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fix: prevent O(n²) memory allocation in content lookup map generation #14973

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Merged
matthewp merged 2 commits into from
Dec 9, 2025
Merged

fix: prevent O(n²) memory allocation in content lookup map generation #14973

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f076977
refactor: simplify lookup map entry assignment logic
ixchio Dec 6, 2025
b90634a
chore: add changeset for lookup map OOM fix
ixchio Dec 6, 2025
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5 changes: 5 additions & 0 deletions .changeset/fix-lookup-map-oom.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"astro": patch
---

Fixes performance regression and OOM errors when building medium-sized blogs with many content entries. Replaced O(n²) object spread pattern with direct mutation in `generateLookupMap`.
18 changes: 4 additions & 14 deletions packages/astro/src/content/vite-plugin-content-virtual-mod.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -355,22 +355,12 @@ async function generateLookupMap({ settings, fs }: { settings: AstroSettings; fs
: undefined,
});
}
lookupMap[collection] = {
type: 'content',
entries: {
...lookupMap[collection]?.entries,
[slug]: rootRelativePath(root, filePath),
},
};
lookupMap[collection] ??= { type: 'content', entries: {} };
lookupMap[collection].entries[slug] = rootRelativePath(root, filePath);
} else {
const id = getDataEntryId({ entry: pathToFileURL(filePath), contentDir, collection });
lookupMap[collection] = {
type: 'data',
entries: {
...lookupMap[collection]?.entries,
[id]: rootRelativePath(root, filePath),
},
};
lookupMap[collection] ??= { type: 'data', entries: {} };
lookupMap[collection].entries[id] = rootRelativePath(root, filePath);
}
}),
);
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