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fix: ignore EEXIST errors when symlinking traced files in adapter-vercel #16809

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fix: ignore EEXIST errors when symlinking traced files in adapter-vercel #16809

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5 changes: 5 additions & 0 deletions .changeset/vercel-symlink-eexist.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@sveltejs/adapter-vercel': patch
---

fix: ignore `EEXIST` errors when symlinking traced files that resolve to the same destination
8 changes: 7 additions & 1 deletion packages/adapter-vercel/index.js
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Expand Up @@ -601,7 +601,13 @@ async function create_function_bundle(builder, entry, dir, config) {

if (source !== realpath) {
const realdest = path.join(dir, path.relative(ancestor, realpath));
fs.symlinkSync(path.relative(path.dirname(dest), realdest), dest, is_dir ? 'dir' : 'file');
try {
fs.symlinkSync(path.relative(path.dirname(dest), realdest), dest, is_dir ? 'dir' : 'file');
} catch (error) {
// different traced paths can resolve to the same destination
// (e.g. multiple pnpm symlink chains pointing at the same real file)
if (/** @type {NodeJS.ErrnoException} */ (error).code !== 'EEXIST') throw error;
}
} else if (!is_dir) {
fs.copyFileSync(source, dest);
}
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