB
JavaScript
/**
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* Workaround for https://github.com/vercel/next.js/issues/91661
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*
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* Next.js 16.2 doesn't include `.next/package.json` (the CJS boundary marker)
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* in the `required-server-files.json` manifest. Without it, Vercel's serverless
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* functions inherit `"type": "module"` from the project's package.json, causing
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* `require is not defined` at runtime.
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*
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* The upstream fix landed in vercel/next.js#93612 (canary only as of 16.2.6).
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* This script patches the manifest after `next build` to include the file.
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*
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* Remove this script once we upgrade to a stable Next.js release containing the fix.
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*/
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import { readFileSync, writeFileSync, existsSync } from 'fs';
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import { join } from 'path';
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const distDir = '.next';
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const manifestPath = join(distDir, 'required-server-files.json');
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if (!existsSync(manifestPath)) {
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// Not all build modes produce this manifest (e.g. compile-only docker builds)
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process.exit(0);
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}
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const manifest = JSON.parse(readFileSync(manifestPath, 'utf8'));
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const packageJsonEntry = join(distDir, 'package.json');
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if (!manifest.files.includes(packageJsonEntry)) {
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manifest.files.push(packageJsonEntry);
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writeFileSync(manifestPath, JSON.stringify(manifest));
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console.log(`Patched ${manifestPath}: added ${packageJsonEntry} to files array`);
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} else {
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console.log(`${manifestPath} already includes ${packageJsonEntry}, no patch needed`);
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}
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