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presets(vercel): use reflinks for custom function dirs #4373

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Merged
pi0 merged 4 commits into from
Jun 30, 2026
Merged

presets(vercel): use reflinks for custom function dirs #4373

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d5bda43
presets(vercel): hard link custom function dirs instead of copying
RihanArfan Jun 23, 2026
b09051b
Merge branch 'main' into vercel-symlink-functions
RihanArfan Jun 29, 2026
3675810
Merge branch 'main' into vercel-symlink-functions
RihanArfan Jun 29, 2026
f54759d
refactor: simplify with copy on write
RihanArfan Jun 30, 2026
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13 changes: 7 additions & 6 deletions src/presets/vercel/utils.ts
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Original file line number Diff line number Diff line change
@@ -1,8 +1,9 @@
import fsp from "node:fs/promises";
import { constants } from "node:fs";
import { defu } from "defu";
import { writeFile } from "../_utils/fs.ts";
import type { Nitro, NitroRouteRules } from "nitro/types";
import { dirname, relative, resolve } from "pathe";
import { basename, dirname, relative, resolve } from "pathe";
import { Router } from "../../routing.ts";
import { joinURL, withLeadingSlash, withoutLeadingSlash } from "ufo";
import type {
Expand Down Expand Up @@ -636,11 +637,11 @@ async function createFunctionDirWithCustomConfig(
overrides: VercelServerlessFunctionConfig,
functionPath: string
) {
// Copy the entire server directory instead of symlinking individual
// entries. Vercel's build container preserves symlinks in the Lambda
// zip, but symlinks pointing outside the .func directory break at
// runtime because the target path doesn't exist on Lambda.
await fsp.cp(serverDir, funcDir, { recursive: true });
await fsp.cp(serverDir, funcDir, {
recursive: true,
mode: constants.COPYFILE_FICLONE,
filter: (src) => basename(src) !== ".vc-config.json",
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});
const mergedConfig = defu(overrides, baseFunctionConfig);
for (const [key, value] of Object.entries(overrides)) {
if (Array.isArray(value)) {
Expand Down
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