Prerenderer don't follow symbolic link in assets folder

[iacore]

Describe the bug

If prerendered page reference assets through a symbolic link, then it will not be accessible on svelte-kit build.

Reproduction

https://github.com/locriacyber/debug-svelte-symbolic

Note:

• static/data is symbolic link to data
• The website works fine in yarn dev
• But it breaks with yarn build

Logs

> yarn build
yarn run v1.22.18
warning package.json: No license field
$ svelte-kit build
vite v2.9.5 building for production...
✓ 13 modules transformed.
.svelte-kit/output/client/_app/manifest.json                    1.14 KiB
.svelte-kit/output/client/_app/start-32c0b608.js                23.10 KiB / gzip: 8.67 KiB
.svelte-kit/output/client/_app/layout.svelte-23d0f029.js        0.53 KiB / gzip: 0.35 KiB
.svelte-kit/output/client/_app/error.svelte-bb9909e1.js         1.56 KiB / gzip: 0.74 KiB
.svelte-kit/output/client/_app/pages/index.svelte-8781c221.js   0.48 KiB / gzip: 0.33 KiB
.svelte-kit/output/client/_app/chunks/index-dd45c2ae.js         6.83 KiB / gzip: 2.79 KiB
vite v2.9.5 building SSR bundle for production...
✓ 11 modules transformed.
Generated an empty chunk: "hooks"
.svelte-kit/output/server/manifest.json                        1.09 KiB
.svelte-kit/output/server/index.js                             75.42 KiB
.svelte-kit/output/server/entries/fallbacks/layout.svelte.js   0.24 KiB
.svelte-kit/output/server/entries/fallbacks/error.svelte.js    0.72 KiB
.svelte-kit/output/server/entries/pages/index.svelte.js        0.28 KiB
.svelte-kit/output/server/chunks/index-2dc61825.js             2.29 KiB
.svelte-kit/output/server/chunks/hooks-1c45ba0b.js             0.00 KiB
> 404 /data/home.html (linked from /)

Severity

annoyance, workaround complicated

Workaround

Use the following file as hooks.ts

import type { Handle } from "@sveltejs/kit"
import * as fs from "fs/promises"
import * as path from "path"

// Workaround for https://github.com/sveltejs/kit/issues/4709
export const handle: Handle = async function({ event, resolve: res }) {
  if (event.url.pathname.startsWith("/data/")) {
    const relpath = event.url.pathname.slice("/data/".length)
    return new Response(await fs.readFile(path.join(await find_project_root(), "../data", relpath)))
  }

  const response = await res(event)
  return response
}

async function find_project_root(): Promise<string> {
    let patha = path.resolve(".")
    while (!(await fs.readdir(patha)).indexOf("package.json")) {
        const pathb = path.join(patha, "..")
        if (pathb == patha) throw Error("Cannot find project root")
        patha = pathb
    }
    return patha
}

[gaarf]

looks like https://github.com/sveltejs/kit/pull/5047/files#diff-ebeb4f305631dd30396a9451fc83ed439f1d111140fa32428efc6b75b89f7261R198 broke symbolic link in src/static for me